Constraining models with vector-like fermions from FCNC in K and B physics
High Energy Physics - Phenomenology
2014-11-17 v2
Abstract
In this work, we update the constraints on tree level FCNC couplings in the framework of a theory with n isosinglet vector-like down quarks. In this context, we emphasize the sensitivity of the B -> J/psi K_S CP asymmetry to the presence of new vector-like down quarks. This CP asymmetry, together with the rare decays B -> X_{s,d} l bar{l} and K -> pi nu bar{nu} are the best options to further constrain the FCNC tree level couplings or even to point out, in the near future, the possible presence of vector-like quarks in the low energy spectrum, as suggested by GUT theories or models of large extra dimensions at the TeV scale.
Cite
@article{arxiv.hep-ph/0105306,
title = {Constraining models with vector-like fermions from FCNC in K and B physics},
author = {G. Barenboim and F. J. Botella and O. Vives},
journal= {arXiv preprint arXiv:hep-ph/0105306},
year = {2014}
}
Comments
29 pages 11 figures. Comments on the calculation of epsilon' added, references included, conclusions unchanged