Howard E. Haber

Howard Haber
Office	ISB 326
Phone	1-831-459-4228
FAX	1-831-459-5265
Address	Department of Physics University of California 1156 High Street Santa Cruz, CA 95064 USA
Office Hours	Mondays 3--4 pm, and Thursdays 2--3 pm
e-mail	haber@scipp.ucsc.edu
alternate e-mail	haber@ucsc.edu

This is the professional website of Howard Haber, Distinguished Professor of Physics at the University of California, Santa Cruz.

RECENT NEWS

December 3, 2024: My paper in collaboration with Sumit Banik, Guglielmo Coloretti, and Andreas Crivellin, entitled Correlating EDMs and A→γγ in the 2HDM in light of the diphoton excesses at 95 GeV and 152 GeV, was posted on the arXiv. A link to this paper can be found in Section II of this website.

The correlations of Higgs decays to photons with electric dipole moments (EDMs) in the CP-violating flavor-aligned two-Higgs-doublet model (2HDM) are examined. In the approximate alignment limit of the 2HDM (favored by the LHC Higgs data), the neutral scalar spectrum consists of a Standard Model (SM)-like Higgs boson and two approximate eigenstates of CP (denoted by the CP-even H and the CP-odd A). Nevertheless, CP-violating effects in the scalar self-couplings may be present such as a coupling of A to a pair of charged scalars H⁺H^-, which can yield (via a loop-induced process) a sizable branching ratio for A→γγ. These CP-violating effects also generate non-zero EDMs for the electron, the neutron and the proton. We examine these correlations for the cases of m_A=95 GeV and m_A=152 GeV where interesting excesses in the diphoton spectrum have been observed at the LHC. These excesses can be explained via the decay of A while being consistent with the experimental bound for the electron EDM in regions of parameter space that can be tested with future neutron and proton EDM measurements.

October 25, 2024: My talk entitled Flavor-nondiagonal neutral Higgs Yukawa couplings revisited, given at the Extended Scalar Sectors From All Angles workshop at CERN, has been posted to Section VII of this website.

September 4, 2024: My paper entitled Explicit form for the most general Lorentz transformation revisited was published in the journal Symmetry. A link to this paper can be found in Section II of this website.

Explicit formuale for the 4x4 Lorentz transformation matrices corresponding to a pure boost and a pure three-dimensional rotation are very well-known. Significantly less well-known is the explicit formula for a general Lorentz transformation with arbitrary boost and rotation parameters. We revisit this more general formula by presenting two different derivations, which are shown to yield the same result. The first derivation evaluates the exponential of a 4x4 matrix by making use of the Lagrange interpolating polynomial. The second derivation exploits the assertion that for two-component spinors η and χ, the spinor product ησ^μχ^† is a Lorentz four-vector. As a result, the formula for a general Lorentz transformation reduces to the computation of the trace of a product of 2x2 matrices.

September 3, 2024: My talk entitled Flavor-nondiagonal neutral Higgs Yukawa couplings revisited, given at the 2024 Workshop on Multi-Higgs Models in Lisbon, Portugal, at the Instituto Superior Técnico, has been posted to Section VII of this website.

August 1, 2024: The 2024 edition of the Review of Particle Physics, published today in Physical Review D, provides a comprehensive review of the field of particle physics and of related areas in cosmology. Topics include Higgs bosons, supersymmetry, big bang nucleosynthesis, probability, statistics, and accelerators and detectors. The latest update of my Supersymmetry Theory review in collaboration with Ben Allanach, which appears in the Review of Particle Physics, can be found in Section III of this website.

June 10, 2024: My talk entitled Classes of complete dark photon models constrained by Z Physics, given at the 31st International Conference on Supersymmetry and Unification of Fundamental Interactions: Theory meets Experiment (SUSY 2024), has been posted to Section VII of this website.

June 5, 2024: My talk entitled Flavor-nondiagonal neutral Higgs Yukawa couplings revisited, given at PLANCK 2024: 26th International Conference from the Planck Scale to the Electroweak Scale, has been posted to Section VII of this website.

May 1, 2024: My talk entitled Classes of complete dark photon models constrained by Z Physics, given at the CATCH22+2 International Conference at the Dublin Institute for Advanced Studies in Dublin, Ireland, has been posted to Section VII of this website.

March 12, 2024: My presentation to Physics 205 can be found in Section V of this website.

March 1, 2024: Some notes entitled Acceleration and Force in Special Relativity, which include a treatment of the instantaneous rest frame of an accelerating particle, have been posted to Section VI of this website.

February 28, 2024: A pedagogical presentation of the Thomas precession and the celebrated BMT equation has been posted to Section VI of this website.

February 25, 2024: Some notes on the origin of vector spherical harmonics entitled The tensor spherical harmonics, which employs the formalism of addition of angular momentum in quantum mechanics, has been posted to Section VI of this website. In the ﬁnal section of these notes, the application of vector spherical harmonics to the electromagnetic multipole radiation ﬁelds is exhibited.

February 19, 2024: I could not find in the literature closed-form expressions for the two-loop Barr-Zee diagram integrals. So, I went ahead and derived these results, which can be expressed in terms of dilogarithms or the Clausen function (depending on the value of a parameter). A short note presenting the derivation, entitled Evaluating integrals arising from Barr-Zee diagrams, has been posted to Section VI of this website.

February 13, 2024: Today, my paper in collaboration with Miguel Bento and Joao Silva, entitled Classes of complete dark photon models constrained by Z-physics, was published in Physics Letters B. A link to this paper can be found in Section II of this website.

Dark Matter models that employ a vector portal to a dark sector are usually treated as an effective theory that incorporates kinetic mixing of the photon with a new U(1) gauge boson, with the Z boson integrated out. However, a more complete theory must employ the full SU(2)_L×U(1)_Y×U(1)_Y' gauge group, in which kinetic mixing of the Z boson with the new U(1) gauge boson is taken into account. The importance of the more complete analysis is demonstrated by an example where the parameter space of the effective theory that yields the observed dark matter relic density is in conflict with a suitably defined electroweak ρ parameter that is deduced from a global fit to Z physics data.

