Abstract
Low energy observables involving the Standard Model fermions which are chirality-violating, such as anomalous electromagnetic moments, necessarily involve an insertion of the Higgs in order to maintain SU(2) × U(1) gauge invariance. As the result, the properties of the Higgs boson measured at the LHC impact our understanding of the associated low-energy quantities. We illustrate this feature with a discussion of the electromagnetic moments of the τ -lepton, as probed by the rare decay H → τ + τ − γ. We assess the feasibility of measuring this decay at the LHC, and show that the current bounds from lower energy measurements imply that 13 TeV running is very likely to improve our understanding of new physics contributing to the anomalous magnetic moment of the tau.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
ATLAS collaboration, Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC, Phys. Lett. B 716 (2012) 1 [arXiv:1207.7214] [INSPIRE].
CMS collaboration, Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Phys. Lett. B 716 (2012) 30 [arXiv:1207.7235] [INSPIRE].
D.E. Morrissey, T. Plehn and T.M.P. Tait, Physics searches at the LHC, Phys. Rept. 515 (2012) 1 [arXiv:0912.3259] [INSPIRE].
S. Chang, R. Dermisek, J.F. Gunion and N. Weiner, Nonstandard Higgs boson decays, Ann. Rev. Nucl. Part. Sci. 58 (2008) 75 [arXiv:0801.4554] [INSPIRE].
D. Curtin et al., Exotic decays of the 125 GeV Higgs boson, Phys. Rev. D 90 (2014) 075004 [arXiv:1312.4992] [INSPIRE].
H. Bélusca-Maïto and A. Falkowski, On the exotic Higgs decays in effective field theory, Eur. Phys. J. C 76 (2016) 514 [arXiv:1602.02645] [INSPIRE].
Muon g-2 collaboration, G.W. Bennett et al., Final report of the muon E821 anomalous magnetic moment measurement at BNL, Phys. Rev. D 73 (2006) 072003 [hep-ex/0602035] [INSPIRE].
D.J. Silverman and G.L. Shaw, Limits on the composite structure of the τ lepton and quarks from anomalous magnetic moment measurements in e + e − annihilation, Phys. Rev. D 27 (1983) 1196 [INSPIRE].
L.D. Almeida, A.A. Natale, S.F. Novaes and O.J.P. Eboli, Nonstandard γγ → ℓ + ℓ − processes in relativistic heavy ion collisions, Phys. Rev. D 44 (1991) 118 [INSPIRE].
F. del Aguila, F. Cornet and J.I. Illana, The possibility of using a large heavy ion collider for measuring the electromagnetic properties of the τ -lepton, Phys. Lett. B 271 (1991) 256 [INSPIRE].
M.A. Samuel and G. Li, Measuring the magnetic moment of the τ lepton at the Fermilab Tevatron, the SSC and the LHC, Int. J. Theor. Phys. 33 (1994) 1471 [INSPIRE].
A. Aeppli and A. Soni, Analysis of the τ dipole moment via e + e − and γγ reactions, Phys. Rev. D 46 (1992) 315 [INSPIRE].
R. Escribano and E. Masso, New bounds on the magnetic and electric moments of the τ lepton, Phys. Lett. B 301 (1993) 419 [INSPIRE].
R. Escribano and E. Masso, Improved bounds on the electromagnetic dipole moments of the τ lepton, Phys. Lett. B 395 (1997) 369 [hep-ph/9609423] [INSPIRE].
G.A. Gonzalez-Sprinberg, A. Santamaria and J. Vidal, Model independent bounds on the τ lepton electromagnetic and weak magnetic moments, Nucl. Phys. B 582 (2000) 3 [hep-ph/0002203] [INSPIRE].
J. Bernabeu, G.A. Gonzalez-Sprinberg, J. Papavassiliou and J. Vidal, Tau anomalous magnetic moment form-factor at super B/flavor factories, Nucl. Phys. B 790 (2008) 160 [arXiv:0707.2496] [INSPIRE].
J. Bernabeu, G.A. Gonzalez-Sprinberg and J. Vidal, Tau spin correlations and the anomalous magnetic moment, JHEP 01 (2009) 062 [arXiv:0807.2366] [INSPIRE].
S. Atag and A.A. Billur, Possibility of determining τ lepton electromagnetic moments in γγ → τ + τ − process at the CERN-LHC, JHEP 11 (2010) 060 [arXiv:1005.2841] [INSPIRE].
