Advertisement

Journal of High Energy Physics

, 2016:153 | Cite as

Phenomenology of strongly coupled chiral gauge theories

  • Yang Bai
  • Joshua Berger
  • James Osborne
  • Ben A. Stefanek
Open Access
Regular Article - Theoretical Physics
  • 79 Downloads

Abstract

A sector with QCD-like strong dynamics is common in models of non-standard physics. Such a model could be accessible in LHC searches if both confinement and big-quarks charged under the confining group are at the TeV scale. Big-quark masses at this scale can be explained if the new fermions are chiral under a new U(1)′ gauge symmetry such that their bare masses are related to the U(1)′-breaking and new confinement scales. Here we present a study of a minimal GUT-motivated and gauge anomaly-free model with implications for the LHC Run 2 searches. We find that the first signatures of such models could appear as two gauge boson resonances. The chiral nature of the model could be confirmed by observation of a Z′γ resonance, where the Z′ naturally has a large leptonic branching ratio because of its kinetic mixing with the hypercharge gauge boson.

Keywords

Beyond Standard Model Technicolor and Composite Models 

Notes

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.

References

  1. [1]
    C.T. Hill and E.H. Simmons, Strong dynamics and electroweak symmetry breaking, Phys. Rept. 381 (2003) 235 [Erratum ibid. 390 (2004) 553] [hep-ph/0203079] [INSPIRE].
  2. [2]
    H.-J. He, N. Polonsky and S.-f. Su, Extra families, Higgs spectrum and oblique corrections, Phys. Rev. D 64 (2001) 053004 [hep-ph/0102144] [INSPIRE].
  3. [3]
    V.A. Novikov, L.B. Okun, A.N. Rozanov and M.I. Vysotsky, Extra generations and discrepancies of electroweak precision data, Phys. Lett. B 529 (2002) 111 [hep-ph/0111028] [INSPIRE].
  4. [4]
    G.D. Kribs, T. Plehn, M. Spannowsky and T.M.P. Tait, Four generations and Higgs physics, Phys. Rev. D 76 (2007) 075016 [arXiv:0706.3718] [INSPIRE].ADSGoogle Scholar
  5. [5]
    J. Erler and P. Langacker, Precision constraints on extra fermion generations, Phys. Rev. Lett. 105 (2010) 031801 [arXiv:1003.3211] [INSPIRE].ADSCrossRefGoogle Scholar
  6. [6]
    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].ADSCrossRefGoogle Scholar
  7. [7]
    Y. Iwasaki, K. Kanaya, S. Kaya, S. Sakai and T. Yoshie, Phase structure of lattice QCD for general number of flavors, Phys. Rev. D 69 (2004) 014507 [hep-lat/0309159] [INSPIRE].
  8. [8]
    T.A. Ryttov and F. Sannino, Conformal windows of SU(N ) gauge theories, higher dimensional representations and the size of the unparticle world, Phys. Rev. D 76 (2007) 105004 [arXiv:0707.3166] [INSPIRE].ADSGoogle Scholar
  9. [9]
    T. Appelquist et al., Approaching conformality with ten flavors, arXiv:1204.6000 [INSPIRE].
  10. [10]
    A. Deuzeman, M.P. Lombardo, K. Miura, T. Nunes da Silva and E. Pallante, Phases of many flavors QCD: lattice results, PoS(ConfinementX 2012)274 [arXiv:1304.3245] [INSPIRE].
  11. [11]
    M.P. Lombardo, K. Miura, T.J. Nunes da Silva and E. Pallante, On the particle spectrum and the conformal window, JHEP 12 (2014) 183 [arXiv:1410.0298] [INSPIRE].ADSCrossRefGoogle Scholar
  12. [12]
    Z. Fodor, K. Holland, J. Kuti, S. Mondal, D. Nogradi and C.H. Wong, Fate of the conformal fixed point with twelve massless fermions and SU(3) gauge group, Phys. Rev. D 94 (2016) 091501 [arXiv:1607.06121] [INSPIRE].Google Scholar
  13. [13]
    M.E. Peskin, The alignment of the vacuum in theories of technicolor, Nucl. Phys. B 175 (1980) 197 [INSPIRE].ADSCrossRefGoogle Scholar
  14. [14]
    Y. Bai and R.J. Hill, Weakly interacting stable pions, Phys. Rev. D 82 (2010) 111701 [arXiv:1005.0008] [INSPIRE].ADSGoogle Scholar
  15. [15]
    O. Antipin, M. Redi, A. Strumia and E. Vigiani, Accidental composite dark matter, JHEP 07 (2015) 039 [arXiv:1503.08749] [INSPIRE].ADSCrossRefGoogle Scholar
  16. [16]
    Y. Bai, J. Berger and R. Lu, 750 GeV dark pion: cousin of a dark G-parity odd WIMP, Phys. Rev. D 93 (2016) 076009 [arXiv:1512.05779] [INSPIRE].ADSGoogle Scholar
  17. [17]
    M. Redi, A. Strumia, A. Tesi and E. Vigiani, Di-photon resonance and dark matter as heavy pions, JHEP 05 (2016) 078 [arXiv:1602.07297] [INSPIRE].ADSCrossRefGoogle Scholar