January 9, 2024: The 2023 update of the Supersymmetry (Theory) review that appears in the Review of Particle Physics by the Particle Data Group (PDG) was published online on December 1, 2023 (see news item below). To make it widely accessuble, this review was posted on the arXiv today. A link to the arXiv version of this review can be found in Section II of this website.

December 29, 2023: The 2024 Particle Physics conference schedule has been posted to Section VIII of this website. Although not intended to be comprehensive, it covers many conferences that overlap with my research interests.

Listings of older news items are stored here.

I. Research

The basic themes underlying my research program involve the study of: (i) the dynamics responsible for electroweak symmetry breaking; (ii) the theory and phenomenology of Higgs bosons; (iii) TeV-scale supersymmetry as a framework for incorporating a weakly-coupled Higgs sector; (iv) the phenomenology of signals for new physics beyond the Standard Model at the Large Hadron Collider (LHC) and future colliders; and (v) connections of low-energy phenomena with fundamental scales that lie beyond the TeV scale (e.g. lepton number violation and implications for neutrino masses).

After more then ten years after the discovery of the Higgs boson in 2012 at the Large Hadron Collider (LHC), many properties of this spin-zero particle have been measured. These results have profound implications for the dynamics of electroweak symmetry breaking and the possible structure of new physics that may lie beyond the Standard Model (SM) of particle physics. For example, most approaches to physics beyond the SM include extended Higgs sectors. Present Higgs data suggest that the properties of one of the scalars of the Higgs sector (identified with the observed Higgs boson) must have properties that closely approximate that of the SM Higgs boson. This constraint in turn imposes important constraints on any SM extension. The two-Higgs doublet model (2HDM) is a convenient theoretical laboratory for the study of extended Higgs sectors. Indeed, the two doublet extended Higgs sector is a key component of the simplest supersymmetric extension of the SM.

The theoretical structure and phenomenological profile of the 2HDM has attracted much attention in recent years. Staring with a seminal paper in collaboration with Sacha Davidson published in 2005, my work has advocated the importance of a basis-independent treatment of the 2HDM. During the past few years, I have focused on the relevance of the so-called decoupling and alignment limits of the 2HDM in which one of scalars closely resembles the SM Higgs boson. The basis-independent technology provides a very powerful and simple framework for studying and interpreting these limits.

If new physics beyond the SM emerges at the LHC, it will be essential to develop techniques for measuring new particle interaction strengths at high energy colliders. By detecting relations among various independent couplings, one can ascertain underlying symmetries and distinguish among different theoretical interpretations of the new physics. For example, with sufficient precision, it will be possible to provide convincing evidence for or against a supersymmetric interpretation of new fundamental physics phenomena. A precision Higgs program at the LHC and at a future collider (such as the proposed International Linear Collider) can also provide important clues as to what may lie beyond the Standard Model.

II. Publications

All my profession publications can be found here on the INSPIRE HEP database.

Most of my professional publications since 1992 are stored on the e-print archive hosted by arXiv.org. PDF and Postscript versions of the stored papers can be found here. My top cited publications according to Google Scholar can be found here.

Links to Conference proceedings, 2013--2022:

A natural mechanism for a SM-like Higgs boson in the 2HDM without decoupling
Howard E. Haber. May 17, 2022. 15 pp.
Invited talk at DISCRETE 2020-2021: 7th Symposium on Prospects in the Physics of Discrete Symmetries, November 29--December 3, 2021
Published in PoS(DISCRETE2020-2021)010
Published version: [PDF]
e-Print: arXiv:2205.07578 [hep-ph] | PDF
Detailed record - Cited by 3 records
Approximate Higgs alignment without decoupling
Howard E. Haber. May 15, 2018. 4 pp.
SCIPP 18/03.
Contribution to the Proceedings of the 53th Rencontres de Moriond, QCD Session, 17--24 March 2018
e-Print: arXiv:1805.05754 [hep-ph] | PDF
Detailed record - Cited by 6 records
Future Higgs Studies: A Theorist's Outlook
Howard E. Haber. Jan 8, 2017. 12 pp.
Invited talk at Charged 2016: Prospects for Charged Higgs Discovery at Colliders, 3--6 October 2016
Published in PoS(CHARGED2016)029
Published version: [PDF]
e-Print: arXiv:1701.01922 [hep-ph] | PDF
Detailed record - Cited by 5 records
The Higgs data and the Decoupling Limit
Howard E. Haber. Dec 31, 2013. 15 pp.
SCIPP-13-15.
Published in the Proceedings of the Toyama International Workshop on Higgs as a Probe of New Physics 2013 (HPNP2013) on eConf
e-Print: arXiv:1401.0152 [hep-ph] | PDF
Detailed record - Cited by 62 records

Articles on the Higgs boson meant for a broader audience can be found below.

Higgs Boson Physics -- The View Ahead
Howard E. Haber (UC, Santa Cruz). Oct 4, 2022. 8 pp.
Published in the September 2022 issue of the CERN EP Newsletter of the EP department
URL: https://ep-news.web.cern.ch/content/higgs-boson-physics-view-ahead

Viewpoint: Higgs Decay into Bottom Quarks Seen at Last
Howard E. Haber (UC, Santa Cruz). Sept 2018.
Published in Physics 11 (2018) 91
DOI: 10.1103/Physics.11.91
Published version: [PDF]

Viewpoint: Homing in on the Higgs Boson
Howard E. Haber (UC, Santa Cruz). Mar 2012.
Published in Physics 5 (2012) 32
DOI: 10.1103/Physics.5.32
Published version: [PDF]
References | BibTeX | LaTeX(US) | LaTeX(EU) | Harvmac | EndNote
Journal Server - Physics

