Sutapa Sen

Composite model for quarks and leptons

A new composite model in which two types of fundamental fermions exist is proposed. These consist of light quarks q/sub B/(u,d) and new lepton quarks with fractional charges (-(2/3), (1/3)) and a lepton number L = (1/3) such that leptons are composites of three lepton quarks (3q/sub L/) while nonstrange baryons are 3q/sub B/ composites. In addition, heavy quarks are obtained as q/sub B/q/sub L/q-bar/sub L/ composites which throw interesting light on the mechanism of heavy-quark decay modes.