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 2--4 pm
e-mail	haber@scipp.ucsc.edu
alternate e-mail	haber@ucsc.edu

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

RECENT NEWS

December 6, 2019: The 2019 update of the review articles appearing the Review of Particle Physics by the Particle Data Group (PDG) is now published on the PDG web site. More than half of the 119 review articles were revised, many of them very significantly. Included among these review articles is the newly revised Supersymmetry, Part I (Theory), which is now co-authored by myself and Ben Allanach.

September 20, 2019: My talk entitled Future Perspectives (Part 2), given at Higgs Days at Santander 2019 in Santander, Spain, has been posted to Section VII of this website.

September 14, 2019: At the Scalars 2019 conference in Warsaw, Poland, I gave two talks. The first talk, entitled Approximate alignment without decoupling in the 2HDM naturally, was given in response to the original invitation to the conference. The second talk, a brief 15 minute presentation that served as the concluding talk of the meeting, was entitled The Future of Particle Physics---A Theorist’s Perspective, and was given due to a request by the main organizer of the conference. Both talks have been posted to Section VII of this website.

September 11, 2019: The 1985 Physics Reports review by Howard Haber and Gordon Kane, The Search for Supersymmetry: Probing Physics Beyond the Standard Model, has reached 5,000 citations. It is now in the all-time Top 30 (excluding PDG-RPP) according to INSPIRE HEP.

August 15, 2019: I gave two talks collectively called Higgs Bosons: Past, Present and Future at the Sorak Symposium reminiscence on Particle Physics held at the NakSan Beach Hotel in Yang Yang, South Korea. The first talk was entitled, The incomplete and biased history of the Higgs boson, and the second talk was entitled, Quo Vadis Higgs (or what the current Higgs data is trying to tell us). Both talks have been posted to Section VII of this website.

May 27, 2019: My talk entitled Approximate alignment without decoupling in the 2HDM naturally, given at the 7th RISE Collaboration Workshop: NonMinimalHiggs in Helsinki, Finland, has been posted to Section VII of this website.

February 18, 2019: My talk entitled Symmetries and Mass Degeneracies in the Scalar Sector, given at HPNP2019 in Osaka, Japan, has been posted to Section VII of this website. This talk incorporates a number of new results and understandings as compared to the two previous presentations on the same subject given in September 2018 in Lisbon and in December 2018 in Warsaw.

January 30, 2019: I have written a set of notes entitled A tale of three diagonalizations, which presents an explicit computation of the diagonalization of a 2x2 matrix. This problem often arises in my work, and I have grown tired of continually rederiving these result when needed. So, these results now appear in one place for future reference. In addition to considering the diagonalization of a normal 2x2 matrix by a unitary similarity transformation, these notes also include an analysis of the singular value decomposition of a complex 2x2 matrix and the Autonne-Takagi factorization of a complex symmetric 2x2 matrix. These notes have been posted to Section VI of this website.

January 9, 2019: My presentation to Physics 205 can be found in Section V of this website.

January 5, 2019: The 2019 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.

January 4, 2019: My paper in collaboration with Odd Magne Ogreid, Per Osland and Margarida Nesbitt Rebelo entitled Symmetries and Mass Degeneracies in the Scalar Sector was published today by the Journal of High Energy Physics (JHEP). A link to this paper can be found in Section II of the academic website.

In this work, we explore some aspects of multi-Higgs doublet models that lead to mass degeneracies among some of the physical scalars. Natural scalar mass degeneracies are possible only in the inert two Higgs doublet model (IDM). In the case of three doublets, we introduce and analyze the replicated inert doublet model, which possesses two inert doublets of scalars. We then generalize this model to obtain a scalar potential, which is physically equivalent to a scalar potential first proposed by Ivanov and Silva (IS), with a CP4 symmetry that guarantees the existence of pairwise degenerate scalar states among two of the neutral CP-even, CP-odd and charged Higgs scalars. The properties of the CP4-symmetric IS model that is not invariant under the conventional CP transformation are examined.