Detailed record

The Higgs boson explained in 60 seconds
Howard E. Haber (UC, Santa Cruz). Aug. 2006.
Published in Symmetry Magazine, volume 3, issue 6 (August, 2006)
URL: https://www.symmetrymagazine.org/article/august-2006/60-seconds-higgs-boson
Published version: [PDF]

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III. Published Reviews

Supersymmetry, Part I (Theory).
Benjamin C. Allanach (Cambridge U., DAMTP), Howard E. Haber (UC, Santa Cruz). Aug. 2023. 53 pp.
Review of Particle Physics (RPP)
Particle Data Group Collaboration (S. Navas et al.). August 2024. 2382 pp.
Published in Phys. Rev. D 110, 030001 (2024)
DOI: doi.org/10.1103/PhysRevD.110.030001
Published version: [PDF]
Particle Data Group (PDG) webpage: [HTML]
Detailed record - Cited by 534 records

Higgs-mass predictions in the MSSM and beyond
P. Slavich, S. Heinemeyer, E. Bagnaschi, H. Bahl, M. Goodsell, H.E. Haber, et al. Dec 31, 2020. 83 pp.
DESY 20-229, DESY-20-229, IFT-UAM/CSIC-20-184, FR-PHENO-2020-021, KA-TP-23-2020, MPP-2020-235, KA-TP-23-2020, MPP-2020-235, P3H-20-086, TTK-20-53
Published in Eur.Phys.J. C81 (2021) 450
DOI: 10.1140/epjc/s10052-021-09198-2
Published version: [PDF]
e-Print: arXiv:2012.15629 [hep-ph] | PDF
Detailed record - Cited by 98 records

Supersymmetric Theory and Models
Howard E. Haber, Laurel Stephenson Haskins. Dec 16, 2017. 144 pp.
SCIPP-17-11
Conference: C16-06-06.15, pp. 355--499 Proceedings
Published in Chapter 6 of TASI 2016: Anticipating the Next Discoveries in Particle Physics, edited by Rouven Essig and Ian Low (World Scientific, Singapore, 2018).
DOI: 10.1142/9789813233348_0006
e-Print: arXiv:1712.05926 [hep-ph] | PDF
Detailed record - Cited by 24 records

ILC Higgs White Paper
D.M. Asner, T. Barklow, C. Calancha, K. Fujii, N. Graf, H.E. Haber, A. Ishikawa, S. Kanemura, S. Kawada, M. Kurata et al.. Oct 23, 2013. 152 pp.
e-Print: arXiv:1310.0763 [hep-ph] | PDF
Detailed record - Cited by 406 records

Geometric picture of generalized-CP and Higgs-family transformations in the two-Higgs-doublet model.
P.M. Ferreira (Lisbon, ISEL & Lisbon, IST), Howard E. Haber (UC, Santa Cruz), M. Maniatis (Heidelberg U.), O. Nachtmann (Heidelberg U.), Joao P. Silva (Lisbon, ISEL & Lisbon, IST). Oct 2010. 31 pp.
SCIPP-10-15, HD-THEP-10-1.
Published in Int.J.Mod.Phys. A26 (2011) 769-808
DOI: 10.1142/S0217751X11051494
Published version: [PDF]
e-Print: arXiv:1010.0935 [hep-ph]
Detailed record - Cited by 62 records

Two-component spinor techniques and Feynman rules for quantum field theory and supersymmetry.
Herbi K. Dreiner, Howard E. Haber, Stephen P. Martin. Dec 2008. 246 pp.
BN-TH-2008-12, SCIPP-08-08.
Published in Phys.Rept. 494 (2010) 1-196
DOI: 10.1016/j.physrep.2010.05.002
Published version: [PDF]
Corrected version of the published review with a few enhancements, with the mostly minus metric [PDF]
Corrected version of the published review with a few enhancements, with the mostly plus metric [PDF]
e-Print: arXiv:0812.1594 [hep-ph]
Detailed record - Cited by 581 records

Webpage for Two-component spinor techniques and Feynman rules for quantum field theory and supersymmetry, maintained by Stephen P. Martin. Both the arXiv version and the Physics Reports version use the spacetime metric signature (+1,-1,-1,-1), as is found for example in the field theory textbooks by Ramond, and by Peskin and Schroeder . However, many people including one of the authors (S.P. Martin) prefer the metric signature (-1, +1, +1, +1), as is found for example in the textbooks by Weinberg, by Wess and Bagger, by Srednicki, and in Martin's Supersymmetry Primer. Here is a PDF file of v6 of our review with the (-1, +1, +1, +1) metric convention, which should be identical in content in every other respect: DHMspinors_v6.pdf.

Both the (+1,-1,-1,-1) and the (-1, +1, +1, +1) metric versions were made from the same source files available from the arXiv. The choice of metric signature is implemented by simply changing a single character in the main LaTeX source file, namely the argument of line 20, with \def\signofmetric{0} corresponding to the (+1,-1,-1,-1) metric and \def\signofmetric{1} to the (-1, +1, +1, +1) metric. Note that the pdf file is produced with pdflatex.

The list of known corrections to the Physics Reports version as of May 2022 is here: DHM_corr_PhysicsReports.pdf.

These corrections have all been implemented (along with some additional enhancements) and can be found in version 6 of arXiv:0812.1594 (313 pages, May 2022). Any subsequent corrections to version 6 of arXiv:0812.1594 will be posted on https://www.niu.edu/spmartin/spinors/.

