Measuring the Magnitude of the Fourth-Generation CKM4 Matrix Element V_{t'b'}
High Energy Physics - Phenomenology
2010-12-23 v2
Abstract
We study the decays of heavy chiral (t', b') quarks in a four-generation extension of the Standard Model. If the difference between the t' and b' masses is smaller than the W mass, as favored by precision electroweak measurements, then the Cabibbo-Kobayashi-Maskawa favored, on-shell decay t'-->b'W is forbidden. As a result, other t' decays have substantial branching fractions, which are highly sensitive to the magnitude of the diagonal CKM matrix element V_{t'b'}. We show that |V_{t'b'}| can be determined from the ratio of the two-body and three-body t'-decay branching fractions and estimate the precision of such a measurement at the LHC. We discuss the hadronization of a t' for large enough values of |V_{t'b'}|.
Cite
@article{arxiv.1008.4925,
title = {Measuring the Magnitude of the Fourth-Generation CKM4 Matrix Element V_{t'b'}},
author = {Diganta Das and David London and Rahul Sinha and Abner Soffer},
journal= {arXiv preprint arXiv:1008.4925},
year = {2010}
}
Comments
14 pages, 6 figures