Abstract
As the Higgs boson properties settle, the constraints on the Standard Model extensions tighten. We consider all possible new fermions that can couple to the Higgs, inspecting sets of up to four chiral multiplets. We confront them with direct collider searches, electroweak precision tests, and current knowledge of the Higgs couplings. The focus is on scenarios that may depart from the decoupling limit of very large masses and vanishing mixing, as they offer the best prospects for detection. We identify exotic chiral families that may receive a mass from the Higgs only, still in agreement with the hγγ signal strength. A mixing θ between the Standard Model and non-chiral fermions induces order θ 2 deviations in the Higgs couplings. The mixing can be as large as θ ∼ 0.5 in case of custodial protection of the Z couplings or accidental cancellation in the oblique parameters. We also notice some intriguing effects for much smaller values of θ, especially in the lepton sector. Our survey includes a number of unconventional pairs of vector-like and Majorana fermions coupled through the Higgs, that may induce order one corrections to the Higgs radiative couplings. We single out the regions of parameters where hγγ and hgg are unaffected, while the hγZ signal strength is significantly modified, turning a few times larger than in the Standard Model in two cases. The second run of the LHC will effectively test most of these scenarios.
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References
H. Flacher, M. Goebel, J. Haller, A. Hocker, K. Monig and J. Stelzer, Revisiting the Global Electroweak Fit of the Standard Model and Beyond with Gfitter, Eur. Phys. J. C 60 (2009) 543 [Erratum ibid. C 71 (2011) 1718] [arXiv:0811.0009] [INSPIRE].
DELPHI, OPAL, LEP Electroweak, ALEPH and L3 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].
Particle Data Group collaboration, K.A. Olive et al., Review of Particle Physics, Chin. Phys. C 38 (2014) 090001 [INSPIRE].
M. Raidal et al., Flavour physics of leptons and dipole moments, Eur. Phys. J. C 57 (2008) 13 [arXiv:0801.1826] [INSPIRE].
G. Isidori, Y. Nir and G. Perez, Flavor Physics Constraints for Physics Beyond the Standard Model, Ann. Rev. Nucl. Part. Sci. 60 (2010) 355 [arXiv:1002.0900] [INSPIRE].
D. Toback and L. ŽIvković, Review of Physics Results from the Tevatron: Searches for New Particles and Interactions, Int. J. Mod. Phys. A 30 (2015) 1541007 [arXiv:1409.4910] [INSPIRE].
Particle Data Group collaboration, K. Nakamura et al., Review of particle physics, J. Phys. G 37 (2010) 075021 [INSPIRE].
ATLAS collaboration, https://twiki.cern.ch/twiki/bin/view/AtlasPublic.
CMS collaboration, http://cms-results.web.cern.ch/cms-results/public-results/publications/.
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].
CMS collaboration, Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV, Eur. Phys. J. C 75 (2015) 212 [arXiv:1412.8662] [INSPIRE].
ATLAS and CMS collaborations, Combined Measurement of the Higgs Boson Mass in pp Collisions at \( \sqrt{s}=7 \) and 8 TeV with the ATLAS and CMS Experiments, Phys. Rev. Lett. 114 (2015) 191803 [arXiv:1503.07589] [INSPIRE].
ATLAS collaboration, Measurements of the Higgs boson production and decay rates and coupling strengths using pp collision data at \( \sqrt{s}=7 \) and 8 TeV in the ATLAS experiment, arXiv:1507.04548 [INSPIRE].
SLD Electroweak Group, DELPHI, ALEPH, SLD, SLD Heavy Flavour Group, OPAL, LEP Electroweak Working Group and L3 collaborations, S. Schael et al., Precision electroweak measurements on the Z resonance, Phys. Rept. 427 (2006) 257 [hep-ex/0509008] [INSPIRE].
D.B. Kaplan, Flavor at SSC energies: A New mechanism for dynamically generated fermion masses, Nucl. Phys. B 365 (1991) 259 [INSPIRE].
