Table of Contents


Contact Information

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 and Tuesdays, 3--4 pm
e-mail haber@scipp.ucsc.edu
alternate e-mail haber@ucsc.edu


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excerpted from a 1996 Foxtrot cartoon by Bill Amend

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The Higgs Boson Re-explained

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


RECENT NEWS

new!!! January 2, 2023: The 2023 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.

December 18, 2022: Today I posted a short note to Section VI of this website entitled Exponentiating the Lie algebra of the Lorentz group. In one method, the 4x4 Lorentz transformation matrix (for arbitrary boost and rotation parameters) is obtained by an explict computation of the exponential of the corresponding element of the SO(1,3) Lie algebra. In a second method, the four-vector nature of the spinor product with a free spacetime index is used to to obtain the matrix Λ, which only requires the exponentiation of 2x2 matrices. The two methods are shown to yield the same expression for Λ.

December 1, 2022: Cambridge University Press has announced the availability of a new textbook, entitled From Spinors to Supersymmetry, co-authored by Herbi K. Dreiner, Howard E. Haber and Stephen P. Martin, with an expected publication date of June 2023. Pre-orders are now available. For further details, check out this link.

November 30, 2022: Today, my paper in collaboration with Venus Keus and Rui Santos, entitled P-even, CP-violating Signals in Scalar-Mediated Processes, was pusblished in Physical Review D. A link to this paper can be found in Section II of this website.

November 17, 2022: I gave a talk at the IDT-WG3-Phys Open Meeting, which meets once each month to discuss topics assoicated with the ILC and other future e+e- colliders. My talk entitled P-even, CP-violating Signals in Scalar-Mediated Processes is posted to Section VII of thisc website.

October 5, 2022: My contribution to the Proceedings of the 7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021, entitled A natural mechanism for a SM-like Higgs boson in the 2HDM without decoupling, was published today by the Proceedings of Science. The writeup of my plenary talk can be found in Section II of this website.

October 4, 2022: My contribution to the Septeber, 2022 CERN EP Newsletter of the EP Department, entitled Higgs Boson Physics - The View Ahead is now available on the arXiv.   [PDF]

September 29, 2022: My contribution to the Septeber, 2022 CERN EP Newsletter of the EP Department, entitled Higgs Boson Physics - The View Ahead, was posted to https://ep-news.web.cern.ch/content/higgs-boson-physics-view-ahead. This was one of the contributions to the 10th anniversary of the Higgs boson celebrated this year at CERN.

August 30, 2022: My talk entitled P-even, CP-violating Signals in Scalar-Mediated Processes, given at the Workshop on Multi-Higgs Models at the Instituto Superior Técnico in Lisbon, Portugal, has been posted to Section VII of this website.

August 10, 2022: The 2022 edition of the Review of Particle Physics, published today in Progress of Theoretical and Experimental Physics (PTEP), 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 29, 2022: My talk entitled The anapole moment of a charged lepton in softly-broken Supersymmetric QED, given at the SUSY-2022 conference held at the University of Ioannina in Ioannina, Greece, has been posted to Section VII of this website.

The talk introduces the properties of the anapole moment of a pointlike charged particle. A one-loop computation of the static anapole moment of the electron (or muon) in softly-broken supersymmetric QED is presented. Some subtelties encountered in extending this result to the full MSSM are discussed.

June 22, 2022: Today, my paper in collaboration with Venus Keus and Rui Santos, entitled P-even, CP-violating Signals in Scalar-Mediated Processes, was posted today on the arXiv. A link to this paper can be found in Section II of this website.

New sources of neutral scalar-mediated CP violation that arise in extended Higgs sectors can originate in the Yukawa sector or in the structure of the scalar potential. Most treatments in the literature focus on CP-violating Yukawa interactions of neutral scalars, which is an example of P-odd CP violation since it derives from the mixing of two C-even operators of opposite sign P. In contrast, CP-violation arising from the scalar potential is P-even CP-violation, which can be observed by detecting three bosonic processes (suitably chosen) that are incompatible with the presence of a CP-symmetric scalar potential and/or vacuum. The discovery potential of such signals at various future multi-TeV lepton (and γγ) colliders is assessed. The potential for detecting loop-induced P-even, CP-violating phenomena is also considered.

