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Single top and Higgs associated production as a probe of the \(Ht\overline{t}\) coupling sign at the LHC

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Abstract

The LHC sensitivity to an anomalous Higgs coupling to the top quark in the Higgs-top associated production is analyzed. Thanks to the strong 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 nonstandard top-Higgs coupling. We analyze cross sections and the main irreducible backgrounds for the H → γγ decay channel. Sensitivities to an anomalous sign for the top Yukawa coupling are found to be large. In particular, at \(\sqrt{s}=14\;\mathrm{TeV}\), assuming a universal rescaling in the Yukawa sector, a parton-level analysis with realistic selection cuts gives a signal-to-background ratio S/B ~ 5, for \(-1.5\lesssim {{{{Y_t}}} \left/ {{Y_t^{SM}\lesssim 0}} \right.}\). A number of events S ≃ 10 (with corresponding significances ~ 3 σ) are expected for 60 fb−1, to be compared with the standard-model expectation S ~ 0.3.

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References

  1. 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].

    ADS  Google Scholar 

  2. 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].

    ADS  Google Scholar 

  3. 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].

    ADS  Google Scholar 

  4. E. Gabrielli and B. Mele, Testing Effective Yukawa Couplings in Higgs Searches at the Tevatron and LHC, Phys. Rev. D 82 (2010) 113014 [Erratum ibid. D 83 (2011) 079901] [arXiv:1005.2498] [INSPIRE].

    ADS  Google Scholar 

  5. CDF and D0 collaborations, Evidence for a particle produced in association with weak bosons and decaying to a bottom-antibottom quark pair in Higgs boson searches at the Tevatron, Phys. Rev. Lett. 109 (2012) 071804 [arXiv:1207.6436] [INSPIRE].

    Article  Google Scholar 

  6. W.J. Murray, Higgs searches (ATLAS), talk at the Johns Hopkins 36th Workshop “Latest News on the Fermi scale from LHC and Dark Matter searches”, Arcetri, Florence Italy, October 16-19 2012, http://www.ggi.fi.infn.it//index.php?p=events.inc&id=107.

  7. T. Plehn and M. Rauch, Higgs Couplings after the Discovery, Europhys. Lett. 100 (2012) 11002 [arXiv:1207.6108] [INSPIRE].

    Article  Google Scholar 

  8. A. Azatov, R. Contino and J. Galloway, Model-Independent Bounds on a Light Higgs, JHEP 04 (2012) 127 [arXiv:1202.3415] [INSPIRE].

    Article  ADS  Google Scholar 

  9. J. Espinosa, C. Grojean, M. Muhlleitner and M. Trott, Fingerprinting Higgs Suspects at the LHC, JHEP 05 (2012) 097 [arXiv:1202.3697] [INSPIRE].

    Article  ADS  Google Scholar 

  10. ATLAS collaboration, Coupling properties of the new Higgs-like boson observed with the ATLAS detector at the LHC, ATLAS-CONF-2012-127 (2012).

  11. CMS collaboration, Observation of a resonance with a mass near 125 GeV in the search for the Higgs boson in pp collisions at \(\sqrt{s}=7\;TeV\) and 8 TeV, CMS-PAS-HIG-12-020 (2012).

  12. 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].

    Article  ADS  Google Scholar 

  13. M. Reece, Vacuum Instabilities with a Wrong-Sign Higgs-Gluon-Gluon Amplitude, arXiv:1208.1765 [INSPIRE].

  14. T. Corbett, O. Eboli, J. Gonzalez-Fraile and M. Gonzalez-Garcia, Constraining anomalous Higgs interactions, Phys. Rev. D 86 (2012) 075013 [arXiv:1207.1344] [INSPIRE].

    ADS  Google Scholar 

  15. P.P. Giardino, K. Kannike, M. Raidal and A. Strumia, Is the resonance at 125 GeV the Higgs boson?, Phys. Lett. B 718 (2012) 469 [arXiv:1207.1347] [INSPIRE].