R. Contino and A. Pomarol, Holography for fermions, JHEP 11 (2004) 058 [hep-th/0406257] [INSPIRE].
M. Cirelli, N. Fornengo and A. Strumia, Minimal dark matter, Nucl. Phys. B 753 (2006) 178 [hep-ph/0512090] [INSPIRE].
E. Del Nobile, R. Franceschini, D. Pappadopulo and A. Strumia, Minimal Matter at the Large Hadron Collider, Nucl. Phys. B 826 (2010) 217 [arXiv:0908.1567] [INSPIRE].
L. Di Luzio, R. Gröber, J.F. Kamenik and M. Nardecchia, Accidental matter at the LHC, JHEP 07 (2015) 074 [arXiv:1504.00359] [INSPIRE].
I. Picek and B. Radovcic, Nondecoupling of terascale isosinglet quark and rare K- and B-decays, Phys. Rev. D 78 (2008) 015014 [arXiv:0804.2216] [INSPIRE].
G. Cacciapaglia, A. Deandrea, L. Panizzi, N. Gaur, D. Harada and Y. Okada, Heavy Vector-like Top Partners at the LHC and flavour constraints, JHEP 03 (2012) 070 [arXiv:1108.6329] [INSPIRE].
C. Han, A. Kobakhidze, N. Liu, L. Wu and B. Yang, Constraining Top partner and Naturalness at the LHC and TLEP, Nucl. Phys. B 890 (2014) 388 [arXiv:1405.1498] [INSPIRE].
E. Witten, An SU(2) Anomaly, Phys. Lett. B 117 (1982) 324 [INSPIRE].
O. Eberhardt et al., Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations, Phys. Rev. Lett. 109 (2012) 241802 [arXiv:1209.1101] [INSPIRE].
A. Azatov et al., Higgs boson production via vector-like top-partner decays: Diphoton or multilepton plus multijets channels at the LHC, Phys. Rev. D 85 (2012) 115022 [arXiv:1204.0455] [INSPIRE].
M. Montull, F. Riva, E. Salvioni and R. Torre, Higgs Couplings in Composite Models, Phys. Rev. D 88 (2013) 095006 [arXiv:1308.0559] [INSPIRE].
T. Flacke, J.H. Kim, S.J. Lee and S.H. Lim, Constraints on composite quark partners from Higgs searches, JHEP 05 (2014) 123 [arXiv:1312.5316] [INSPIRE].
C.-Y. Chen, S. Dawson and I.M. Lewis, Top Partners and Higgs Boson Production, Phys. Rev. D 90 (2014) 035016 [arXiv:1406.3349] [INSPIRE].
O. Matsedonskyi, G. Panico and A. Wulzer, On the Interpretation of Top Partners Searches, JHEP 12 (2014) 097 [arXiv:1409.0100] [INSPIRE].
ATLAS collaboration, Searches for heavy long-lived sleptons and R-Hadrons with the ATLAS detector in pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Lett. B 720 (2013) 277 [arXiv:1211.1597] [INSPIRE].
CMS collaboration, Searches for long-lived charged particles in pp collisions at \( \sqrt{s}=7 \) and 8 TeV, JHEP 07 (2013) 122 [arXiv:1305.0491] [INSPIRE].
ATLAS collaboration, Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at \( \sqrt{s}=8 \) TeV, JHEP 01 (2015) 068 [arXiv:1411.6795] [INSPIRE].
M. Fairbairn, A.C. Kraan, D.A. Milstead, T. Sjöstrand, P.Z. Skands and T. Sloan, Stable massive particles at colliders, Phys. Rept. 438 (2007) 1 [hep-ph/0611040] [INSPIRE].
ATLAS and CMS collaborations, Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at \( \sqrt{s}=7 \) and 8 TeV, ATLAS-CONF-2015-044 (2015).
S. Banerjee, M. Frank and S.K. Rai, Higgs data confronts Sequential Fourth Generation Fermions in the Higgs Triplet Model, Phys. Rev. D 89 (2014) 075005 [arXiv:1312.4249] [INSPIRE].
A. Alves, E. Ramirez Barreto, D.A. Camargo and A.G. Dias, A Model with Chiral Quarks of Electric Charges -4/3 and 5/3, JHEP 07 (2013) 129 [arXiv:1306.1275] [INSPIRE].