December 31, 2018: Five years after its initial publication, version 4 of The ILC Higgs White paper, which corrects numerous typographical and other minor errors in Chapter 1: Higgs Theory, has been reposted to the arXiv. A link to this paper can be found in Section III of this website.

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).

The properties of the Higgs boson, which were discovered in 2012 at the Large Hadron Collider (LHC). 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--2018:

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 4 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 4 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 38 records

Twelve selected publications published from 2003--2014 are listed below.

Probing wrong-sign Yukawa couplings at the LHC and a future linear collider
P.M. Ferreira, John F. Gunion, Howard E. Haber, Rui Santos. Mar 19, 2014. 24 pp.
SCIPP-14-02, UCD-2014-2
Published in Phys.Rev. D89 (2014) 115003
DOI: 10.1103/PhysRevD.89.115003
Published version: [PDF]
e-Print: arXiv:1403.4736 [hep-ph] | PDF
Detailed record - Cited by 100 records
Decoupling of the Right-handed Neutrino Contribution to the Higgs Mass in Supersymmetric Models
Patrick Draper, Howard E. Haber. Apr 22, 2013. 27 pp.
SCIPP-13-04.
Published in Eur.Phys.J. C73 (2013) 2522
DOI: 10.1140/epjc/s10052-013-2522-7
Published version: [PDF]
e-Print: arXiv:1304.6103 [hep-ph] | PDF
Detailed record - Cited by 7 records

Mass-degenerate Higgs bosons at 125 GeV in the Two-Higgs-Doublet Model.
P.M. Ferreira, Howard E. Haber, Rui Santos, Joao P. Silva. Nov 2012. 17 pp.
SCIPP-12-14.
Published in Phys.Rev. D87 (2013) 055009
DOI: 10.1103/PhysRevD.87.055009
Published version: [PDF]
e-Print: arXiv:1211.3131 [hep-ph] | PDF
Detailed record - Cited by 79 records

Group-theoretic Condition for Spontaneous CP Violation.
Howard E. Haber (UC, Santa Cruz), Ze'ev Surujon (UC, Irvine). Jan 2012. 25 pp.
SCIPP-12-01, UCI-TR-2012-01.
Published in Phys.Rev. D86 (2012) 075007
DOI: 10.1103/PhysRevD.86.075007
Published version: [PDF]
e-Print: arXiv:1201.1730 [hep-ph] PDF
Detailed record - Cited by 23 records

Basis-independent methods for the two-Higgs-doublet model III: The CP-conserving limit, custodial symmetry, and the oblique parameters S, T, U.
Howard E. Haber, Deva O'Neil (UC, Santa Cruz). Nov 2010. 58 pp.
SCIPP-10-18.
Published in Phys.Rev. D83 (2011) 055017
DOI: 10.1103/PhysRevD.83.055017
Published version: [PDF]
e-Print: arXiv:1011.6188 [hep-ph]
Detailed record - Cited by 135 records

Supersymmetric Monojets at the Large Hadron Collider.
Benjamin C. Allanach (Cambridge U., DAMTP), Sebastian Grab, Howard E. Haber (UC, Santa Cruz). Oct 2010. 42 pp.
DAMTP-2010-83, SCIPP-10-16.
Published in JHEP 01 (2011) 138, Erratum-ibid. 07 (2011) 087, Erratum-ibid. 09 (2011) 027
DOI: 10.1007/JHEP01(2011)138, 10.1007/JHEP07(2011)087, 10.1007/JHEP09(2011)027
Published version: [PDF] [Erratum 1] [Erratum 2]
e-Print: arXiv:1010.4261 [hep-ph]
Detailed record - Cited by 35 records

Geometric picture of generalized-CP and Higgs-family transformations in the two-Higgs-doublet model.
P.M. Ferreira (Lisbon, ISEL & Lisbon U., CFTC), Howard E. Haber (UC, Santa Cruz), M. Maniatis, 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 4 records