Higgs boson theory and phenomenology.
Marcela Carena (Fermilab), Howard E. Haber (UC, Santa Cruz). Aug 2002. 87 pp.
hep-ph/0208209,FERMILAB-PUB-02-114-T, SCIPP-02-07.
Published in Prog.Part.Nucl.Phys. 50 (2003) 63-152
DOI: 10.1016/S0146-6410(02)00177-1
Published version: [PDF]
e-Print: hep-ph/0208209
Detailed record - Cited by 600 records

Spin formalism and applications to new physics searches.
Howard E. Haber (UC, Santa Cruz & Santa Barbara, KITP). Apr 1994. 83 pp.
hep-ph/9405376, SCIPP-93-49, NSF-ITP-94-30, C93-07-26.
Published in Stanford 1993, Spin structure in high energy processes, pp. 231-272
Presented at Conference: C93-07-26
e-Print: hep-ph/9405376
Postscript and PDF from this website.

Detailed record - Cited by 141 records

Lectures on electroweak symmetry breaking.
Howard E. Haber (UC, Santa Cruz). Mar 1991. 136 pp.
SCIPP-91-06
Invited lectures given at Conference: C90-06-03 (Boulder TASI 90:340-475), p.340-475
PDF from this website.

Detailed record - Cited by 1 record

The Search for Supersymmetry: Probing Physics Beyond the Standard Model.
Howard E. Haber (UC, Santa Cruz & SLAC), Gordon L. Kane (Michigan U.). Jan 1984. 376 pp.
UM-HE-TH-83-17, SCIPP-85-47.
Published in Phys.Rept. 117 (1985) 75-263
DOI: 10.1016/0370-1573(85)90051-1
Published version: [PDF] [Erratum]
Detailed record - Cited by 5498 records

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IV. Published Books

Co-authored books

From Spinors to Supersymmetry.
Herbi K. Dreiner, Howard E. Haber, Stephen P. Martin. Jun 2023. 1009 pp.
Detailed record - Cited by 7 records

Cited by 20 Google Scholar records

Links to From Spinors to Supersymmetry at the Cambridge University Press webpage: [Overview | Hardback | eBook]

Link to Resources and Errata

The book can also be purchased from Amazon via the following link.

The Higgs Hunter's Guide.
John F. Gunion (UC, Davis), Howard E. Haber (UC, Santa Cruz), Gordon L. Kane (Michigan U.), Sally Dawson (Brookhaven). Jun 1989. 404 pp.
SCIPP-89/13, UCD-89-4, BNL-41644.
Published in Front. Phys. 80 (2000) 1-448
Detailed record - Cited by 1297 records

Cited by 5024 Google Scholar records

Link to The Higgs Hunter's Guide at the Perseus Books webpage. See also the Routledge (member of Taylor & Francis Group) webpage.

Errata for The Higgs hunter's guide.
John F. Gunion (UC, Davis), Howard E. Haber (UC, Santa Cruz), Gordon L. Kane (Michigan U.), Sally Dawson (Brookhaven). Dec 1992. 5 pp.
hep-ph/9302272, SCIPP-92-58.
e-Print: hep-ph/9302272

Detailed record - Cited by 189 records TopCite

Edited books

Particle physics and cosmology: The quest for physics beyond the standard model(s). Proceedings, Theoretical Advanced Study Institute, TASI 2002, Boulder, USA, June 3-28, 2002.
H.E. Haber, (ed.) (UC, Santa Cruz), A.E. Nelson, (ed.) (Washington U., Seattle). 2004. 892 pp.
ISBN-9789812388926.
Prepared for Conference: C02-06-02.1 (River Edge, USA: World Scientific (2004) 892 p)
Detailed record - Cited by 2 records

Link to Particle Physics and Cosmology webpage at World Scientific Publishing.

Electroweak symmetry breaking and new physics at the TeV scale.
T.L. Barklow, (ed.) (SLAC), S. Dawson, (ed.) (Brookhaven), H.E. Haber, (ed.) (UC, Santa Cruz), J.L. Siegrist, (ed.) (LBL, Berkeley). 1996.
Published in Singapore, Singapore: World Scientific (1996) 736 p. (Advanced series on directions in high energy physics. 16)
Detailed record - Cited by 3 records

Link to Electroweak Symmetry Breaking and New Physics at the TeV Scale webpage at World Scientific Publishing.

From The Planck Scale To The Weak Scale: Toward A Theory Of The Universe. Proceedings, Theoretical Advanced Study Institute In Elementary Particle Physics, Santa Cruz, Usa, June 23 - July 18, 1986. Vol. 2.
H.E. Haber, (Ed.). 1987.
Published in SINGAPORE, SINGAPORE: WORLD SCIENTIFIC (1987) 497-953
Detailed record

Link to From the Planck Scale to the Weak Scale: Toward a Theory of the Universe webpage at World Scientific Publishing.

From The Planck Scale To The Weak Scale: Toward A Theory Of The Universe. Proceedings, Theoretical Advanced Study Institute In Elementary Particle Physics, Santa Cruz, Usa, June 23 - July 18, 1986. Vol. 1.
H.E. Haber, (Ed.). 1987.
Published in SINGAPORE, SINGAPORE: WORLD SCIENTIFIC (1987) 1-495
Detailed record

Link to From the Planck Scale to the Weak Scale: Toward a Theory of the Universe webpage at World Scientific Publishing.

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V. Teaching

Winter, 2024 Physics 214 Electromagnetism II
Winter, 2024 Physics 205 Introduction to Research "Research on the Theory of the Terascale" [PDF | Powerpoint]
Spring, 2023 Physics 251 Group Theory and Modern Physics
Spring, 2020 Physics 222 Quantum Field Theory III
Fall, 2019 Physics 116A Mathematical Methods in Physics I
Winter, 2018 Physics 215 Introduction to Non-Relativistic Quantum Mechanics
Fall 2016 Physics 217 Quantum Field Theory I
Winter 2016 Physics 218 Quantum Field Theory II
Fall, 2015 Physics 171 General Relativity, Black Holes, and Cosmology
Fall, 2012 Physics 116C Mathematical Methods in Physics III
Spring, 2012 Physics 216 Advanced Topics in Non-Relativistic Quantum Mechanics
Fall, 2009 Physics 139B Quantum Mechanics II
Winter, 2009 Physics 5B Introduction to Physics II
Winter, 2000 Physics 112 Thermodynamics and Statistical Mechanics

