Searches for new vector like quarks: Higgs channels



New vector-like quarks can mix sizeably with first generation Standard Model quarks without conflicting with current experimental constraints. Searches for such new quarks have been performed in pair production and electroweak single production channels with subsequent decays into electroweak gauge bosons. To fully explore the underlying structure of the theory the channels with heavy quark decays into Higgs bosons are crucial and in this article we consider for the first time the LHC reach for such channels. The two main production mechanisms involve single production of new quarks through the fusion of a vector boson and the Higgs and single production in association with a Higgs boson. We show that both channels have promising reach at the LHC and that they complement the current direct searches involving decays into electroweak gauge bosons.


Higgs Physics Heavy Quark Physics 


  1. [1]
    F. del Aguila and M.J. Bowick, The possibility of new fermions with ΔI = 0 mass, Nucl. Phys. B 224 (1983) 107 [INSPIRE].ADSCrossRefGoogle Scholar
  2. [2]
    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].CrossRefGoogle Scholar
  3. [3]
    M.S. Carena, E. Ponton, J. Santiago and C.E. Wagner, Light Kaluza Klein states in Randall-Sundrum models with custodial SU(2), Nucl. Phys. B 759 (2006) 202 [hep-ph/0607106] [INSPIRE].MathSciNetADSCrossRefGoogle Scholar
  4. [4]
    M.S. Carena, E. Ponton, J. Santiago and C. Wagner, Electroweak constraints on warped models with custodial symmetry, Phys. Rev. D 76 (2007) 035006 [hep-ph/0701055] [INSPIRE].ADSGoogle Scholar
  5. [5]
    A. Atre, M. Carena, T. Han and J. Santiago, Heavy quarks above the top at the Tevatron, Phys. Rev. D 79 (2009) 054018 [arXiv:0806.3966] [INSPIRE].ADSGoogle Scholar
  6. [6]
    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].ADSGoogle Scholar
  7. [7]
    M. Redi and A. Weiler, Flavor and CP invariant composite Higgs models, JHEP 11 (2011) 108 [arXiv:1106.6357] [INSPIRE].ADSCrossRefGoogle Scholar
  8. [8]
    A. Atre et al., Model-independent searches for new quarks at the LHC, JHEP 08 (2011) 080 [arXiv:1102.1987] [INSPIRE].ADSCrossRefGoogle Scholar
  9. [9]
    ATLAS collaboration, Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Phys. Lett. B 712 (2012) 22 [arXiv:1112.5755] [INSPIRE].ADSGoogle Scholar
  10. [10]
    ATLAS collaboration, Search for single production of vector-like quarks coupling to light generations in 4.64 fb−1 of data at \( \sqrt{s}=7 \) TeV, ATLAS-COM-CONF-2012-167, CERN, Geneva Switzerland (2012) [ATLAS-CONF-2012-137].
  11. [11]
    A. Carmona, M. Chala and J. Santiago, New Higgs production mechanism in composite Higgs models, JHEP 07 (2012) 049 [arXiv:1205.2378] [INSPIRE].ADSCrossRefGoogle Scholar
  12. [12]
    ATLAS collaboration, Search for pair-produced heavy quarks decaying to W q in the two-lepton channel at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Phys. Rev. D 86 (2012) 012007 [arXiv:1202.3389] [INSPIRE].ADSGoogle Scholar
  13. [13]
    F. del Aguila, A. Carmona and J. Santiago, Tau custodian searches at the LHC, Phys. Lett. B 695 (2011) 449 [arXiv:1007.4206] [INSPIRE].ADSGoogle Scholar
  14. [14]
    A. Carmona and F. Goertz, Custodial leptons and Higgs decays, arXiv:1301.5856 [INSPIRE].
  15. [15]
    U. Baur, T. Plehn and D.L. Rainwater, Probing the Higgs selfcoupling at hadron colliders using rare decays, Phys. Rev. D 69 (2004) 053004 [hep-ph/0310056] [INSPIRE].ADSGoogle Scholar
  16. [16]
    M.J. Dolan, C. Englert and M. Spannowsky, Higgs self-coupling measurements at the LHC, JHEP 10 (2012) 112 [arXiv:1206.5001] [INSPIRE].ADSCrossRefGoogle Scholar
  17. [17]
    R. Grober and M. Muhlleitner, Composite Higgs boson pair production at the LHC, JHEP 06 (2011) 020 [arXiv:1012.1562] [INSPIRE].ADSCrossRefGoogle Scholar
  18. [18]
    R. Contino et al., Anomalous couplings in double Higgs production, JHEP 08 (2012) 154 [arXiv:1205.5444] [INSPIRE].ADSCrossRefGoogle Scholar
  19. [19]
    M.J. Dolan, C. Englert and M. Spannowsky, New physics in LHC Higgs boson pair production, Phys. Rev. D 87 (2013) 055002 [arXiv:1210.8166] [INSPIRE].ADSGoogle Scholar
  20. [20]
    J. Alwall et al., MadGraph/MadEvent v4: the new web generation, JHEP 09 (2007) 028 [arXiv:0706.2334] [INSPIRE].ADSCrossRefGoogle Scholar
  21. [21]
    M.L. Mangano, M. Moretti, F. Piccinini, R. Pittau and A.D. Polosa, ALPGEN, a generator for hard multiparton processes in hadronic collisions, JHEP 07 (2003) 001 [hep-ph/0206293] [INSPIRE].ADSCrossRefGoogle Scholar
  22. [22]
    T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006)026 [hep-ph/0603175] [INSPIRE].ADSCrossRefGoogle Scholar
  23. [23]
    S. Ovyn, X. Rouby and V. Lemaitre, DELPHES, a framework for fast simulation of a generic collider experiment, arXiv:0903.2225 [INSPIRE].
  24. [24]
    F. Hubaut, E. Monnier, P. Pralavorio, K. Smolek and V. Simak, ATLAS sensitivity to top quark and W boson polarization in \( t\overline{t} \) events, Eur. Phys. J. C 44S2 (2005) 13 [hep-ex/0508061] [INSPIRE].
  25. [25]
    F. Hubaut, E. Monnier, P. Pralavorio, B. Resende and C. Zhu, Comparison between full and fast simulations in top physics, (2006).Google Scholar
  26. [26]
    N. Castro, Study of the W tb vertex structure at the ATLAS experiment, Ph.D. thesis, Univ. Coimbra, Coimbra Portugal (2008) [CERN-THESIS-2008-083] [INSPIRE].
  27. [27]
    J. Pumplin et al., New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].ADSCrossRefGoogle Scholar

Copyright information

© SISSA, Trieste, Italy 2013

Authors and Affiliations

  1. 1.Department of Physics and AstronomyMichigan State UniversityEast LansingU.S.A
  2. 2.CAFPE and Departamento de Física Teórica y del CosmosUniversity of GranadaGranadaSpain

Personalised recommendations