Journal of High Energy Physics

, 2010:159

Bounds and decays of new heavy vector-like top partners

  • Giacomo Cacciapaglia
  • Aldo Deandrea
  • Daisuke Harada
  • Yasuhiro Okada
Open Access
Article

DOI: 10.1007/JHEP11(2010)159

Cite this article as:
Cacciapaglia, G., Deandrea, A., Harada, D. et al. J. High Energ. Phys. (2010) 2010: 159. doi:10.1007/JHEP11(2010)159

Abstract

We study the phenomenology of new heavy vector-like fermions that couple to the third generation quarks via Yukawa interactions, covering all the allowed representations under the standard model gauge groups. We first review tree and loop level bounds on these states. We then discuss tree level decays and loop-induced decays to photon or gluon plus top. The main decays at tree level are to Wb and/ or Z and Higgs plus top via the new Yukawa couplings. The radiative loop decays turn out to be quite close to the naive estimate: in all cases, in the allowed perturbative parameter space, the branching ratios are mildly sensitive on the new Yukawa couplings and small. We therefore conclude that the new states can be observed at the LHC and that the tree level decays can allow to distinguish the different representations. Moreover, the observation of the radiative decays at the LHC would suggest a large Yukawa coupling in the non-perturbative regime.

Keywords

Beyond Standard Model Heavy Quark Physics 
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© The Author(s) 2010

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Giacomo Cacciapaglia
    • 1
    • 2
  • Aldo Deandrea
    • 1
    • 2
  • Daisuke Harada
    • 3
    • 4
  • Yasuhiro Okada
    • 3
    • 3
  1. 1.Université de LyonLyonFrance
  2. 2.Université Lyon 1CNRS/IN2P3, UMR5822 IPNLVilleurbanne CedexFrance
  3. 3.KEK Theory CenterInstitute of Particle and Nuclear Studies, KEKTsukubaJapan
  4. 4.Department of Particle and Nuclear PhysicsGraduate University for Advanced Studies (Sokendai)TsukubaJapan

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