Hard supersymmetry-breaking 'wrong-Higgs' couplings of the MSSM.
Howard E. Haber, John D. Mason (UC, Santa Cruz). Nov 2007. 32 pp.
SCIPP-07-16.
Published in Phys.Rev. D77 (2008) 115011
DOI: 10.1103/PhysRevD.77.115011
Published version: [PDF]
e-Print: arXiv:0711.2890 [hep-ph]
Detailed record - Cited by 35 records

Seesaw mechanism in the sneutrino sector and its consequences.
Athanasios Dedes (Durham U., IPPP & Ioannina U.), Howard E. Haber (UC, Santa Cruz), Janusz Rosiek (Durham U., IPPP & Warsaw, CFT). Jul 2007. 63 pp.
IPPP-07-16,CPT-07-32, SCIPP-07-10.
Published in JHEP 11 (2007) 059
DOI: 10.1088/1126-6708/2007/11/059
Published version: [PDF]
e-Print: arXiv:0707.3718 [hep-ph]
Detailed record - Cited by 54 records

Basis-independent methods for the two-Higgs-doublet model. II. The Significance of tan beta.
Howard E. Haber, Deva O'Neil (UC, Santa Cruz). Feb 2006. 48 pp.
SCIPP-06-01.
Published in Phys.Rev. D74 (2006) 015018, Erratum-ibid. D74 (2006) 059905
DOI: 10.1103/PhysRevD.74.015018, 10.1103/PhysRevD.74.059905
Published version: [PDF] [Erratum]
e-Print: hep-ph/0602242 | PDF
Detailed record - Cited by 152 records

Basis-independent methods for the two-Higgs-doublet model
Sacha Davidson (Durham U., IPPP & Lyon, IPN), Howard E. Haber (Durham U., IPPP & UC, Santa Cruz). Apr 2005. 45 pp.
IPPP-03-23, DCPT-03-46, SCIPP-04-15.
Published in Phys.Rev. D72 (2005) 035004, Erratum-ibid. D72 (2005) 099902
DOI: 10.1103/PhysRevD.72.035004, 10.1103/PhysRevD.72.099902
Published version: [PDF] [Erratum]
e-Print: hep-ph/0504050 | PDF
- References | BibTeX | LaTeX(US) | LaTeX(EU) | Harvmac | EndNote | ADS Abstract Service
- Abstract and Postscript and PDF from arXiv.org; Phys. Rev. D Server
Detailed record - Cited by 309 records

The CP conserving two Higgs doublet model: The Approach to the decoupling limit
John F. Gunion (UC, Davis), Howard E. Haber (UC, Santa Cruz). Jul 2002. 42 pp.
SCIPP-02-10.
Published in Phys.Rev. D67 (2003) 075019
DOI: 10.1103/PhysRevD.67.075019
Published version: [PDF]
e-Print: hep-ph/0207010 | PDF
- References | BibTeX | LaTeX(US) | LaTeX(EU) | Harvmac | EndNote | ADS Abstract Service
- Abstract and Postscript and PDF from arXiv.org; Phys. Rev. D Server
Detailed record - Cited by 683 records

My two most highly cited papers (not including reviews) are listed below.