ATLAS collaboration, Search for heavy long-lived multi-charged particles in pp collisions at \( \sqrt{s}=8 \) TeV using the ATLAS detector, Eur. Phys. J. C 75 (2015) 362 [arXiv:1504.04188] [INSPIRE].
ATLAS collaboration, Search for Massive Long-lived Highly Ionising Particles with the ATLAS Detector at the LHC, Phys. Lett. B 698 (2011) 353 [arXiv:1102.0459] [INSPIRE].
D. Wyler and L. Wolfenstein, Massless Neutrinos in Left-Right Symmetric Models, Nucl. Phys. B 218 (1983) 205 [INSPIRE].
R.N. Mohapatra and J.W.F. Valle, Neutrino Mass and Baryon Number Nonconservation in Superstring Models, Phys. Rev. D 34 (1986) 1642 [INSPIRE].
M.C. Gonzalez-Garcia and J.W.F. Valle, Fast Decaying Neutrinos and Observable Flavor Violation in a New Class of Majoron Models, Phys. Lett. B 216 (1989) 360 [INSPIRE].
S.S.C. Law and K.L. McDonald, Generalized inverse seesaw mechanisms, Phys. Rev. D 87 (2013) 113003 [arXiv:1303.4887] [INSPIRE].
A. de Gouvêa, GeV seesaw, accidentally small neutrino masses and Higgs decays to neutrinos, arXiv:0706.1732 [INSPIRE].
J.-H. Chen, X.-G. He, J. Tandean and L.-H. Tsai, Effect on Higgs Boson Decays from Large Light-Heavy Neutrino Mixing in Seesaw Models, Phys. Rev. D 81 (2010) 113004 [arXiv:1001.5215] [INSPIRE].
P.S. Bhupal Dev, R. Franceschini and R.N. Mohapatra, Bounds on TeV Seesaw Models from LHC Higgs Data, Phys. Rev. D 86 (2012) 093010 [arXiv:1207.2756] [INSPIRE].
C.G. Cely, A. Ibarra, E. Molinaro and S.T. Petcov, Higgs Decays in the Low Scale Type I See-Saw Model, Phys. Lett. B 718 (2013) 957 [arXiv:1208.3654] [INSPIRE].
S. Antusch and O. Fischer, Testing sterile neutrino extensions of the Standard Model at future lepton colliders, JHEP 05 (2015) 053 [arXiv:1502.05915] [INSPIRE].
ATLAS collaboration, Search for Majorana neutrino production in pp collisions at \( \sqrt{s}=7 \) TeV in dimuon final states with the ATLAS detector, ATLAS-CONF-2012-139 (2012).
ATLAS collaboration, Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 07 (2015) 162 [arXiv:1506.06020] [INSPIRE].
CMS collaboration, Search for heavy Majorana neutrinos in μ ± μ ±+ jets and e ± e ±+ jets events in pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Lett. B 717 (2012) 109 [arXiv:1207.6079] [INSPIRE].
CMS collaboration, Search for heavy Majorana neutrinos in μ ± μ ±+ jets events in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Phys. Lett. B 748 (2015) 144 [arXiv:1501.05566] [INSPIRE].
A. Abada, C. Biggio, F. Bonnet, M.B. Gavela and T. Hambye, μ → eγ and τ → lγ decays in the fermion triplet seesaw model, Phys. Rev. D 78 (2008) 033007 [arXiv:0803.0481] [INSPIRE].
A. Abada, C. Biggio, F. Bonnet, M.B. Gavela and T. Hambye, Low energy effects of neutrino masses, JHEP 12 (2007) 061 [arXiv:0707.4058] [INSPIRE].
R. Franceschini, T. Hambye and A. Strumia, Type-III see-saw at LHC, Phys. Rev. D 78 (2008) 033002 [arXiv:0805.1613] [INSPIRE].
L3 collaboration, P. Achard et al., Search for heavy neutral and charged leptons in e + e − annihilation at LEP, Phys. Lett. B 517 (2001) 75 [hep-ex/0107015] [INSPIRE].
CMS collaboration, Search for heavy lepton partners of neutrinos in proton-proton collisions in the context of the type-III seesaw mechanism, Phys. Lett. B 718 (2013) 348 [arXiv:1210.1797] [INSPIRE].
