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Anomalous tqZ coupling effects in rare B- and K-meson decays

  • Xin-Qiang Li
  • Ya-Dong Yang
  • Xing-Bo Yuan
Article

Abstract

As a top-factory, the LHC is performing a direct study of top-quark anomalous FCNC couplings, which are, however, correlated closely with the rare B- and K-meson decays. In this paper, we study the effects of anomalous tqZ (with q = u, c) couplings in the rare decays B s,d μ + μ , BX s ν \( \overline \nu \), BK (*) ν \( \overline \nu \), K + → π+ ν \( \overline \nu \), and K L → π0 ν \( \overline \nu \). With the up-to-date experimental bounds on the branching ratios of these channels, constraints on the left-handed anomalous couplings \( X_{{ct}}^L \) and \( X_{{ut}}^L \) are derived, respectively. With these low-energy constraints taken into account, we find that, for real couplings \( X_{{ct}}^L \) and \( X_{{ut}}^L \), the indirect upper bounds on B(tqZ) are much lower than that from the D0 collaboration, but are still compatible with the 5σ discovery potential of ATLAS with an integrated luminosity of 10 fb1. With refined measurements to be available at the LHCb, the future super-B factories, the NA62 at CERN, and the KOTO at J-PARC, closer correlations between the tqZ and the rare B- and K-meson decays are expected in the near future, which will be helpful for the searches of the top-quark FCNC decays at the LHC.

Keywords

Rare Decays Beyond Standard Model B-Physics Kaon Physics 

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Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  1. 1.Department of PhysicsHenan Normal UniversityXinxiangP.R. China
  2. 2.IFIC, Universitat de València-CSICValènciaSpain
  3. 3.Institute of Particle PhysicsHuazhong Normal UniversityWuhanP.R. China
  4. 4.Key Laboratory of Quark & Lepton Physics, Ministry of EducationHuazhong Normal UniversityWuhanP. R. China

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