Can the mass of the lightest Higgs boson of the minimal supersymmetric model be larger than m(Z)?
Howard E. Haber, Ralf Hempfling (UC, Santa Cruz). Nov 1990. 12 pp.
Published in Phys.Rev.Lett. 66 (1991) 1815-1818
SCIPP-90-42
DOI: 10.1103/PhysRevLett.66.1815
Published version: [PDF]
- References | BibTeX | LaTeX(US) | LaTeX(EU) | Harvmac | EndNote
- ADS Abstract Service; CERN Library Record ; Phys. Rev. Lett. Server
Detailed record - Cited by 1518 records
Higgs Bosons in Supersymmetric Models. 1.
J.F. Gunion (UC, Davis), Howard E. Haber (UC, Santa Cruz & SLAC). Aug 1984. 111 pp.
Published in Nucl.Phys. B272 (1986) 1, Erratum-ibid. B402 (1993) 567-569
SLAC-PUB-3404.
DOI: 10.1016/0550-3213(86)90340-8; 10.1016/0550-3213(93)90653-7
Published version: [PDF] [Erratum]
- References | BibTeX | LaTeX(US) | LaTeX(EU) | Harvmac | EndNote
- CERN Library Record ; SLAC Document Server; Journal Server - Nuclear Physics B; . Journal Server - Erratum-ibid.
Detailed record - Cited by 1414 records

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

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 - Cited by 1 record

The Higgs boson explained in 60 seconds

Howard E. Haber, Symmetry Magazine, volume 3, issue 6 (August, 2006) [HTML | 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. 2019. 37 pp.
Review of Particle Physics (RPP)
Particle Data Group Collaboration (M. Tanabashi (Nagoya U.& KMI, Nagoya) et al.). 2018. 1898 pp.
Published in Phys.Rev. D98 (2018) 030001
DOI: 10.1103/PhysRevD.98.030001
Published version: [PDF]
Detailed record - Cited by 3206 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 4 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 321 records

Two-component spinor techniques and Feynman rules for quantum field theory and supersymmetry.
Herbi K. Dreiner (Bonn U.), Howard E. Haber (UC, Santa Cruz), Stephen P. Martin (Northern Illinois U. & Fermilab). 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]
e-Print: arXiv:0812.1594 [hep-ph]
Detailed record - Cited by 340 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 v5 of our review with the (-1, +1, +1, +1) metric convention, which should be identical in content in every other respect: DHMspinors_v5.pdf.

The list of known corrections to the Physics Reports version (September 2010) is here: DHM_corr_PhysicsReports.pdf.

The list of known corrections to the arXiv v5 (311 pages, August 2010) is here: DHM_corr_v5.pdf.

Both the (+1,-1,-1,-1) and the (-1, +1, +1, +1) metric versions were made from the single LaTeX file DHMspinors_v5.tex. [If you are curious and want to LaTeX this for some reason, you may need the style files found here; other packages used should be in most standard LaTeX distributions. The choice of metric signature is implemented by simply changing a single character in the LaTeX file, namely the argument of line 16, with \def\signofmetric{0} corresponding to the (+1,-1,-1,-1) metric and \def\signofmetric{1} to the (-1, +1, +1, +1) metric.]

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 526 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 93 records

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]
Detailed record - Cited by 5039 records

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IV. Published Books

Co-authored books

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 1051 records

Cited by 4507 Google Scholar records

Link to The Higgs Hunter's Guide at 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 162 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.) (UC, Santa Cruz). 1987.
Published in SINGAPORE, SINGAPORE: WORLD SCIENTIFIC (1987) 497-953
Detailed record

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

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V. Teaching

Fall, 2019 Physics 116A Mathematical Methods in Physics I
Spring, 2019 Physics 251 Group Theory and Modern Physics
Winter, 2019 Physics 205 Introduction to Research "Research on the Theory of the Terascale" [PDF | Powerpoint]
Winter, 2018 Physics 215 Introduction to Non-Relativistic Quantum Mechanics
Winter, 2017 Physics 214 Electromagnetism II
Fall 2016 Physics 217 Quantum Field Theory I
Winter 2016 Physics 218 Advanced Quantum Field Theory
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

A Tale of Three Diagonalizations [PDF | PS]
Notes on the Matrix Exponential and Logarithm [PDF | PS]
What is the group of conjugate symplectic matrices? [PDF | PS]
Parameterization of real orthogonal antisymmetric matrices [PDF | PS]
Useful relations among the generators in the defining and adjoint representations of SU(N) [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]
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--2019