  18. [18]
    CMS collaboration, Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search, arXiv:1609.02507 [INSPIRE].
  19. [19]
    ATLAS collaboration, Search for scalar diphoton resonances with 15.4 fb −1 of data collected at \( \sqrt{s}=13 \) TeV in 2015 and 2016 with the ATLAS detector, ATLAS-CONF-2016-059 (2016).
  20. [20]
    B. Holdom, Two U(1)’s and ϵ charge shifts, Phys. Lett. B 166 (1986) 196 [INSPIRE].ADSCrossRefGoogle Scholar
  21. [21]
    A. Hook, E. Izaguirre and J.G. Wacker, Model independent bounds on kinetic mixing, Adv. High Energy Phys. 2011 (2011) 859762 [arXiv:1006.0973] [INSPIRE].MathSciNetCrossRefMATHGoogle Scholar
  22. [22]
    M. Pospelov, Secluded U(1) below the weak scale, Phys. Rev. D 80 (2009) 095002 [arXiv:0811.1030] [INSPIRE].ADSGoogle Scholar
  23. [23]
    BaBar collaboration, B. Aubert et al., Search for a narrow resonance in e + e to four lepton final states, arXiv:0908.2821 [INSPIRE].
  24. [24]
    SLD Electroweak Group, SLD Heavy Flavor Group, DELPHI, LEP, ALEPH, OPAL, LEP Electroweak Working Group, L3 collaboration, A combination of preliminary electroweak measurements and constraints on the standard model, hep-ex/0312023 [INSPIRE].
  25. [25]
    A.D. Martin, W.J. Stirling, R.S. Thorne and G. Watt, Parton distributions for the LHC, Eur. Phys. J. C 63 (2009) 189 [arXiv:0901.0002] [INSPIRE].ADSCrossRefGoogle Scholar
  26. [26]
    S. Catani, D. de Florian, M. Grazzini and P. Nason, Soft gluon resummation for Higgs boson production at hadron colliders, JHEP 07 (2003) 028 [hep-ph/0306211] [INSPIRE].
  27. [27]
    A. Idilbi, C. Kim and T. Mehen, Factorization and resummation for single color-octet scalar production at the LHC, Phys. Rev. D 79 (2009) 114016 [arXiv:0903.3668] [INSPIRE].ADSGoogle Scholar
  28. [28]
    Y. Bai, V. Barger and J. Berger, Constraints on color-octet companions of a 750 GeV heavy pion from dijet and photon plus jet resonance searches, Phys. Rev. D 94 (2016) 011701 [arXiv:1604.07835] [INSPIRE].ADSGoogle Scholar
  29. [29]
    Y. Bai and B.A. Dobrescu, Heavy octets and Tevatron signals with three or four b jets, JHEP 07 (2011) 100 [arXiv:1012.5814] [INSPIRE].ADSCrossRefGoogle Scholar
  30. [30]
    R.S. Chivukula, A. Farzinnia, K. Mohan and E.H. Simmons, Diphoton resonances in the renormalizable coloron model, Phys. Rev. D 94 (2016) 035018 [arXiv:1604.02157] [INSPIRE].ADSGoogle Scholar
  31. [31]
    R.S. Chivukula, A. Farzinnia, J. Ren and E.H. Simmons, Constraints on the scalar sector of the renormalizable coloron model, Phys. Rev. D 88 (2013) 075020 [arXiv:1307.1064] [INSPIRE].ADSGoogle Scholar
  32. [32]
    D. Buttazzo, A. Greljo, G. Isidori and D. Marzocca, Toward a coherent solution of diphoton and flavor anomalies, JHEP 08 (2016) 035 [arXiv:1604.03940] [INSPIRE].ADSCrossRefGoogle Scholar
  33. [33]
    K. Harigaya and Y. Nomura, A composite model for the 750 GeV diphoton excess, JHEP 03 (2016) 091 [arXiv:1602.01092] [INSPIRE].ADSCrossRefGoogle Scholar
  34. [34]
    CMS collaboration, Search for decays of stopped long-lived particles produced in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Eur. Phys. J. C 75 (2015) 151 [arXiv:1501.05603] [INSPIRE].
  35. [35]
    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].
  36. [36]
    CMS collaboration, Search for pair-produced vectorlike B quarks in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Phys. Rev. D 93 (2016) 112009 [arXiv:1507.07129] [INSPIRE].
  37. [37]
    K.S. Babu, C.F. Kolda and J. March-Russell, Implications of generalized Z-Z mixing, Phys. Rev. D 57 (1998) 6788 [hep-ph/9710441] [INSPIRE].
  38. [38]
    V.D. Barger and K. Whisnant, Heavy Z boson decays to two bosons in E 6 superstring models, Phys. Rev. D 36 (1987) 3429 [INSPIRE].ADSGoogle Scholar
  39. [39]
    A. Leike, The phenomenology of extra neutral gauge bosons, Phys. Rept. 317 (1999) 143 [hep-ph/9805494] [INSPIRE].

Copyright information

© The Author(s) 2016

Authors and Affiliations

  • Yang Bai
    • 1
  • Joshua Berger
    • 1
  • James Osborne
    • 1
  • Ben A. Stefanek
    • 1
  1. 1.Department of PhysicsUniversity of Wisconsin-MadisonMadisonU.S.A.

Personalised recommendations