June 13, 2022: Today, Physical Review D posted an erratum to my paper in collaboration with João P. Silva, entitled Exceptional regions of the 2HDM parameter space that appeared a year ago in Physical Review D 103, 115012 (2021). A link to this paper and the erratum can be found in Section II of this website.

May 25, 2022: The review entitled Two-component spinor techniques and Feynman rules for quantum field theory and supersymmetry that was published in Physics Reports in 2010 has now been superseded by a new (slightly enhanced) version, which corrects all errors in the published review that have come to the attention of the three authors. This new version is now available on the arXiv, where it appears as version 6 of arXiv:0812.1594 [hep-ph]. Further details can be found in Section III of this website.

May 16, 2022: The writeup of my talk, entitled A natural mechanism for a SM-like Higgs boson in the 2HDM without decoupling, which was given at the DISCRETE 2020-2021 conference held in Bergen, Norway on December 3, 2021 has now appeared on the arXiv.   [PDF]

news archive    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 my 2022 publications:

Links to my 2021 publications:

Links to my 2020 publications:

Links to my 2019 publications:

Links to my 2018 publications:

Links to my 2017 publications:

Links to my 2016 publications:

Links to my 2015 publications:

Links to Conference proceedings, 2013--2022:

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

  1. 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


  2. 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

  3. 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


  4. 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


  5. 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]


  6. 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]




  7. 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]


  8. 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]


  9. Basis-independent methods for the two-Higgs-doublet model. II. The Significance of tan beta.
    Howard E. Haber, Deva O'Neil (UC, Santa Cruz, Inst. Part. Phys.). 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


  10. Conditions for CP-violation in the general two-Higgs-doublet model
    John F. Gunion (UC, Davis (main)), Howard E. Haber (UC, Santa Cruz, Inst. Part. Phys.). Jun 2005. 46 pp.
    Published in Phys.Rev. D72 (2005) 095002
    SCIPP-04-16, UCD-2004-29
    DOI: 10.1103/PhysRevD.72.095002
    Published version:   [PDF]
    e-Print: hep-ph/0506227 | PDF


  11. 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



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


  1. 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]


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

  1. 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
    e-Print: arXiv:2210.00449 [hep-ph] | PDF
             References | BibTeX | LaTeX(US) | LaTeX(EU) | Harvmac | EndNote
             Abstract and PDF from arXiv.org

  2. 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]

  3. 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

  4. 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

  1. Supersymmetry, Part I (Theory).
    Benjamin C. Allanach (Cambridge U., DAMTP), Howard E. Haber (UC, Santa Cruz). Aug. 2021. 97 pp.
      PDF from the 2022 edition of the Review of Particle Physics
    Review of Particle Physics (RPP)
    Particle Data Group Collaboration (R.L. Workman (George Washington University) et al.). August 2022. 2270 pp.
    Published in PTEP 2022 (2022) 083C01
    DOI: 10.1093/ptep/ptac097
    Published version:   [PDF]
    Particle Data Group (PDG) webpage: [HTML]


  2. 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


  3. 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


  4. 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


  5. 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]


  6. 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]
    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]
  7. 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/.

  8. 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


  9. 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.


  10. 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.


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IV. Published Books

Co-authored books

  1. 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

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



Edited books

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


  2. 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)

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


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


  4. 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

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VI. Notes and other writings

  1. Exponentiating the Lie algebra of the Lorentz group     [PDF | PS]
  2. Rational approximations to ln 2     short version: [PDF | PS]; long version: [PDF | PS]
  3. Generalized Functions for Physics     [PDF | PS]
  4. Evaluating the finite part of the Passarino-Veltman function B0(p2;m12,m22)     [PDF | PS]
  5. Evaluating the one-loop function arising in h→γγ     [PDF | PS]
  6. Analytic formulae for the Feynman propagator in coordinate space     [PDF | PS]
  7. A Tale of Three Diagonalizations     [PDF | PS]
  8. Notes on the Matrix Exponential and Logarithm     [PDF | PS]
  9. What is the group of conjugate symplectic matrices?     [PDF | PS]
  10. Parameterization of real orthogonal antisymmetric matrices     [PDF | PS]
  11. Toward a set of 2HDM benchmarks     [PDF | PS]
  12. The eigenvalues of the quadratic Casimir operator and second-order indices of a simple Lie algebra     [PDF | PS]
  13. Notes on basis changes and matrix diagonalization     [PDF | PS]
  14. Notes on the complex inverse trigonometric and hyperbolic functions and their principal values     [PDF | PS]
  15. Electron wave function and mass renormalization in QED     [PDF | PS]
  16. Proof of a trace inequality in matrix algebra     [PDF | PS]
  17. Notes on the spontaneous breaking of SU(N) and SO(N) via a second-rank tensor multiplet     [PDF | PS]
  18. Notes on antisymmetric matrices and the pfaffian     [PDF | PS]
  19. Complex representation of scalar fields and the embedding of U(n) in SO(2n)     [PDF | PS]
  20. The probability that a product of random numbers is less than a fixed constant     [PDF | PS]
  21. Massless Majorana and Weyl fermions cannot be distinguished     [PDF | PS]