2019 Conferences and workshops

Higgs Days at Santander 2019, in Santander, Spain, September 20, 2019 Future Perspectives (Part 2) [PDF]

Scalars 2019, at the University of Warsaw in Warsaw, Poland, September 14, 2019 The Future of Particle Physics---A Theorist’s Perspective [PDF]

Scalars 2019, at the University of Warsaw in Warsaw, Poland, September 14, 2019 Approximate alignment without decoupling in the 2HDM naturally [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 Higgs boson [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]

7th RISE Collaboration Workshop: NonMinimalHiggs, in Helsinki Finland, May 27, 2019 Approximate alignment without decoupling in the 2HDM naturally [PDF]

The 4th Toyama International Workshop on "Higgs as a Probe of New Physics 2019" (HPNP2019), in Osaka, Japan, February 18, 2019 Symmetries and Mass Degeneracies in the Scalar Sector [PDF]

2018 Conferences and workshops

The 5th HARMONIA Warsaw-Lisbon-Catania-Dresden meeting, at the OCHOTA campus of the University of Warsaw, in Warsaw, Poland, December 6--8, 2018 Symmetries and Mass Degeneracies in the Scalar Sector [PDF]

GGI Workshop: "Beyond the Standard Model: Where do we go from here?", at the Galileo Galilei Institute for Theoretical Physics in Arcetri, Florence, Italy, September 26, 2018 Discussion on Future Colliders [PDF]

Workshop on Multi-Higgs Models , at the Instituto Superior Técnico in Lisbon, Portugal, September 4, 2018 Symmetries and Mass Degeneracies in the Scalar Sector [PDF]

GGI Workshop: "Beyond the Standard Model: Where do we go from here?", at the Galileo Galilei Institute for Theoretical Physics in Arcetri, Florence, Italy, August 30, 2018 Beyond the Standard Model: Where do we go from here? [PDF]

MASS2018: Origin of Mass at the High Energy and Intensity Frontier, at CP³ Origins in Odense, Denmark, June 1, 2018 Beyond the Standard Model Higgs Boson [PDF]

PLANCK 2018: 21st International Conference from the Planck Scale to the Electroweak Scale, in Bonn, Germany, May 22, 2018 Mass Degeneracies in Extended Higgs Sectors [PDF]

Rencontres de Moriond: QCD and High Energy Interactions, in La Thuile, Aosta Valley, Italy, March 20, 2018 Approximate Higgs alignment without decoupling [PDF]

TRIUMF Theory Workshop on New Physics and the Higgs, at TRIUMF in Vancouver, BC, Canada, February 20, 2018 Mass Degeneracies in Extended Higgs Sectors [PDF]

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

Schools and Pedagogical Lectures

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. 2019 Conferences and workshops in particle physics

Bahamas Advanced Studey Institute & Conferences (BASIC 2019), January 6--12, 2019 at Stella Maris, Long Island, Bahamas

IAS Program: High Energy Physics, January 7--25, 2019 at the Hong Kong University of Science and Technology in Hong Kong, China

Zurich Phenomenology Workshop: A new look at Dark Matter (ZPW2019), January 9--11, 2019, at the Pauli Center for Theoretical Studies in Zurich, Switzerland

New Directions in Theoretical Physics 3, January 9--11, 2019, organized by the Higgs Centre for Theoretical Physics, at the University of Edinburgh in Edinburgh, Scotland

COST Workshop on Higgs and Flavour Physics: Present and Future, January 14--17, 2019 at the Instituto Superior Técnico in Lisbon, Portugal

CLIC Workshop 2019, January 21--25, 2019 at CERN in Geneva, Switzerland

2019 Rencontre de Physique des Particules, January 23--25, 2019 at the LPC Clermont (UCA) in Aubière, France

"Matter and the Universe" (MU) Days 2019, February 14--15, 2019 at DESY in Hamburg, Germany