    ADS  Google Scholar 

  16. C. Degrande, J. Gerard, C. Grojean, F. Maltoni and G. Servant, Probing Top-Higgs Non-Standard Interactions at the LHC, JHEP 07 (2012) 036 [arXiv:1205.1065] [INSPIRE].

    Article  ADS  Google Scholar 

  17. 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].

    ADS  Google Scholar 

  18. 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].

    ADS  Google Scholar 

  19. A. Ballestrero and E. Maina, \(t\overline{b}\) H production for an intermediate mass Higgs, Phys. Lett. B 299 (1993) 312 [INSPIRE].

    ADS  Google Scholar 

  20. 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].

    ADS  Google Scholar 

  21. 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].

    ADS  Google Scholar 

  22. 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].

    ADS  Google Scholar 

  23. Y. Chang, Search for the scalar boson in the diphoton channel in CMS, talk given at the Conference Higgs Hunting 2012, LAL, Orsay France, July 18-20 2012, http://indico2.lal.in2p3.fr/indico/conferenceDisplay.py?confId=1747.

  24. K. Peters, Search for the scalar boson in the diphoton channel in ATLAS, talk given at the Conference Higgs Hunting 2012, LAL, Orsay France, July 18-20 2012, http://indico2.lal.in2p3.fr/indico/conferenceDisplay.py?confId=1747.

  25. E. Gabrielli, F. Maltoni, B. Mele, M. Moretti, F. Piccinini, et al., Higgs Boson Production in Association with a Photon in Vector Boson Fusion at the LHC, Nucl. Phys. B 781 (2007) 64 [hep-ph/0702119] [INSPIRE].

    Article  ADS  Google Scholar 

  26. J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: Going Beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].

    Article  ADS  Google Scholar 

  27. J. Pumplin, D. Stump, J. Huston, H. Lai, P.M. Nadolsky and W. K. Tung, New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].

    Article  ADS  Google Scholar 

  28. 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].

    Google Scholar 

  29. Particle Data Group collaboration, J. Beringer et al., Review of Particle Physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].

    ADS  Google Scholar 

  30. 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].

    Article  ADS  MATH  Google Scholar 

  31. A. Djouadi, The anatomy of electro-weak symmetry breaking. I: the Higgs boson in the standard model, Phys. Rept. 457 (2008) 1 [hep-ph/0503172] [INSPIRE].

    Article  ADS  Google Scholar 

  32. ATLAS collaboration, Commissioning of the ATLAS high-performance b-tagging algorithms in the 7 TeV collision data, ATLAS-CONF-2011-102 (2011).

  33. K. Tackmann, Search for the Higgs boson in the diphoton decay channel with the ATLAS detector, talk at the Conference ICHEP 2012, Melbourne Australia, July 4-11 2012, http://indico.cern.ch/conferenceProgram.py?confId=181298.

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Authors and Affiliations

  1. INFN, Sezione di Roma, c/o Dipartimanto di Fisica, Università di Roma “La Sapienza”, Piazzale Aldo Moro 2, I-00185, Rome, Italy

    Sanjoy Biswas & Barbara Mele

  2. NICPB, Ravala 10, Tallinn, 10143, Estonia

    Emidio Gabrielli

  3. INFN, Sezione di Trieste, Via Valerio 2, I-34127, Trieste, Italy

    Emidio Gabrielli

Authors
  1. Sanjoy Biswas
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  2. Emidio Gabrielli
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  3. Barbara Mele
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Correspondence to Barbara Mele.

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ArXiv ePrint: 1211.0499

On leave of absence from Dipartimento di Fisica, Università di Trieste, Strada Costiera 11, I-34151 Trieste, Italy. (Emidio Gabrielli)

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Biswas, S., Gabrielli, E. & Mele, B. Single top and Higgs associated production as a probe of the \(Ht\overline{t}\) coupling sign at the LHC. J. High Energ. Phys. 2013, 88 (2013). https://doi.org/10.1007/JHEP01(2013)088

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  • DOI: https://doi.org/10.1007/JHEP01(2013)088

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