ATLAS collaboration, Search for type-III Seesaw heavy leptons in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS Detector, Phys. Rev. D 92 (2015) 032001 [arXiv:1506.01839] [INSPIRE].
A. Falkowski, D.M. Straub and A. Vicente, Vector-like leptons: Higgs decays and collider phenomenology, JHEP 05 (2014) 092 [arXiv:1312.5329] [INSPIRE].
W. Altmannshofer, M. Bauer and M. Carena, Exotic Leptons: Higgs, Flavor and Collider Phenomenology, JHEP 01 (2014) 060 [arXiv:1308.1987] [INSPIRE].
T. Ma, B. Zhang and G. Cacciapaglia, Doubly Charged Lepton from an Exotic Doublet at the LHC, Phys. Rev. D 89 (2014) 093022 [arXiv:1404.2375] [INSPIRE].
A. Delgado, C. Garcia Cely, T. Han and Z. Wang, Phenomenology of a lepton triplet, Phys. Rev. D 84 (2011) 073007 [arXiv:1105.5417] [INSPIRE].
T. Ma, B. Zhang and G. Cacciapaglia, Triplet with a doubly-charged lepton at the LHC, Phys. Rev. D 89 (2014) 015020 [arXiv:1309.7396] [INSPIRE].
ATLAS collaboration, Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector, JHEP 04 (2015) 117 [arXiv:1501.04943] [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 lepton-flavour-violating H → μτ decays of the Higgs boson with the ATLAS detector, arXiv:1508.03372 [INSPIRE].
CMS collaboration, Search for Lepton-Flavour-Violating Decays of the Higgs Boson, Phys. Lett. B 749 (2015) 337 [arXiv:1502.07400] [INSPIRE].
ATLAS collaboration, Search for the Standard Model Higgs boson decay to μ + μ − with the ATLAS detector, Phys. Lett. B 738 (2014) 68 [arXiv:1406.7663] [INSPIRE].
CMS collaboration, Search for a standard model-like Higgs boson in the μ + μ − and e + e − decay channels at the LHC, Phys. Lett. B 744 (2015) 184 [arXiv:1410.6679] [INSPIRE].
K. Agashe, R. Contino, L. Da Rold and A. Pomarol, A Custodial symmetry for \( Zb\overline{b} \), Phys. Lett. B 641 (2006) 62 [hep-ph/0605341] [INSPIRE].
F. del Aguila, A. Carmona and J. Santiago, Tau Custodian searches at the LHC, Phys. Lett. B 695 (2011) 449 [arXiv:1007.4206] [INSPIRE].
A. Carmona and F. Goertz, Custodial Leptons and Higgs Decays, JHEP 04 (2013) 163 [arXiv:1301.5856] [INSPIRE].
L.G. Almeida, E. Bertuzzo, P.A.N. Machado and R.Z. Funchal, Does H → γγ Taste like vanilla New Physics?, JHEP 11 (2012) 085 [arXiv:1207.5254] [INSPIRE].
J. Kearney, A. Pierce and N. Weiner, Vectorlike Fermions and Higgs Couplings, Phys. Rev. D 86 (2012) 113005 [arXiv:1207.7062] [INSPIRE].
A. Joglekar, P. Schwaller and C.E.M. Wagner, Dark Matter and Enhanced Higgs to Di-photon Rate from Vector-like Leptons, JHEP 12 (2012) 064 [arXiv:1207.4235] [INSPIRE].
M. Redi, Leptons in Composite MFV, JHEP 09 (2013) 060 [arXiv:1306.1525] [INSPIRE].
S.P. Martin, A Supersymmetry primer, hep-ph/9709356 [INSPIRE].
H.K. Dreiner, J.S. Kim and O. Lebedev, First LHC Constraints on Neutralinos, Phys. Lett. B 715 (2012) 199 [arXiv:1206.3096] [INSPIRE].
B. Ananthanarayan, J. Lahiri, P.N. Pandita and M. Patra, Invisible decays of the lightest Higgs boson in supersymmetric models, Phys. Rev. D 87 (2013) 115021 [arXiv:1306.1291] [INSPIRE].