The 4th International Workshop on "Higgs as a Probe of New Physics 2019" (HPNP2019), February 18--22, 2019 at Osaka University in Osaka, Japan

6th RISE Collaboration Meeting: NonMinimalHiggs, February 20, 2019 at Osaka University in Osaka, Japan

Les Rencontres de Physique de la Vall&ée d'Aoste, March 10--16, 2019 in La Thuile, Aosta Valley, Italy

Bay Area Particle Theory Seminar (BAPTS), March 15, 2019 at San Francisco State University (SFSU) in San Francisco, CA

54th Rencontres de Moriond EW 2018, March 16--23, 2019, in La Thuile, Aosta Valley, Italy

54th Rencontres de Moriond: QCD and High Energy Interactions, March 23--30, 2019, in La Thuile, Aosta Valley, Italy

Aspen 2019 Winter Confererence "In Pursuit of New Partices and Paradigms", March 24--30, 2019, at the Aspen Center for Physics in Aspen, CO USA

Linear Collider Community Meeting, April 8--9, 2019 at the SwissTech Convention Center, in Lausanne, Switzerland

10th KUTS Workshop, April 8--10, 2019 at Dresden University in Dresden, Germany

April APS Meeting 2019, April 13--16, 2019 in Denver, CO USA

Higgs and Effective Field Theory (HEFT 2019), April 15--18, 2019 at the Center for Cosmology and Particle Physics Phenomenology (CP3), Université Catholique de Louvain in Louvain-la-Neuve, Belgium

An Alpine LHC Physics Summit (ALPS 2019), April 22--27, 2019, Obergurgl University Center in Tyrol, Austria

MIAPP programme: "Beyond the Standard Model with Precision Flavour Experiments", April 29--May 24, 2019 at the Munich Institute for Astro- and Particle Physics in Munich, Germany

Phenomenology 2019 Symposium (PHENO 2019), May 6--9, 2019 at the University of Pittsburgh in Pittsburgh, PA USA

CERN Council Open Symposium on the Update of European Strategy for Particle Physics, May 13--16, 2019 in Granada, Spain [Program]

Pre-SUSY International School, May 15--18, 2019 at Texas A&M University in Corpus Christi

Multiple Vertices and Hidden Sectors: Celebrating the Distinguished Career of Professor John Jaros, May 17, 2019 at SLAC in Menlo Park, CA USA

Flavor 2019: new physics in flavor from LHC to BELLE II, May 20--22, 2019 at the Munich Institute for Astro- and Particle Physics in Munich, Germany

27th International Conference on Supersymmetrty and Unification of Fundamental Interactions (SUSY 2019), May 20--24, 2019 at Texas A&M University in Corpus Christi

7th Edition of the Large Hadron Collider Physics Conference", May 20--25, 2019 at Benemérita Universidad Autónoma de Puebla in Puebla, Mexico

7th RISE Collaboration Meeting: NonMinimalHiggs, May 27--29, 2019 at the Physicum, Kumpula campus, University of Heksinki, in Helsinki, Finland

2019 MIAPP programme "The Weak Scale at a Crossroads: Lessons from the LHC and Beyond", May 27--June 21, 2019 at the Munich Institute for Astro- and Particle Physics in Munich, Germany

PLANCK 2019: 22st International Conference from the Planck Scale to the Electroweak Scale, June 3--7, 2019 in Granada, Spain

Invisibles19 School, June 3--7, 2019 at the Laboratorio Subterráneo de Canfranc in Spain.

