1971/11/01 by Yung-Su Tsai · 10 citations
Engineering · Physics and Astronomy · #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.1103/physrevd.4.2821
openalex publication_date 1971/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Assuming that leptons heavier than muons exist in nature, we consider their decay modes and the correlations between the decay products of l+ and l^\ensuremath- in the colliding-beam experiment: e++e^\ensuremath-\ensuremath→l++l^\ensuremath-. Far above the threshold, the helicities of l+ and l^\ensuremath- tend to be opposite to each other. Near the threshold the directions of spins of l+ and l^\ensuremath- prefer to be parallel to each other, and the sum of the two spins prefers to be either parallel or anti-parallel to the direction of the incident electron. Because the parity conservation is violated maximally in the decays of l+ and l^\ensuremath-, the angular distributions of decay products depend strongly on the spin orientation of the heavy leptons. Since the spins of l+ and l^\ensuremath- are strongly correlated in the production, we found a strong correlation between the energy-angle distributions of the decay products of l+ and l^\ensuremath-. The decay widths of l^\ensuremath- into channels \ensuremathνl\ensuremathνee^\ensuremath-, \ensuremathνl\ensuremathν_\ensuremathμ\ensuremathμ^\ensuremath-, \ensuremathνl\ensuremathπ^\ensuremath-, \ensuremathνlK^\ensuremath-, \ensuremathνl\ensuremathρ^\ensuremath-, \ensuremathνlK*, \ensuremathνlA1, \ensuremathνlQ, and \ensuremathνl+hadron continuum as functions of the mass of l^\ensuremath- are estimated.