arXiv:hep-ph/0507017·v1·High Energy Physics — Phenomenology
Puzzle of W Leptonic Decay Branching Fractions and Gauge Model of Generation Nonuniversality
Xiao-Yuan Li (ITP Beijing)🇨🇳 · Ernest Ma (UC Riverside)🇺🇸
Abstract
Lepton generation universality holds very well in Z decays, but appears to be violated in recent LEP data of W leptonic decay branching fractions. If this trend persists, a consistent and natural explanation is a model of generation nonuniversality, based on the gauge group SU(2)_L X U(1)_R X U(1)_{B-L}.
Comments: 16 pages, no figure