2019 Theoretical Advanced Study Institute (TASI 2019), "The Many Dimensions of Quantum Field Theory", June 3--28, 2019 at the University of Colorado in Boulder, CO USA

24th Rencontres Itzykson--Effective Field Theory in Cosmology, Gravitation and Particle Physics, June 5--7, 2019 at IPhT of CEA-Saclay, Univeristé Paris-Saclay, in Gif-sur-Yvette, France

Invisibles19 Workshop, June 10--14 in Valencia, Spain

Les Houches Workshop Series: "Physics at TeV Colliders (PhysTeV), Les Houches 2019, June 10--28, 2019 in Les Houches, France

IFT Workshop: Opportunities at Future High Energy Colliders, June 11--July 5, 2019 at the Instituto de Fisica Téorica UAM-CSIC in Madrid, Spain

1st Workshop on Tools for Low-Energy SMEFT Phenomenology (SMEFT-Tools 2019), June 12--14, 2019, at the Institute for Particle Physics Phenomenology, University of Durham, at Durham, UK

The 3rd International Conference on Charged Lepton Flavor Violation (CLFV2019), June 17--19, 2019 at the Fukuoka International Congress Center in Fukuoka, Japan

MITP 2019 workshop - "Indirect Searches for New Physics Across the Scales", June 17--July 12, 2019 at the Mainz Institute for Theoretical Physics in Mainz, Germany

25th International Symposium on Particles, Strings and Cosmology (PASCOS 2019), July 1--5, 2019 in Manchester, UK

European Physical Society Conference on High Energy Physics (EPS-HEP2019), July 10--17, 2019 in Ghent, Belgium

SLAC Neutrino Workshop: Precision Investigations of the Neutrino Sector (PINS 2019), July 14--17, 2019 at SLAC in Menlo Park, CA USA

11th International Workshop on Boosted Object Phenomenology, Reconstruction and Searches in HEP (BOOST 2019), July 21--26, 2019 at MIT in Cambridge, MA USA

Higgs Hunting 2019, July 29--31, 2019 at Orsay-Paris, France

DPF 2019, July 29--August 2, 2019 at Northeastern University in Boston, MA USA

Searching for new physics, August 4--10, 2019 at the Crocker Science Center, University of Utah, Salt Lake City, Utau USA

XXIX International Symposium on Lepton Photon Interactions at High Energies (LP2019), August 5--10, 2019 at Westin Harbour Castle in Toronto, Canada

The Energy Frontier Beyond LHC Run 2, August 11--September 15, 2019 at the Aspen Center for Physics in Aspen, CO USA

LoopFest XVIII, August 12--14, 2019 at Fermilab in Batavia, IL USA

Sorak Symposium reminiscence on Particle Physics, August 12--16, 2019 in South Korea

47th SLAC Summer Institute: Menu of Flavors--Quarks, Charged Leptons and Neutrinos, August 12--23, 2019, at SLAC, in Menlo Park, CA USA

Celebrating Tom Weiler's 70th birthday, August 14, 2019 at Vanderbilt University, in Nashville, TN USA

8th International Conference on New Frontiers in Physics (ICNFP 2019), August 21--29, 2019 at the Orthodox Academy of Creta (OAC) in Kolymbari, Crete

GGI Workshop: "Next Frontiers in the Search for Dark Matter", August 26--October 11, 2019 at the Galileo Galilei Institute for Theoretical Physics in Arcetri, Florence, Italy

Workshop on Connecting Insights in Fundamental Physics: Standard Model and Beyond, August 31--September 11, 2019 in Corfu, Greece

14th International Symposium on Radiative Corrections (RADCOR 2019), September 9--13, 2019 in Avignon, France

6th HARMONIA Warsaw-Lisbon-Catania-Dresden Meeting , September 9--14, 2019 in Warsaw, Poland

Scalars 2019, September 11--14, 2019 at the University of Warsaw OCHOTA campus, Warsaw, Poland

International Workshop on the Circular Electron-Positron Collider, September 16--18, 2019 at the Physics Research Center, University of Chicago in Chicago, IL USA

Higgs Days at Santander 2019, September 16--20, 2019 in Santander, Spain

James Stirling Memorial Conference, Spetember 17--18, 2019, at the Institute for Particle Physics Phenomenology (IPPP), University of Durham, in Durham, UK