J.A. Casas, J.M. Moreno, K. Rolbiecki and B. Zaldivar, Implications of light charginos for Higgs observables, LHC searches and dark matter, JHEP 09 (2013) 099 [arXiv:1305.3274] [INSPIRE].
B. Batell, S. Jung and C.E.M. Wagner, Very Light Charginos and Higgs Decays, JHEP 12 (2013) 075 [arXiv:1309.2297] [INSPIRE].
F. del Aguila, M. Pérez-Victoria and J. Santiago, Observable contributions of new exotic quarks to quark mixing, JHEP 09 (2000) 011 [hep-ph/0007316] [INSPIRE].
J.A. Aguilar-Saavedra, Identifying top partners at LHC, JHEP 11 (2009) 030 [arXiv:0907.3155] [INSPIRE].
G. Cacciapaglia, A. Deandrea, D. Harada and Y. Okada, Bounds and Decays of New Heavy Vector-like Top Partners, JHEP 11 (2010) 159 [arXiv:1007.2933] [INSPIRE].
S. Gopalakrishna, T. Mandal, S. Mitra and R. Tibrewala, LHC Signatures of a Vector-like b’, Phys. Rev. D 84 (2011) 055001 [arXiv:1107.4306] [INSPIRE].
Y. Okada and L. Panizzi, LHC signatures of vector-like quarks, Adv. High Energy Phys. 2013 (2013) 364936 [arXiv:1207.5607] [INSPIRE].
J.A. Aguilar-Saavedra, R. Benbrik, S. Heinemeyer and M. Pérez-Victoria, Handbook of vectorlike quarks: Mixing and single production, Phys. Rev. D 88 (2013) 094010 [arXiv:1306.0572] [INSPIRE].
S. Gopalakrishna, T. Mandal, S. Mitra and G. Moreau, LHC Signatures of Warped-space Vectorlike Quarks, JHEP 08 (2014) 079 [arXiv:1306.2656] [INSPIRE].
ATLAS collaboration, Search for production of vector-like quark pairs and of four top quarks in the lepton plus jets final state in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, ATLAS-CONF-2015-012 (2015).
CMS collaboration, Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure, JHEP 06 (2015) 080 [arXiv:1503.01952] [INSPIRE].
ATLAS collaboration, Search for vectorlike B quarks in events with one isolated lepton, missing transverse momentum and jets at \( \sqrt{s}=8 \) TeV with the ATLAS detector, Phys. Rev. D 91 (2015) 112011 [arXiv:1503.05425] [INSPIRE].
ATLAS collaboration, Search for pair and single production of new heavy quarks that decay to a Z boson and a third-generation quark in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 11 (2014) 104 [arXiv:1409.5500] [INSPIRE].
CMS collaboration, Search for vector-like quarks in final states with a single lepton and jets in pp collisions at \( \sqrt{s}=8 \) TeV, CMS-PAS-B2G-12-017 (2012).
CMS collaboration, Search for pair-produced vector-like quarks of charge -1/3 decaying to bH using boosted Higgs jet-tagging in pp collisions at \( \sqrt{s}=8 \) TeV, (2014).
CMS collaboration, Search for pair-produced vector-like quarks of charge -1/3 in lepton+jets final state in pp collisions at \( \sqrt{s}=8 \) TeV, (2012).
CMS collaboration, Search for Vector-Like Charge 2/3 T Quarks in Proton-Proton Collisions at \( \sqrt{s}=8 \) TeV, arXiv:1509.04177 [INSPIRE].
R. Contino, L. Da Rold and A. Pomarol, Light custodians in natural composite Higgs models, Phys. Rev. D 75 (2007) 055014 [hep-ph/0612048] [INSPIRE].
A. Pomarol and J. Serra, Top Quark Compositeness: Feasibility and Implications, Phys. Rev. D 78 (2008) 074026 [arXiv:0806.3247] [INSPIRE].
E. Bertuzzo, P.A.N. Machado and R. Zukanovich Funchal, Can New Colored Particles Illuminate the Higgs?, JHEP 02 (2013) 086 [arXiv:1209.6359] [INSPIRE].
O. Matsedonskyi, F. Riva and T. Vantalon, Composite Charge 8/3 Resonances at the LHC, JHEP 04 (2014) 059 [arXiv:1401.3740] [INSPIRE].
