Abstract
With the discovery of the Higgs at the LHC, experiments have finally addressed all aspects of the Standard Model (SM). At this stage, it is important to understand which windows for beyond the SM (BSM) physics are still open, and which are instead tightly closed. We address this question by parametrizing BSM effects with dimension-six operators and performing a global fit to the SM. We separate operators into different groups constrained at different levels, and provide independent bounds on their Wilson coefficients taking into account only the relevant experiments. Our analysis allows to assert in a model-independent way where BSM effects can appear in Higgs physics. In particular, we show that deviations from the SM in the differential distributions of \( h\ \to\ V\overline{f}f \) are related to other observables, such as triple gauge-boson couplings, and are then already constrained by present data. On the contrary, BR(h → Zγ) can still hide large deviations from the SM.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
J. Elias-Miro, J. Espinosa, E. Masso and A. Pomarol, Higgs windows to new physics through D = 6 operators: constraints and one-loop anomalous dimensions, JHEP 11 (2013) 066 [arXiv:1308.1879] [INSPIRE].
Z. Han and W. Skiba, Effective theory analysis of precision electroweak data, Phys. Rev. D 71 (2005) 075009 [hep-ph/0412166] [INSPIRE].
F. del Aguila and J. de Blas, Electroweak constraints on new physics, Fortsch. Phys. 59 (2011) 1036 [arXiv:1105.6103] [INSPIRE].
E. Masso and V. Sanz, Limits on Anomalous Couplings of the Higgs to Electroweak Gauge Bosons from LEP and LHC, Phys. Rev. D 87 (2013) 033001 [arXiv:1211.1320] [INSPIRE].
R. Contino, M. Ghezzi, C. Grojean, M. Muhlleitner and M. Spira, Effective Lagrangian for a light Higgs-like scalar, JHEP 07 (2013) 035 [arXiv:1303.3876] [INSPIRE].
B. Dumont, S. Fichet and G. von Gersdorff, A Bayesian view of the Higgs sector with higher dimensional operators, JHEP 07 (2013) 065 [arXiv:1304.3369] [INSPIRE].
B. Grinstein, C.W. Murphy and D. Pirtskhalava, Searching for new physics in the three-body decays of the Higgs-like particle, JHEP 10 (2013) 077 [arXiv:1305.6938] [INSPIRE].
M. Ciuchini, E. Franco, S. Mishima and L. Silvestrini, Electroweak Precision Observables, New Physics and the Nature of a 126 GeV Higgs Boson, JHEP 08 (2013) 106 [arXiv:1306.4644] [INSPIRE].
G. Giudice, C. Grojean, A. Pomarol and R. Rattazzi, The strongly-interacting light Higgs, JHEP 06 (2007) 045 [hep-ph/0703164] [INSPIRE].
J. Elias-Miró, J. Espinosa, E. Masso and A. Pomarol, Renormalization of dimension-six operators relevant for the Higgs decays h → γγ, γZ, JHEP 08 (2013) 033 [arXiv:1302.5661] [INSPIRE].
B. Grzadkowski, M. Iskrzynski, M. Misiak and J. Rosiek, Dimension-Six Terms in the Standard Model Lagrangian, JHEP 10 (2010) 085 [arXiv:1008.4884] [INSPIRE].
W. Buchmüller and D. Wyler, Effective Lagrangian Analysis of New Interactions and Flavor Conservation, Nucl. Phys. B 268 (1986) 621 [INSPIRE].
G. D’Ambrosio, G. Giudice, G. Isidori and A. Strumia, Minimal flavor violation: an effective field theory approach, Nucl. Phys. B 645 (2002) 155 [hep-ph/0207036] [INSPIRE].
M.E. Peskin and T. Takeuchi, A new constraint on a strongly interacting Higgs sector, Phys. Rev. Lett. 65 (1990) 964 [INSPIRE].
R. Barbieri, A. Pomarol, R. Rattazzi and A. Strumia, Electroweak symmetry breaking after LEP-1 and LEP-2, Nucl. Phys. B 703 (2004) 127 [hep-ph/0405040] [INSPIRE].
ALEPH, DELPHI, L3, OPAL, SLD, LEP Electroweak Working Group, SLD Electroweak Group and SLD Heavy Flavour Group collaborations, S. Schael et al., Precision electroweak measurements on the Z resonance, Phys. Rept. 427 (2006) 257 [hep-ex/0509008] [INSPIRE].
LEP, ALEPH, DELPHI, L3, OPAL and LEP TGC Working Group collaborations, A combination of preliminary results on gauge boson couplings measured by the LEP experiments, LEPEWWG/TGC/2003-01 (2004).
M. Baak et al., The Electroweak Fit of the Standard Model after the Discovery of a New Boson at the LHC, Eur. Phys. J. C 72 (2012) 2205 [arXiv:1209.2716] [INSPIRE].
A. Arbuzov et al., ZFITTER: a semi-analytical program for fermion pair production in e + e − annihilation, from version 6.21 to version 6.42, Comput. Phys. Commun. 174 (2006) 728 [hep-ph/0507146] [INSPIRE].
ALEPH, DELPHI, L3, OPAL and LEP Electroweak collaborations, S. Schael et al., Electroweak Measurements in Electron-Positron Collisions at W-Boson-Pair Energies at LEP, Phys. Rept. 532 (2013) 119 [arXiv:1302.3415] [INSPIRE].