Peter Higgs' 90th Birthday Celebration, September 20, 2019 at the Playfair Library, University of Edinburgh, Scotland, UK

Symposium for Mary K. Gaillard, September 21--22, 2019, at the Brower Center in Berkeley, CA

1st Mediterranean Conference on Higgs Physics (MCHP) September 23--26, 2019, in Tangier, Morocco

2nd Workshop on Hadronic Contributions to New Physics Searches (HC2NP), September 23--28, 2019 in Puerto de la Cruz, Tenerife, Spain

Higgs Couplings, September 30--October 4, 2019 at the University of Oxford in Oxford, UK

KIT-NEP '19--Theory Challenges in Higher-Order New Physics Calculations, October 7--9, 2019 at the Karlsruhe Institute of Technology (KIT) in Karlsruhe, Germany

Hot Topic in Neutrino Physics, October 7--11, 2019 at CERN, Geneva, Switzerland

Symposium on "Higgs and Flavour Today" (GUIFEST), October 15, 2019 at the Instituto de Física Corpuscular (IFIC) in Valencia, Spain

2019 US LHC Users Association Meeting, October 15--17, 2019 at Rice University in Houston, TX USA

The 16th General Assembly of the LHC Higgs Cross Section Working Group (HXSWG), October 16--18, 2019 at CERN in Geneva, Switzerland

West Coast LHC Jamboree, October 22--23, 2019 at SLAC, in Menlo Park, CA USA

Bay Area Particle Theory Seminar (BAPTS), October 25, 2019 at San Francisco State University (SFSU) in San Francisco, CA

2019 International Workshop on Future Linear Colliders (LCWS 2019), October 28--November 1, 2019 at the Sendai International Center in Sendai, Japan

11th KUTS Workshop, November 20--22, 2019 at the Max Planck Institute in Munich, Germany

13th Annual Helmholtz Alliance Workshop on "Physics at the Terascale", November 25--27, 2019 at DESY in Hamburg, Germany

Ultimate Precision at Hadron Coliders, November 25--December 6, 2019 at Institut Pascal (Paris-Saclay), France

Miami 2019: a conference on elementary particle physics, astrophysics, and cosmology, December 12--18, 2019, in Fort Lauderdale, Florida.

37th Advanced School in Theoretical Physics: New Ideas for Old Puzzles in Particle Physics, December 29, 2019--January 9, 2020, at the Hebrew University of Jerusalem, Israel

International Conference on Neutrinos and Dark Matter (N&DM-2020), January 11--14, 2020 in Hurgada, Egypt

CERN-TH institute programme: New Physics on the Low-Energy Precision Frontier, January 20--February 7, 2020, at CERN in Generva, Switzerland

Bay Area Particle Theory Seminar (BAPTS), April 10, 2020 at San Francisco State University (SFSU) in San Francisco, CA

April APS Meeting 2019, April 18--21, 2020 in Washington, DC USA

XIV International Conference on Interconnections between Particle Physics and Cosmology, May 18--22, 2020 in Norman, Oklahoma USA

PSI Summer School--Vision and Precision, August 9--15, 2020, at the Lyceum Alpinum, Zuoz, Switzerland

Workshop on Multi-Higgs Models, September 1--4, 2020 in Lisbon, Portugal

Higgs Hunting 2020, September 7--9, 2020 at Orsay-Paris, France

New Physics from Precision at High Energies, March 8--May 21, 2021, at the Kavli Institute for Theoretical Physics at the University of California, Santa Barbara, CA USA

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

AddALL 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 TWiki Portal

ATLAS Documents

ATLAS Experiment--Public results

ATLAS Higgs Physics results

ATLAS Supersymmetry Physics results

CMS Documents

CMS Physics results

CMS Higgs Physics results

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

LHC Higg 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]

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

Mathematica and Maple links

List of Mathematica Commands

Maple cheatsheet

Mathematics links

Mathematical Association of America

Table of integrals

Meetings and Conferences organized by SCIPP Theory

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