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VI. Notes and other writings

Acceleration and Force in Special Relativity [PDF | PS]
Thomas Precession and the BMT equation [PDF | PS]
The tensor spherical harmonics [PDF | PS]
Evaluating integrals arising from Barr-Zee diagrams [PDF | PS]
Exponentiating the Lie algebra of the Lorentz group [PDF | PS]
Rational approximations to ln 2 short version: [PDF | PS]; long version: [PDF | PS]
Generalized Functions for Physics [PDF | PS]
Evaluating the finite part of the Passarino-Veltman function B₀(p²;m₁²,m₂²) [PDF | PS]
Evaluating the one-loop function arising in h→γγ [PDF | PS]
Analytic formulae for the Feynman propagator in coordinate space [PDF | PS]
A Tale of Three Diagonalizations [PDF | PS]
Notes on the Matrix Exponential and Logarithm [PDF | PS]
The characteristic polynomial [PDF | PS]
What is the group of conjugate symplectic matrices? [PDF | PS]
Parameterization of real orthogonal antisymmetric matrices [PDF | PS]
Toward a set of 2HDM benchmarks [PDF | PS]
The eigenvalues of the quadratic Casimir operator and second-order indices of a simple Lie algebra [PDF | PS]
Notes on basis changes and matrix diagonalization [PDF | PS]
Notes on the complex inverse trigonometric and hyperbolic functions and their principal values [PDF | PS]
Electron wave function and mass renormalization in QED [PDF | PS]
Proof of a trace inequality in matrix algebra [PDF | PS]
Notes on the spontaneous breaking of SU(N) and SO(N) via a second-rank tensor multiplet [PDF | PS]
Notes on antisymmetric matrices and the pfaffian [PDF | PS]
Complex representation of scalar fields and the embedding of U(n) in SO(2n) [PDF | PS]
The probability that a product of random numbers is less than a fixed constant [PDF | PS]
Massless Majorana and Weyl fermions cannot be distinguished [PDF | PS]

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VII. Talks at conferences, workshops and schools, 2004--2024

2024 Conferences and workshops

Cosmology, Astrophysics, Theory and Collider Higgs 2024 (CATCH22+2), at the Dublin Institute for Advanced Study (DIAS), in Dublin, Ireland, May 1, 2024 Classes of complete dark photon models constrained by Z Physics [PDF]

PLANCK 2024: 26th International Conference from the Planck Scale to the Electroweak Scale, In Lisbon, Portugal, June 5, 2024 Flavor-nondiagonal neutral Higgs Yukawa couplings revisited [PDF]

31st International Conference on Supersymmetry and Unification of Fundamental Interactions: Theory meets Experiment (SUSY 2024), in Madrid, Spain, June 10, 2024 Classes of complete dark photon models constrained by Z Physics [PDF]

2024 Workshop on Multi-Higgs Models, at the Instituto Superior Técnico in Lisbon, Portugal, September 3, 2024 Flavor-nondiagonal neutral Higgs Yukawa couplings revisited [PDF]

Extended scalar sectors from all angles, at CERN in Geneva, Switzerland, October 25, 2024 Flavor-nondiagonal neutral Higgs Yukawa couplings revisited [PDF]

2023 Conferences and workshops

"Herbi Fest"--Pursuing Physics Beyond the Standard Model: a symposium in honor of Herbi Dreiner on the occasion of his 60th birthday, at the Bethe Center for Theoretical Physics, University of Bonn, in Bonn, Germany, March 28, 2023 Adventures from spinors to SUSY [PDF]

International Workshop on Future Linear Colliders (LCWS2023), at SLAC National Accelerator Laboratory in Menlo Park, CA USA, May 17, 2023 P-even, CP-violating Signals in Scalar-Mediated Processes [PDF]

PLANCK 2023: 25th International Conference from the Planck Scale to the Electroweak Scale, at the University of Warsaw in Warsaw, Poland, May 22, 2023 Higgs Boson Physics—The View Ahead [PDF]

Beyond the SM from Colliders to the Early Universe: a symposium in honor of Marcela Carena and Carlos Wagner on the occasion of their 60th birthdays, at the University of Chicago in Chicago, IL USA and at Fermilab in Batavia, IL USA, May 28, 2023 My Journey through Physics with Marcela and Carlos [PDF]

The 6th International Workshop on "Higgs as a Probe of New Physics" (HPNP2023), at Osaka University, in Osaka, Japan, June 5, 2023 Signals of new heavy scalars in the flavor-aligned 2HDM [PDF]

pre-SUSY school 2023, at the University of Southampton, in Southampton, England, July 13, 2023 Supersymmetry and Higgs Physics [PDF]

The XXX International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2023), at the University of Southampton, in Southampton, England, July 21, 2023 Supersymmetry Confronts a SM-Like Higgs Boson [PDF]

Higgs Days at Santander 2023, in Santander, Spain, September 6, 2023 Signals of new heavy scalars in the flavor-aligned 2HDM [PDF]

Scalars 2023, at the University of Warsaw in Warsaw, Poland, September 13, 2023 Scalar revelations at future e⁺e^- colliders [PDF]

2022 Conferences and workshops

The XXIX International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2022), at the University of Ioannina in Ioannina, Greece, June 29, 2022 The anapole moment of a charged lepton in softly-broken Supersymmetric QED [PDF]

Workshop on Multi-Higgs Models , at the Instituto Superior Técnico in Lisbon, Portugal, August 30, 2022 P-even, CP-violating Signals in Scalar-Mediated Processes [PDF]

IDT-WG3-Phys Open Meeting, online via zoom, November 17, 2022 P-even, CP-violating Signals in Scalar-Mediated Processes [PDF]

2021 Conferences and workshops

The 5th International Workshop on "Higgs as a Probe of New Physics Special Edition 2021" (HPNP2021), in Osaka, Japan (held online), March 27, 2021 Exceptional regions of the 2HDM parameter space [PDF]

49th SLAC Summer Institute (SSI 2021), at SLAC, Stanford, CA USA (held online), August 27, 2021 Higgs Boson Physics—The View Ahead [PDF]

Charged Higgs Online Workshop, August 30, 2021 Extended Higgs sector at present and future colliders [PDF]

DISCRETE 2020-2021, December 3, 2021 A natural mechanism for a SM-like Higgs boson in the 2HDM without decoupling [PDF]

Professional talks at conferences and workshops in previous years are stored here.