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VII. Talks at conferences, workshops and schools, 2004--2022

2022 Conferences and workshops

  1. 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]
  2. 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]
  3. 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

  1. 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]
  2. 49th SLAC Summer Institute (SSI 2021), at SLAC, Stanford, CA USA (held online), August 27, 2021     Higgs Boson Physics—The View Ahead   [PDF]
  3. Charged Higgs Online Workshop, August 30, 2021     Extended Higgs sector at present and future colliders   [PDF]
  4. DISCRETE 2020-2021, December 3, 2021     A natural mechanism for a SM-like Higgs boson in the 2HDM without decoupling   [PDF]

2020 Conferences and workshops

2019 Conferences and workshops

  1. Higgs Days at Santander 2019, in Santander, Spain, September 20, 2019     Future Perspectives (Part 2)   [PDF]
  2. Scalars 2019, at the University of Warsaw in Warsaw, Poland, September 14, 2019     The Future of Particle Physics---A Theorist’s Perspective   [PDF]
  3. Scalars 2019, at the University of Warsaw in Warsaw, Poland, September 14, 2019     Approximate alignment without decoupling in the 2HDM naturally   [PDF]
  4. 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]
  5. 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]
  6. 7th RISE Collaboration Workshop: NonMinimalHiggs, in Helsinki Finland, May 27, 2019     Approximate alignment without decoupling in the 2HDM naturally   [PDF]
  7. 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]

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

Schools and Pedagogical Lectures

  1. 49th SLAC Summer Institute (SSI 2021), at SLAC, Stanford, CA USA (held online), August 27, 2021     Higgs Boson Physics—The View Ahead   [PDF]

  2. 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]

  3. 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]

  4. 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]

  5. 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]

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

  7. 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]

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

  9. 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]

  10. 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]

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

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

  13. 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]

  14. 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. 2023 Conferences and workshops in particle physics

The 38th Advanced School in Theoretical Physics: QFT/String Theory in the times of COVID-19, December 27, 2022--January 5, 2023 at the Israel Institute for Advanced Studies (IIAS), the Hebrew University of Jerusalem, Israel

8th International Conference on "High Energy Physics in the LHC Era" (HEP2023), January 9--13, 2023 in Valparaíso, Chile

GGI Lectures on the Theory of Fundamental Interactions, January 9--27, 2023 at the Galileo Galilei Institute (GGI) for Theoretical Physics in Florence, Italy

New Directions in Theoretical Physics 4, January 10--12, 2023 at the Higgs Centre for Theoretical Physics in Edinburgh, Scotland

Exotic Approaches to Naturalness, January 30--February 3, 2023 at CERN in Geneva, Switzerland

Muon Collider Workshop, February 27--March 10, 2023, at the Kavli Institute for Theoretical Physics at the University of California, Santa Barbara, CA USA

KUTS workshop: "Precision SUSY Higgs Mass Calculation Initiative", February 27--March 1, 2023 at CERN in Geneva, Switzerland

Prospecting for New Physics through Flavor, Dark Matter, and Machine Learning, March 26--31, 2023 at the Aspen Center for Physics in Aspen, CO USA

"Herbi Fest"--Pursuing Physics Beyond the Standard Model: a symposium in honor of Herbi Dreiner on the occasion of his 60th birthday, March 27--28, 2023 at the Bethe Center for Theoretical Physics (BCTP), University of Bonn, Germany

Bay Area Particle Theory Seminar (BAPTS), April 14, 2023 at San Francisco State University (SFSU) in San Francisco, CA