G. Cacciapaglia, A. Deandrea, N. Gaur, D. Harada, Y. Okada and L. Panizzi, Interplay of vector-like top partner multiplets in a realistic mixing set-up, JHEP 09 (2015) 012 [arXiv:1502.00370] [INSPIRE].
M. Gillioz, A Light composite Higgs boson facing electroweak precision tests, Phys. Rev. D 80 (2009) 055003 [arXiv:0806.3450] [INSPIRE].
A. Azatov and J. Galloway, Light Custodians and Higgs Physics in Composite Models, Phys. Rev. D 85 (2012) 055013 [arXiv:1110.5646] [INSPIRE].
J. Elias-Miró, J.R. 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].
M.E. Peskin and T. Takeuchi, A New constraint on a strongly interacting Higgs sector, Phys. Rev. Lett. 65 (1990) 964 [INSPIRE].
G. Altarelli and R. Barbieri, Vacuum polarization effects of new physics on electroweak processes, Phys. Lett. B 253 (1991) 161 [INSPIRE].
M.E. Peskin and T. Takeuchi, Estimation of oblique electroweak corrections, Phys. Rev. D 46 (1992) 381 [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].
Gfitter Group collaboration, M. Baak et al., The global electroweak fit at NNLO and prospects for the LHC and ILC, Eur. Phys. J. C 74 (2014) 3046 [arXiv:1407.3792] [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].
S. Gori, J. Gu and L.-T. Wang, The Zbb Couplings at Future e + e − Colliders, arXiv:1508.07010 [INSPIRE].
P. Bamert, C.P. Burgess, J.M. Cline, D. London and E. Nardi, R(b) and new physics: A Comprehensive analysis, Phys. Rev. D 54 (1996) 4275 [hep-ph/9602438] [INSPIRE].
J.R. Ellis, M.K. Gaillard and D.V. Nanopoulos, A Phenomenological Profile of the Higgs Boson, Nucl. Phys. B 106 (1976) 292 [INSPIRE].
M.A. Shifman, A.I. Vainshtein, M.B. Voloshin and V.I. Zakharov, Low-Energy Theorems for Higgs Boson Couplings to Photons, Sov. J. Nucl. Phys. 30 (1979) 711 [INSPIRE].
B.A. Kniehl and M. Spira, Low-energy theorems in Higgs physics, Z. Phys. C 69 (1995) 77 [hep-ph/9505225] [INSPIRE].
M. Carena, I. Low and C.E.M. Wagner, Implications of a Modified Higgs to Diphoton Decay Width, JHEP 08 (2012) 060 [arXiv:1206.1082] [INSPIRE].
M. Gillioz, R. Grober, C. Grojean, M. Muhlleitner and E. Salvioni, Higgs Low-Energy Theorem (and its corrections) in Composite Models, JHEP 10 (2012) 004 [arXiv:1206.7120] [INSPIRE].
M.B. Voloshin, CP Violation in Higgs Diphoton Decay in Models with Vectorlike Heavy Fermions, Phys. Rev. D 86 (2012) 093016 [arXiv:1208.4303] [INSPIRE].
M.B. Gavela, G. Girardi, C. Malleville and P. Sorba, A Nonlinear R(xi) Gauge Condition for the Electroweak SU(2) × U(1) Model, Nucl. Phys. B 193 (1981) 257 [INSPIRE].
R.N. Cahn, M.S. Chanowitz and N. Fleishon, Higgs Particle Production by Z → Hγ, Phys. Lett. B 82 (1979) 113 [INSPIRE].
L. Bergstrom and G. Hulth, Induced Higgs Couplings to Neutral Bosons in e + e − Collisions, Nucl. Phys. B 259 (1985) 137 [Erratum ibid. B 276 (1986) 744] [INSPIRE].
G. Passarino and M.J.G. Veltman, One Loop Corrections for e + e − Annihilation Into μ + μ − in the Weinberg Model, Nucl. Phys. B 160 (1979) 151 [INSPIRE].
D.Y. Bardin and G. Passarino, International Series of Monographs on Physics. Vol. 104: The standard model in the making: Precision study of the electroweak interactions, Clarendon Press, London U.K. (1999).