Schools and Pedagogical Lectures

pre-SUSY school 2023, at the University of Southampton, in Southampton, England, July 13, 2023 Supersymmetry and Higgs Physics [PDF]

49th SLAC Summer Institute (SSI 2021), at SLAC, Stanford, CA USA (held online), August 27, 2021 Higgs Boson Physics—The View Ahead [PDF]

Sorak Symposium reminiscence on Particle Physics, at NakSan Beach Hotel in Yang Yang, South Korea, August 15, 2019 The incomplete and biased history of the Higgsboson [PDF]

Sorak Symposium reminiscence on Particle Physics, at NakSan Beach Hotel in Yang Yang, South Korea, August 15, 2019 Quo Vadis Higgs (or what the current Higgs data is trying to tell us) [PDF]

The 46th SLAC Summer Institute--Standard Model at 50: Successes and Challenges, at SLAC in Stanford, CA USA, August 6, 2018 The woefully incomplete, unabashedly biased history of the Higgs Boson [PDF]

Pre-SUSY 2016, preceding the 24th International Conference on Supersymmetry and Unification of Fundamental Interactions, Melbourne, Australia, 27 June--July 8, 2016 SM and SUSY Higgs [Lecture 1 | Lecture 2 | Lecture 3]

2016 Theoretical Advanced Study Institute (TASI 2016), 6 June--1 July 2016, Supersymmetric Theories and Models [Lecture 1 | Lecture 2 | Lecture 3 | Lecture 4]

The 40th SLAC Summer Institute, The Electroweak Scale: Unraveling the Mysteries at the LHC, 23 July--3 August 2012, Electroweak Symmetry Breaking (EWSB): The Basics [Lecture 1 | Lecture 2]

Idpasc Higgs School, Foz do Arelho, Portugal, 6--9 Sept 2011, Theory of Higgs Bosons: The Standard Model and Beyond [PDF]

The Pre SUSY school, preceding the 18th International Conference on Supersymmetry and Unification of Fundamental Interactions, Bonn, Germany, 19--21 August, 2010, Two-component Spinor Formalism: practical methods for treating Majorana fermions [PDF]

Spaatind 2010: Nordic Conference in Particle Physics Spaatind 2010, Spaatind, Norway, 2--8 January 2010, Introduction to Electroweak Symmetry Breaking [PDF]; Two-component spinor formalism [PDF]

Collider Phenomenology, DESY Theory Workshop, DESY Hamburg, Germany, 29 September--1 October 2009 Introduction to Electroweak Symmetry Breaking [PDF]

The CERN--Fermilab 2008 Hadron Collider Physics Summer School, Fermilab, August 12--22, 2008, Higgs Boson Theory and Phenomenology [PDF]

Pre-SUSY 2005, preceding the 13th International Conference on Supersymmetry and Unification of Fundamental Interactions, IPPP Durham, 29 June--July 15, 2005 Practical methods for treating Majorana fermions [PDF]

PSI Zuoz Summer School on Particle Physics, Zuoz, Switzerland, 15--21 August, 2004 Introduction to Supersymmetry [Lecture 1 |Lecture 2| Lecture 3| Lecture 4]

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VIII. 2024 Conferences and workshops in particle physics

GGI Lectures on the Theory of Fundamental Interactions 2024, January 8--26, 2024 at the Galileo Galilei Institute for Theoretical Physics in Arcetri, Florence, Italy

The Future of Fundamental Composite Dynamics: Colliders, Cosmology and Tools, March 4--15, 2024 at the Mainz Institute for Theoretical Physics (MITP), Johannes Gutenberg University Mainz in Mainz, Germany

Bay Area Particle Theory Seminar (BAPTS), March 15, 2024 at San Francisco State University (SFSU) in San Francisco, CA USA

Second Annual U.S. Future Circular Collider (FCC) Workshop 2024, March 25--27, 2024 at MIT in Cambridge, MA USA

April APS Meeting 2024, April 3--6, 2024 in Sacramento, CA USA

Challenging the standard cosmological model, April 15--16, 2024 at the Royal Society in London, England

Cosmology, Astrophysics, Theory and Collider Higgs 2024 (CATCH22+2), May 1--5, 2024 in Dublin, Ireland

DPF Meeting and the Phenomenology Symposium (Pheno) 2024, May 13--17, 2024 at the University of Pittsburgh and Carnegie Mellon University in Pittsburgh, PA USA

Modular Invariance Approach to the Lepton and Quark Flavour Problems: from Bottom-up to Top-down, May 13--17, 2024 at the Mainz Institute for Theoretical Physics (MITP), Johannes Gutenberg University Mainz, in Mainz, Germany

4th EuCAPT Annual Symposium, May 14--16, 2024 at CERN in Geneva Switzerland

LoopFest XXII, May 20--22, 2024 at Southern Methodist University in Dallas, Texas, USA

Fundamental Physics in the Era of Big Data and Machine Learning, May 26--June 23, 2024 at the Aspen Center for Physics in Aspen, CO USA

The Microscopic Origin of Black Hole Entropy, June 2--30, 2024 at the Aspen Center for Physics in Aspen, CO USA

12th Edition of the Large Hadron Collider Physics Conference (LHCP 2024), June 3--7, 2024 at Northeastern University in Boston, MA USA

