2010/08/31 by Diganta Das, David London, Rahul Sinha +2 · 5 citations
Chemistry · Physics and Astronomy · #Branching fraction #Chemistry #Crystallography #Electroweak interaction #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.82.093019
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 82(9) (American Physical Society) · 14 pages, 6 figures
arxiv created 2010/09/09 · openalex publication_date 2010/11/29 · arxiv updated 2010/12/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the decays of heavy chiral (t^\ensuremath',b^\ensuremath') quarks in a four-generation extension of the standard model. If the difference between the t^\ensuremath' and b^\ensuremath' masses is smaller than the W^\ifmmode±\else\textpm\fi mass, as favored by precision electroweak measurements, then the Cabibbo-Kobayashi-Maskawa favored, on-shell decay t^\ensuremath'\ensuremath→b^\ensuremath'W+ is forbidden. As a result, other t^\ensuremath' decays have substantial branching fractions, which are highly sensitive to the magnitude of the diagonal CKM matrix element V_t^\ensuremath'b^\ensuremath'. We show that |V_t^\ensuremath'b^\ensuremath'| can be determined from the ratio of the two-body and three-body t^\ensuremath'-decay branching fractions and estimate the precision of such a measurement at the LHC. We discuss the hadronization of a t^\ensuremath' for large enough values of |V_t^\ensuremath'b^\ensuremath'|.