A. Denner, Techniques for calculation of electroweak radiative corrections at the one loop level and results for W physics at LEP-200, Fortsch. Phys. 41 (1993) 307 [arXiv:0709.1075] [INSPIRE].
A. Djouadi, V. Driesen, W. Hollik and J. Rosiek, Associated production of Higgs bosons and a photon in high-energy e + e − collisions, Nucl. Phys. B 491 (1997) 68 [hep-ph/9609420] [INSPIRE].
A. Djouadi, V. Driesen, W. Hollik and A. Kraft, The Higgs photon — Z boson coupling revisited, Eur. Phys. J. C 1 (1998) 163 [hep-ph/9701342] [INSPIRE].
J. Cao, L. Wu, P. Wu and J.M. Yang, The Z+photon and diphoton decays of the Higgs boson as a joint probe of low energy SUSY models, JHEP 09 (2013) 043 [arXiv:1301.4641] [INSPIRE].
ATLAS collaboration, Projections for measurements of Higgs boson signal strengths and coupling parameters with the ATLAS detector at a HL-LHC, ATL-PHYS-PUB-2014-016 (2014).
CMS collaboration, Projected Performance of an Upgraded CMS Detector at the LHC and HL-LHC: Contribution to the Snowmass Process, arXiv:1307.7135 [INSPIRE].
ATLAS collaboration, Search for Higgs boson decays to a photon and a Z boson in pp collisions at \( \sqrt{s}=7 \) and 8 TeV with the ATLAS detector, Phys. Lett. B 732 (2014) 8 [arXiv:1402.3051] [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 an Invisibly Decaying Higgs Boson Produced via Vector Boson Fusion in pp Collisions at \( \sqrt{s}=8 \) TeV using the ATLAS Detector at the LHC, ATLAS-CONF-2015-004 (2015).
CMS collaboration, Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes, Eur. Phys. J. C 74 (2014) 2980 [arXiv:1404.1344] [INSPIRE].
J.R. Espinosa, C. Grojean, M. Muhlleitner and M. Trott, First Glimpses at Higgs’ face, JHEP 12 (2012) 045 [arXiv:1207.1717] [INSPIRE].
D. Carmi, A. Falkowski, E. Kuflik, T. Volansky and J. Zupan, Higgs After the Discovery: A Status Report, JHEP 10 (2012) 196 [arXiv:1207.1718] [INSPIRE].
G. Cacciapaglia, A. Deandrea, G.D. La Rochelle and J.-B. Flament, Higgs couplings beyond the Standard Model, JHEP 03 (2013) 029 [arXiv:1210.8120] [INSPIRE].
A. Azatov and J. Galloway, Electroweak Symmetry Breaking and the Higgs Boson: Confronting Theories at Colliders, Int. J. Mod. Phys. A 28 (2013) 1330004 [arXiv:1212.1380] [INSPIRE].
A. Falkowski, F. Riva and A. Urbano, Higgs at last, JHEP 11 (2013) 111 [arXiv:1303.1812] [INSPIRE].
P.P. Giardino, K. Kannike, I. Masina, M. Raidal and A. Strumia, The universal Higgs fit, JHEP 05 (2014) 046 [arXiv:1303.3570] [INSPIRE].
A. Djouadi and G. Moreau, The couplings of the Higgs boson and its CP properties from fits of the signal strengths and their ratios at the 7 + 8 TeV LHC, Eur. Phys. J. C 73 (2013) 2512 [arXiv:1303.6591] [INSPIRE].
G. Bélanger, B. Dumont, U. Ellwanger, J.F. Gunion and S. Kraml, Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors, Phys. Rev. D 88 (2013) 075008 [arXiv:1306.2941] [INSPIRE].
G. Moreau, Constraining extra-fermion(s) from the Higgs boson data, Phys. Rev. D 87 (2013) 015027 [arXiv:1210.3977] [INSPIRE].
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Bizot, N., Frigerio, M. Fermionic extensions of the Standard Model in light of the Higgs couplings. J. High Energ. Phys. 2016, 36 (2016). https://doi.org/10.1007/JHEP01(2016)036
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DOI: https://doi.org/10.1007/JHEP01(2016)036