J. Peressutti and O.A. Sampayo, τ anomalous magnetic moment in γγ colliders, Phys. Rev. D 86 (2012) 035016 [INSPIRE].
A. Hayreter and G. Valencia, Constraining τ -lepton dipole moments and gluon couplings at the LHC, Phys. Rev. D 88 (2013) 013015 [Erratum ibid. D 91 (2015) 099902] [arXiv:1305.6833] [INSPIRE].
M. Fael, L. Mercolli and M. Passera, Towards a determination of the τ lepton dipole moments, Nucl. Phys. Proc. Suppl. 253-255 (2014) 103 [arXiv:1301.5302] [INSPIRE].
A. Hayreter and G. Valencia, Spin correlations and new physics in τ -lepton decays at the LHC, JHEP 07 (2015) 174 [arXiv:1505.02176] [INSPIRE].
S. Eidelman, D. Epifanov, M. Fael, L. Mercolli and M. Passera, τ dipole moments via radiative leptonic τ decays, JHEP 03 (2016) 140 [arXiv:1601.07987] [INSPIRE].
DELPHI collaboration, J. Abdallah et al., Study of τ -pair production in photon-photon collisions at LEP and limits on the anomalous electromagnetic moments of the τ lepton, Eur. Phys. J. C 35 (2004) 159 [hep-ex/0406010] [INSPIRE].
ALEPH collaboration, A. Heister et al., Search for anomalous weak dipole moments of the τ lepton, Eur. Phys. J. C 30 (2003) 291 [hep-ex/0209066] [INSPIRE].
J.-Q. Zhang, X.-C. Song, W.-J. Huo and T.-F. Feng, Anomalous magnetic and electric moments of τ and lepton flavor mixing matrix in effective Lagrangian approach, submitted to Commun. Theor. Phys. (2002) [hep-ph/0205309] [INSPIRE].
G.R. Bower, T. Pierzchala, Z. Was and M. Worek, Measuring the Higgs boson’s parity using τ →ρν, Phys. Lett. B 543 (2002) 227 [hep-ph/0204292] [INSPIRE].
K. Desch, Z. Was and M. Worek, Measuring the Higgs boson parity at a linear collider using the τ impact parameter and τ → ρν decay, Eur. Phys. J. C 29 (2003) 491 [hep-ph/0302046] [INSPIRE].
R. Harnik, A. Martin, T. Okui, R. Primulando and F. Yu, Measuring CP-violation in h→τ + τ − at colliders, Phys. Rev. D 88 (2013) 076009 [arXiv:1308.1094] [INSPIRE].
S. Berge, W. Bernreuther and J. Ziethe, Determining the CP parity of Higgs bosons at the LHC in their τ decay channels, Phys. Rev. Lett. 100 (2008) 171605 [arXiv:0801.2297] [INSPIRE].
S. Berge and W. Bernreuther, Determining the CP parity of Higgs bosons at the LHC in the τ to 1-prong decay channels, Phys. Lett. B 671 (2009) 470 [arXiv:0812.1910] [INSPIRE].
S. Berge, W. Bernreuther, B. Niepelt and H. Spiesberger, How to pin down the CP quantum numbers of a Higgs boson in its τ decays at the LHC, Phys. Rev. D 84 (2011) 116003 [arXiv:1108.0670] [INSPIRE].
S. Berge, W. Bernreuther and H. Spiesberger, Higgs CP properties using the τ decay modes at the ILC, Phys. Lett. B 727 (2013) 488 [arXiv:1308.2674] [INSPIRE].
K. Hagiwara, K. Ma and S. Mori, Probing CP-violation in h → τ − τ + at the LHC, arXiv:1609.00943 [INSPIRE].
Y. Chen, A. Falkowski, I. Low and R. Vega-Morales, New observables for CP-violation in Higgs decays, Phys. Rev. D 90 (2014) 113006 [arXiv:1405.6723] [INSPIRE].
CMS collaboration, Evidence for the 125 GeV Higgs boson decaying to a pair of τ leptons, JHEP 05 (2014) 104 [arXiv:1401.5041] [INSPIRE].
ATLAS collaboration, Search for the Standard Model Higgs boson produced in association with a vector boson and decaying into a τ pair in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, Phys. Rev. D 93 (2016) 092005 [arXiv:1511.08352] [INSPIRE].
