Nonuniversal correction to {ital Z}{r_arrow}{ital b{bar b}} and flavor-changing neutral current couplings

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.51.6584· OSTI ID:45715

Zhang, X; Young, B ^[1]

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1. Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

A nonuniversal interaction, which involves only the heavy quarks ({ital t}{sub {ital L}},{ital b}{sub {ital L}}) and {ital t}{sub {ital R}}, modifies the neutral current couplings and induces flavor-changing neutral currents (FCNC`s). The size of the FCNC effect depends crucially on the dynamics of the fermion mass generation. In this paper, we study the effect of the nonuniversal interaction on {ital Zb{bar b}}, {ital Zb{bar s}}, {ital Zd{bar s}}, and {ital Zd{bar b}}, by using an effective Lagrangian technique and assuming the quark mass matrices in the form of a generalized Fritzsch {ital Ansatz}. We point out that, if fitting {ital R}{sub {ital b}}={Gamma}({ital Z}{r_arrow}{ital b{bar b}})/{Gamma}({ital Z}{r_arrow}hadrons) to the CERN LEP data within 1{sigma}, the induced FCNC couplings are very close to the allowed bounds of several rare decays.

• DOE Contract Number: FG02-94ER40817
• OSTI ID: 45715
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 51; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BEAUTY PARTICLES
CORRECTIONS
COUPLING
FERMILAB COLLIDER DETECTOR
FERMIONS
FLAVOR
LAGRANGIAN FUNCTION
MASS
NEUTRAL-CURRENT INTERACTIONS
QUARKS
VERTEX FUNCTIONS
Z NEUTRAL BOSONS