The Evaluation of the Leading Hadronic Contribution to the Muon g-2, June 3--7, 2024 at the Mainz Institute for Theoretical Physics (MITP), Johannes Gutenberg University Mainz, in Mainz, Germany

Pre-SUSY 2024: School on Supersymmetry and Unification of Fundamental forces, June 3--7, 2024 at the Instituto de Fisica Teorica (UAM/CSIC) in Madrid, Spain

PLANCK 2024: 65th International Conference from the Planck Scale to the Electroweak Scale, June 3--7, 2024 in Lisbon, Portugal

FCC Week 2024, June 10--14, 2024 in San Francisco, CA USA

31st International Conference on Supersymmetry and Unification of Fundamental Interactions: Theory meets Experiment (SUSY 2024), June 10--14, 2024 at the Instituto de Fisica Teorica (UAM/CSIC) in Madrid, Spain

Theory Facing Experiment on the Dark Matter and Flavor Puzzles, June 10--21, 2024, organized by the Mainz Institute for Theoretical Physics (MITP), Johannes Gutenberg University Mainz, at the Villa Orlandi in Anacapri, Capri Island, Italy

Crossroads between Theory and Phenomenology, June 10--28, 2024 at CERN in Geneva, Switzerland

Leveraging the Lepton Sector as a Probe for New Physics, June 23--July 21, 2024 at the Aspen Center for Physics in Aspen, CO USA

FLASY 2024: the 10th Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology, June 24--28, 2024 at the University of California Irvine in Irvine, CA USA

The 13th KUTS meeting: "Precision SUSY Higgs Mass Calculation Initiative", June 26--28, 2024 at DESY in Hamburg, Germany

The 2024 International Workshop on Future Linear Colliders (LCWS2024), July 8--11, 2024 at the University of Tokyo in Tokyo, Japan

42nd International Conference on High Energy Physics (ICHEP 2024), July 17--24, 2024 in Prague, Czech Republic

52nd SLAC Summer Institute (SSI 2024)--The Art of Precision: Calculations and Measurements, August 5--16, 2024 at the SLAC National Accelerator Laboratory in Menlo Park, CA USA

Inaugural US Muon Collider Meeting, August 7--9, 2024 at Fermilab in Batavia, IL USA

Tightening the Gap Between Scattering Amplitudes and Events at the LHC at Higher Orders, August 18--September 15, 2024 at the Aspen Center for Physics in Aspen, CO USA

Particle Astrophysics and Cosmology Including Fundamental InteraCtions (PACIFIC) 2024, August 24--September 2, 2024 at the University of California Richard Gump Research Station in French Polynesia

Workshop on the Standard Model and Beyond, August 25--September 4, 2024 at the Corfu Summer Schook and Workshops on Elementary Particle Physics and Gravity, in Mon-Repos, Corfu, Greece

XIII International Conference on New Frontiers in Physics, August 26--September 4, 2024 at the Conference Center of the Orthodox Academy of Crete (OAC), Kolymbari, Crete, Greece

The 30th W.E. Heraeus Summer School "Saalburg" for Graduate Students on "Foundations and New Methods in Theoretical Physics", Spetember 2--13, 2024 in Bayrischzell, Bayern, Germany

FCC-hh Studies for the next European Stategy: kickoff meeting, September 3, 2024, a virtual zoom-only meeting

Workshop on Multi-Higgs Models, September 3--6, 2024 at the Instituto Superior Técnico in Lisbon, Portugal

Higgs Days at Santander 2024, September 9--13, 2024 in Santander, Spain

Fundamental physics and gravitational wave detectors, September 9--20, 2024 in the Castello dei Principi Capano, in Pollica (SA), Italy

Ninth International Workshop on High Precision for Hard Processes at the LHC (HP2 2024), September 10--13, 2024, hosted by the University of Torino and INFN at Campus Luigi Einaudi, Torino, Italy

Accelerated expansion, dS, & Strings: From the Swampland to the Landscape, September 18--20, 2024 at Institute of Theoretical Physics (IFT), Madrid, Spain

Higgs Hunting 2024, September 23--25, 2024 at Orsay and Paris, France

A workshop celebrating the careers and achievements of Lawrence Hall and Hitoshi Murayama, September 26--28, 2024 at the David Brower Center in Berkeley, CA USA

QCD@LHC, October 7--11, 2024 in Freiburg, Germany

EFT & Multi-Loop Methods for Advancing Precision in Collider and Gravitational Wave Physics, October 7--31, 2024 at the Munich Institute for Astro-, Particle and BioPhysics (MIAPbP) in Garching, Germany

3rd ECFA Workshop on e+e- Higgs/EWK/top factories, October 9--11, 2024 in Paris, France

Bay Area Particle Theory Seminar (BAPTS), October 18, 2024 at San Francisco State University (SFSU) in San Francisco, CA USA

International Symposium of High Energy Physics (ISHEP), October 18--21, 2024 in Antalya, Turkey.

Extended scalar sectors from all angles, October 21--25, 2024 at CERN in Geneva, Switzerland

Bay Area Strings, Information & Cosmology Symposium (BASICS 2024), November 1--2, 2024 at the University of California, Berkeley in Berkeley, CA USA

Higgs 2024, November 4--8, 2024 in Uppsala, Sweden

Symposium on the 50th Anniversary of the November Revolution (Jpsi50), November 8, 2024 at SLAC National Accelerator Laboratory in Menlo Park, CA USA

Remembering Bj: a Symposium in Honor of James Bjorken, November 9, 2024 at SLAC National Accelerator Laboratory in Menlo Park, CA USA

Weinberg Inaugural Conference, November 14--17, 2024 at the AT&T Conference Center in Austin, TX USA

2024 PDG Collaboration and Advisory Committee meetings, November 20--22, 2024 at Lawrence Berkeley National Laboratory (LBNL) in Berkeley, CA USA

9th Symposium on Prospects in the Physics of Discrete Symmetries (Discrete 2024), December 2--6, 2024 at Gospodarsko razstavišče in Ljubljana, Slovenia