CMS collaboration, Search for supersymmetry in events with a photon, a lepton and missing transverse momentum in pp collisions at \( \sqrt{s}=8 \) TeV, Phys. Lett. B 757 (2016) 6 [arXiv:1508.01218] [INSPIRE].
CMS collaboration, Search for additional neutral Higgs bosons decaying to a pair of τ leptons in pp collisions at \( \sqrt{s}=7 \) and 8 TeV, CMS-PAS-HIG-14-029, CERN, Geneva Switzerland (2014).
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
J. Alwall, Pythia-Pgs package webpage, https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/PythiaInterface.
S. Catani, F. Krauss, R. Kuhn and B.R. Webber, QCD matrix elements + parton showers, JHEP 11 (2001) 063 [hep-ph/0109231] [INSPIRE].
F. Krauss, Matrix elements and parton showers in hadronic interactions, JHEP 08 (2002) 015 [hep-ph/0205283] [INSPIRE].
J. Alwall et al., Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions, Eur. Phys. J. C 53 (2008) 473 [arXiv:0706.2569] [INSPIRE].
K. Hagiwara, T. Li, K. Mawatari and J. Nakamura, TauDecay: a library to simulate polarized τ decays via FeynRules and MadGraph5, Eur. Phys. J. C 73 (2013) 2489 [arXiv:1212.6247] [INSPIRE].
C. Degrande, C. Duhr, B. Fuks, D. Grellscheid, O. Mattelaer and T. Reiter, UFO — the Universal FeynRules Output, Comput. Phys. Commun. 183 (2012) 1201 [arXiv:1108.2040] [INSPIRE].
A. Alloul, N.D. Christensen, C. Degrande, C. Duhr and B. Fuks, FeynRules 2.0 — a complete toolbox for tree-level phenomenology, Comput. Phys. Commun. 185 (2014) 2250 [arXiv:1310.1921] [INSPIRE].
A. Alloul, B. Fuks and V. Sanz, Phenomenology of the Higgs effective Lagrangian via FEYNRULES, JHEP 04 (2014) 110 [arXiv:1310.5150] [INSPIRE].
A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, A. Huss and T.A. Morgan, Precise QCD predictions for the production of a Z boson in association with a hadronic jet, Phys. Rev. Lett. 117 (2016) 022001 [arXiv:1507.02850] [INSPIRE].
DELPHES 3 collaboration, J. de Favereau et al., DELPHES 3, a modular framework for fast simulation of a generic collider experiment, JHEP 02 (2014) 057 [arXiv:1307.6346] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet user manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
S. Frixione, Isolated photons in perturbative QCD, Phys. Lett. B 429 (1998) 369 [hep-ph/9801442] [INSPIRE].
L. Bianchini, J. Conway, E.K. Friis and C. Veelken, Reconstruction of the Higgs mass in H →ττ events by dynamical likelihood techniques, J. Phys. Conf. Ser. 513 (2014) 022035 [INSPIRE].
A. Elagin, P. Murat, A. Pranko and A. Safonov, A new mass reconstruction technique for resonances decaying to di-tau, Nucl. Instrum. Meth. A 654 (2011) 481 [arXiv:1012.4686] [INSPIRE].
C. Veelken, SVFitStandAlone webpage, https://github.com/veelken/SVfit standalone.
R.K. Ellis, I. Hinchliffe, M. Soldate and J.J. van der Bij, Higgs decay to τ + τ − : a possible signature of intermediate mass Higgs bosons at the SSC, Nucl. Phys. B 297 (1988) 221 [INSPIRE].
Y. Ozguven, S.C. İnan, A.A. Billur, M. Köksal and M.K. Bahar, Search for the anomalous electromagnetic moments of the τ lepton through electron-photon scattering at the CLIC, arXiv:1609.08348 [INSPIRE].
A.A. Billur and M. Koksal, Probe of the electromagnetic moments of the τ lepton in γγ collisions at the CLIC, Phys. Rev. D 89 (2014) 037301 [arXiv:1306.5620] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1610.01601
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Galon, I., Rajaraman, A. & Tait, T.M. H →τ + τ − γ as a probe of the τ magnetic dipole moment. J. High Energ. Phys. 2016, 111 (2016). https://doi.org/10.1007/JHEP12(2016)111
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP12(2016)111