Abstract
The LHC experiments have analyzed the 7 and 8 TeV LHC data in the main Higgs production and decay modes. Current analyses only loosely constrain an anomalous top-Higgs coupling in a direct way. In order to strongly constrain this coupling, the Higgs-top associated production is reanalyzed. Thanks to the large destructive interference in the t-channel for standard model couplings, this process can be very sensitive to both the magnitude and the sign of a non-standard top-Higgs coupling. We project the sensitivity to anomalous couplings to the integrated luminosity of 50 fb−1, corresponding to the data collected by the ATLAS and CMS experiments in 7 and 8 TeV collisions, as of 2012. We show that the combination of diphoton and multi-lepton signatures, originating from different combinations of the top and Higgs decay modes, can be a potential probe to constrain a large portion of the negative top-Higgs coupling space presently allowed by the ATLAS and CMS global fits.
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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].
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].
ATLAS collaboration, Coupling properties of the new Higgs-like boson observed with the ATLAS detector at the LHC, ATLAS-CONF-2012-127, CERN, Geneva Switzerland (2012).
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, CERN, Geneva Switzerland (2013).
CMS collaboration, Combination of Standard Model Higgs boson searches and measurements of the properties of the new boson with a mass near 125 GeV, CMS-PAS-HIG-12-045, CERN, Geneva Switzerland (2012).
CDF and D0 collaborations, Higgs boson studies at the Tevatron, arXiv:1303.6346 [INSPIRE].
J. Espinosa, C. Grojean, M. Muhlleitner and M. Trott, Fingerprinting Higgs suspects at the LHC, JHEP 05 (2012) 097 [arXiv:1202.3697] [INSPIRE].
A. Azatov et al., Determining Higgs couplings with a model-independent analysis of h → γγ, JHEP 06 (2012) 134 [arXiv:1204.4817] [INSPIRE].
P.P. Giardino, K. Kannike, I. Masina, M. Raidal and A. Strumia, The universal Higgs fit, arXiv:1303.3570 [INSPIRE].
T. Alanne, S. Di Chiara and K. Tuominen, LHC data and aspects of new physics, arXiv:1303.3615 [INSPIRE].
J. Ellis and T. You, Updated global analysis of Higgs couplings, JHEP 06 (2013) 103 [arXiv:1303.3879] [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, arXiv:1303.6591 [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, arXiv:1303.1812 [INSPIRE].
S. Biswas, E. Gabrielli and B. Mele, Single top and Higgs associated production as a probe of the Htt coupling sign at the LHC, JHEP 01 (2013) 088 [arXiv:1211.0499] [INSPIRE].
M. Farina, C. Grojean, F. Maltoni, E. Salvioni and A. Thamm, Lifting degeneracies in Higgs couplings using single top production in association with a Higgs boson, JHEP 05 (2013) 022 [arXiv:1211.3736] [INSPIRE].
W.J. Stirling and D. Summers, Production of an intermediate mass Higgs boson in association with a single top quark at LHC and SSC, Phys. Lett. B 283 (1992) 411 [INSPIRE].
A. Ballestrero and E. Maina, \( t\overline{b}H \) production for an intermediate mass Higgs, Phys. Lett. B 299 (1993) 312 [INSPIRE].
G. Bordes and B. van Eijk, On the associate production of a neutral intermediate mass Higgs boson with a single top quark at the LHC and SSC, Phys. Lett. B 299 (1993) 315 [INSPIRE].
T.M. Tait and C.-P. Yuan, Single top quark production as a window to physics beyond the Standard Model, Phys. Rev. D 63 (2000) 014018 [hep-ph/0007298] [INSPIRE].
F. Maltoni, K. Paul, T. Stelzer and S. Willenbrock, Associated production of Higgs and single top at hadron colliders, Phys. Rev. D 64 (2001) 094023 [hep-ph/0106293] [INSPIRE].
V. Barger, M. McCaskey and G. Shaughnessy, Single top and Higgs associated production at the LHC, Phys. Rev. D 81 (2010) 034020 [arXiv:0911.1556] [INSPIRE].
J. Campbell, R.K. Ellis and R. Röntsch, Single top production in association with a Z boson at the LHC, arXiv:1302.3856 [INSPIRE].
T. Appelquist and M.S. Chanowitz, Unitarity bound on the scale of fermion mass generation, Phys. Rev. Lett. 59 (1987) 2405 [Erratum ibid. 60 (1988) 1589] [INSPIRE].
J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].
J. Pumplin et al., New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].
CDF and D0 collaborations, Combination of the top-quark mass measurements from the Tevatron collider, Phys. Rev. D 86 (2012) 092003 [arXiv:1207.1069] [INSPIRE].
Particle Data Group collaboration, J. Beringer et al., Review of particle physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].
A. Djouadi, J. Kalinowski and M. Spira, HDECAY: a program for Higgs boson decays in the Standard Model and its supersymmetric extension, Comput. Phys. Commun. 108 (1998) 56 [hep-ph/9704448] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
CMS collaboration, Measurement of associated production of vector bosons and top quark-antiquark pairs at \( \sqrt{s}=7 \) TeV, Phys. Rev. Lett. 110 (2013) 172002 [arXiv:1303.3239] [INSPIRE].
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ArXiv ePrint: 1304.1822
On leave of absence from Dipart. di Fisica, Università di Trieste, Strada Costiera 11, I-34151 Trieste, Italy. (Emidio Gabrielli)
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Biswas, S., Gabrielli, E., Margaroli, F. et al. Direct constraints on the top-Higgs coupling from the 8 TeV LHC data. J. High Energ. Phys. 2013, 73 (2013). https://doi.org/10.1007/JHEP07(2013)073
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DOI: https://doi.org/10.1007/JHEP07(2013)073