The 21st annual workshop of the LHC Higgs Working Group, December 4--6, 2024 at CERN in Geneva, Switzerland

The International Joint Workshop on the Standard Model and Beyond 2024/3rd Gordon Godfrey Workshop on Astroparticle Physics, December 9--13, 2024 at The University of New South Wales (UNSW) in Sydney, Australia

The US LHC Users Association annual meeting, December 16--18, 2024 at SLAC National Accelerator Laboratory in Menlo Park, CA USA

US Higgs Factory Planning, December 19--20, 2024 at SLAC National Accelerator Laboratory in Menlo Park, CA USA

9th International Conference on High Energy Particle and Nuclear Physics in the LHC Era (HEPNP2025), January 6--10, 2025 at the Universidad Técnica Federico Santa María (UTFSM) in Valparaíso, Chile.

Linear Collider Vision Community Event 2025, at CERN in Geneva, Switzerland

Joint March Meeting and April Meeting: APS Global Physics Summit, March 16--21, 2025 in Anaheim, CA USA

The XXXII International Workshop on Deep Inelastic Scattering and Related Subjects (DIS2025), March 24--28, 2025 in Cape Town, South Africa

The 14th KUTS meeting: "Precision SUSY Higgs Mass Calculation Initiative", April 7--9, 202 in Freiburg, Germany

3rd annual HF-FCC meeting, April 15--17, 2025, hosted jointly by Fermilab and Argonne National Laboratory

LoopFest XXIII, May 21--23, 2025 at the University of Alberta in Edmonton, Alberta Canada

Navigating new horizons: defining the next era of particle physics, June 2--27, 2025 at the Munich Institute for Astro-, Particle and BioPhysics (MIAPbP) in Garching, Germany

The 7th International Workshop on "Higgs as a Probe of New Physics" (HPNP2025), June 9--13, 2025 at Osaka University, in Osaka, Japan

Another compilation of upcoming particle physics conferences and workshops can be found here.

Listings of conferences and workshops from previous years are stored here.

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IX. University Service

Faculty Perceptions of a UCSC Research Environment in Need of Restoration and Improvement, a report by Howard E. Haber and David M. Harrington, sponsored by the UCSC Committee on Research and contributed in May, 1998 to the Advisory Report of the Millennium Committee. [HTML]

University Committee on Research Policy (UCORP) 1995--1996 Public web page.

Should UC renew its contract with the Department of Energy (DOE) to manage the Lawrence Livermore National Laboratory and Los Alamos National Laboratory? The following web page documents the 1996 UC systemwide campus debate on this question. A town meeting was held on the UCSC campus on March 7, 1996 to discuss these issues.

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X. Extracurricular Activities

Some of the physics students and I play softball in the UCSC intramural coed softball league. The fall season runs from early October to early December, and the spring season runs from early April to early June.

Our team, called Re-Entry, is sponsored by the STARS organization on campus, which provides support and counseling for returning (or re-entry) students to campus. You can follow our season exploits on the Re-Entry Team Webpage.

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XI. Physics, Math and Computer Links

Book Price comparisons

BookFinder.com book search

CERN links

Future Circular Collider

Large Hadron Collider (LHC)

LHC Physics Centre at CERN

LHC Performance and Statistics

LHC Programme Coordination web pages

ATLAS Online Luminosity [for more details click here]

CMS Online Luminosity [for more details click here]

CERN Physics results

ATLAS Documents

ATLAS Experiment--Public results

ATLAS Higgs Physics results

ATLAS Supersymmetry Physics results

CMS Documents

CMS Physics results

CMS Higgs Physics results

Higgs PAG Summary Plots

CMS Supersymmetry Physics results

Electroweak and Higgs precision observables

LEP Electroweak Working Group

LEP Higgs Working Group

GFITTER

LHC Higgs Cross Section Working Group (HXSWG)

SFitter Higgs coupling analysis

Higgs boson links

Precision SUSY Higgs Mass Calculation Initiative

SM Higgs production cross sections at √s = 13 TeV

SM Higgs Branching Ratios and Total Decay Widths

LHC Higgs Cross Section Working Group Twiki

Heavy Higgs and Beyond Standard Model subgroup of the HXSWG

Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables [Postscript | PDF]

Handbook of LHC Higgs Cross Sections: 2. Differential Distributions [Postscript | PDF]

Handbook of LHC Higgs Cross Sections: 3. Higgs Properties [Postscript | PDF]

Handbook of LHC Higgs Cross Sections: 4. Deciphering the nature of the Higgs sector [PDF]

High Energy Physics links

arXiv preprint server

High Energy Physics Software and Collider Tools

International Linear Collider

American Linear Collider Working Group

International Linear Collider (ILC) homepage

ILC Technical Design Report

CLIC detector and physics study (CLICdp)--WG Physics Potential

Compact Linear Collider (CLIC)

Journals

European Physics Journal C

JHEP

Journal of Mathematical Physics

Nuclear Physics B

Physical Review Online Archive (PROLA)

Physics Letters B

Physics Reports

Mathematics links

Mathematical Association of America

Table of integrals

Meetings and Conferences organized by SCIPP Theory

Howie-Fest-70, February 7, 2022 at the University of California, Santa Cruz, CA USA (held online)

SCIPP Reunion Theory Symposium, April 24, 2015 at the University of California, Santa Cruz

The search for Fundamental Physics: Higgs Bosons & Supersymmetry, A symposium in honor of Michael Dine and Howard Haber on the occasion of their 60th Birthdays, January 4--6, 2013

West Coast LHC Theory meeting, May 21, 2010

Confronting Challenges in Theoretical Physics, A Symposium in Honor of Tom Banks and Willy Fischler on the Occasion of their 60th Birthdays June 15--16, 2009

RADCOR 2000, 5th International Symposium on Radiative Corrections, September 11--15, 2000