M. Antonelli et al., An evaluation of |V us | and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays, Eur. Phys. J. C 69 (2010) 399 [arXiv:1005.2323] [INSPIRE].
CMS collaboration, Search for new physics in final states with a lepton and missing transverse energy in pp collisions at the LHC, Phys. Rev. D 87 (2013) 072005 [arXiv:1302.2812] [INSPIRE].
O. Domenech, A. Pomarol and J. Serra, Probing the SM with Dijets at the LHC, Phys. Rev. D 85 (2012) 074030 [arXiv:1201.6510] [INSPIRE].
J. de Blas, M. Chala and J. Santiago, Global Constraints on Lepton-Quark Contact Interactions, Phys. Rev. D 88 (2013) 095011 [arXiv:1307.5068] [INSPIRE].
K. Hagiwara, R. Peccei, D. Zeppenfeld and K. Hikasa, Probing the Weak Boson Sector in e + e − W + W −, Nucl. Phys. B 282 (1987) 253 [INSPIRE].
DELPHI collaboration, J. Abdallah et al., Measurements of CP-conserving Trilinear Gauge Boson Couplings WWV (V = γ, Z) in e + e − Collisions at LEP2, Eur. Phys. J. C 66 (2010) 35 [arXiv:1002.0752] [INSPIRE].
ATLAS collaboration, Combined coupling measurements of the Higgs-like boson with the ATLAS detector using up to 25 fb −1 of proton-proton collision data, ATLAS-CONF-2013-034 (2013).
CMS collaboration, Updated measurements of the Higgs boson at 125 GeV in the two photon decay channel, CMS-PAS-HIG-13-001 (2013).
CMS collaboration, Properties of the Higgs-like boson in the decay H to ZZ to 4l in pp collisions at \( \sqrt{s} \) = 7 and 8 TeV, CMS-PAS-HIG-13-002 (2013).
CMS collaboration, Evidence for a particle decaying to W+W- in the fully leptonic final state in a standard model Higgs boson search in pp collisions at the LHC, CMS-PAS-HIG-13-003 (2013).
A. Falkowski, F. Riva and A. Urbano, Higgs at last, JHEP 11 (2013) 111 [arXiv:1303.1812] [INSPIRE].
CMS collaboration, Search for a Higgs boson decaying into a Z and a photon in pp collisions at \( \sqrt{s} \) = 7 and 8 TeV, Phys. Lett. B 726 (2013) 587 [arXiv:1307.5515] [INSPIRE].
ATLAS collaboration, Search for the Standard Model Higgs boson in the H → Zγ decay mode with pp collisions at \( \sqrt{s} \) = 7 and 8 TeV, ATLAS-CONF-2013-009 (2013).
S. Choi, D. Miller, M. Muhlleitner and P. Zerwas, Identifying the Higgs spin and parity in decays to Z pairs, Phys. Lett. B 553 (2003) 61 [hep-ph/0210077] [INSPIRE].
Q.-H. Cao, C. Jackson, W.-Y. Keung, I. Low and J. Shu, The Higgs Mechanism and Loop-induced Decays of a Scalar into Two Z Bosons, Phys. Rev. D 81 (2010) 015010 [arXiv:0911.3398] [INSPIRE].
Y. Gao et al., Spin determination of single-produced resonances at hadron colliders, Phys. Rev. D 81 (2010) 075022 [arXiv:1001.3396] [INSPIRE].
D. Stolarski and R. Vega-Morales, Directly Measuring the Tensor Structure of the Scalar Coupling to Gauge Bosons, Phys. Rev. D 86 (2012) 117504 [arXiv:1208.4840] [INSPIRE].
G. Isidori, A.V. Manohar and M. Trott, Probing the nature of the Higgs-like Boson via h → \( V\mathcal{F} \) decays, Phys. Lett. B 728 (2014) 131 [arXiv:1305.0663] [INSPIRE].
G. Isidori and M. Trott, Higgs form factors in Associated Production, arXiv:1307.4051 [INSPIRE].
LHC Higgs Cross Section Working Group collaboration, A. David et al., LHC HXSWG interim recommendations to explore the coupling structure of a Higgs-like particle, arXiv:1209.0040 [INSPIRE].
S. Dawson, S.K. Gupta and G. Valencia, CP violating anomalous couplings in Wγ and Zγ production at the LHC, Phys. Rev. D 88 (2013) 035008 [arXiv:1304.3514] [INSPIRE].
M. Carrel, Comment on non-compact composite Higgs models and constraints on the phenomenology of dimension 6 operators, MSc Thesis, EPFL, Lausanne Switzerland (2013).
N.D. Christensen and C. Duhr, FeynRules — Feynman rules made easy, Comput. Phys. Commun. 180 (2009) 1614 [arXiv:0806.4194] [INSPIRE].
J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond, JHEP 06 (2011) 128 [arXiv:1106.0522].
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: 1308.2803
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
About this article
Cite this article
Pomarol, A., Riva, F. Towards the ultimate SM fit to close in on Higgs physics. J. High Energ. Phys. 2014, 151 (2014). https://doi.org/10.1007/JHEP01(2014)151
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP01(2014)151