American Physical Society April Meeting, April 15--18, 2023, in Minneapolis, MN USA

American Physical Society April Meeting, April 24--26, 2023, the virtual meeting

PLANCK 2023: 25th International Conference from the Planck Scale to the Electroweak Scale, May 22--26, 2023 in Warsaw, Poland

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, May 28--30, 2023 at the University of Chicago (and Fermilab on May 30) in Chicago, IL USA

16th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology (RADCOR 2023), May 28--June 2, 2023 at the Crieff Hydro Spa Hotel in Crieff, Scotland

Third EuCAPT Annual Symposium, May 31--June 2, 2023 at CERN in Geneva Switzerland

The 6th International Workshop on "Higgs as a Probe of New Physics" (HPNP2023), June 5--9, 2023 at Osaka University, in Osaka, Japan

Theoretical Advanced Study Institute in ELementary Particle Physics (TASI 2023), June 5--30, 2023 at the University of Colorady in Boulder, CO USA

New Opportunities in High Energy Physics, June 11--July 9, 2023 at the Aspen Center for Physics in Aspen, CO USA

New Trends in High-Energy Physics, July 1--7, 2023 at BITP in Kiev, Ukraine

PiTP 2023: "Understanding Confinement", July 10--21, 2023 at the Institute for Advanced Study, Princeton, NJ. USA

pre-SUSY 2023: School on Supersymmetry and Unification of Fundamental forces, July 10--14, 2023 at the University of Southampton in Southampton, UK

The XXX International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2023), July 17--21, 2023 at the University of Southampton in Southampton, UK

The 31st International Symposium on Lepton Photon Interactions at High Energies, July 17--21, 2023 in Melbourne, Australia

Traversing the Particle Physics Peaks--Phenomenology to Formal, July 30--August 20, 2023 at the Aspen Center for Physics in Aspen, CO USA

The European Physical Society Conference on High Energy Physics (EPS-HEP2023), August 21--25, 2023 at the University of Hamburg in Hamburg, Germany

EFT Foundations and Tools 2023, August 28--September 8, 2023 at the Mainz Institute for Theoretical Physics (MITP), Johannes Gutenberg University, in Mainz, Germany

Theory Challenges in the Precision Era of the Large Hadron Collider, August 28--October 13, 2023 at the Galileo Galilei Institute for Theoretical Physics in Arcetri, Florence, Italy

Higgs 2023, November 27--December 1, 2023 in Beijing, China

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

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

conference and workshop archive    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

CERN homepage

CERN users

CERN Theory group

CERN Document Server

CERN Yellow Reports

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

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]

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

High Energy Physics links

arXiv preprint server

INSPIRE HEP

CERN Document Server

Interactions.org

Particle Data Group

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

Particle physics outreach

The Particle Adventure

Hands on CERN

Physikshow at the University of Bonn

Particle physics jobs

Theoretical Particle Physics Jobs Rumor Mill

High Energy Physics Postdoc Rumor Mill

Physics blogs

Asymptotia

BackReAction

Cosmic Variance

Life and Physics

Of Particular Significance

Quantum Diaries

A Quantum Diaries Survivor

Resonaances

viXra log

Physics links

Division of Particles and fields of the APS

DPF Newsletter

American Physical Society

Professional publishers

EPJC Manuscript Central

ScienceDirect

SpringerLink

Search links

Google Books

Google Scholar

Snowmass 2021 links

The Particle Physics Community Planning Exercise

Energy Frontier

Theory Frontier

Tevatron physics results

Tevatron New Phenomena & Higgs Working Group

TeX and LaTeX links

The TeX Catalog Online

Selected extracts from the Comprehensive LaTeX Symbol List   [PDF]

Using Imported Graphics in LaTeX and pdfLaTeX


XII. Miscellaneous links of interest

Humor

Piled Higher and Deeper (Ph.D. Comics)

Sports

ESPN

Major League Baseball

National Football League

National Basketball Association

National Hockey League

San Francisco Giants

San Francisco 49ers

San Jose Sharks

Golden State Warriors

Weather

AccuWeather.com

The Weather Channel

The Weather Underground


XIII. Photographs

Photographs that I have taken at various physics conferences and workshops can be found at this link. Pictures of the Re-Entry coed softball team can be found here.

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haber@scipp.ucsc.edu
Last Updated: January 2, 2023