Stage-two spin-correlation functions: Tests for non-CKM-type leptonic [ital CP] violation in [tau][r arrow][rho][nu] decay

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.4544· OSTI ID:7224407

Nelson, C A; Friedman, H S; Goozovat, S; Klein, J A; Kneller, L R; Perry, W J; Ustin, S A ^[1]

---

1. Department of Physics, State University of New York at Binghamton, Binghamton, New York 13902-6000 (United States)

There are two tests for leptonic [ital CP] violation in [tau][r arrow][rho][nu] decay by inclusion of [rho] polarimetry observables in the energy correlation function for [ital Z][sup 0] or [gamma][sup *][r arrow][tau][sup [minus]][tau][sup +][r arrow]([rho][sup [minus]][nu])([rho][sup +][bar [nu]]). By [ital CP] invariance the moduli ratio of, and phase difference between, the two helicity amplitudes for [tau][sup [minus]][r arrow][rho][sup [minus]][nu][sub [tau]] decay should equal those for [tau][sup +][r arrow][rho][sup +][bar [nu]][sub [tau]] decay. The full angular distribution for the above process, including the [pi][sup [minus plus]] momentum direction versus that of the [rho][sup [minus plus]] momentum, can be used to test for such a non-CKM-type leptonic [ital CP] violation in [tau][r arrow][rho][nu] decay. Since this adds on spin-correlation information from the next stage of decays in the decay sequence, we call such an energy-angular distribution a stage-two spin-correlation (S2SC) function. Ideal statistical errors for [tau][r arrow][rho][nu] decay are calculated for possible application at the [ital Z][sup 0], at a [ital B] factory, or at the [tau]-charm threshold. S2SC functions should be useful for testing for possible non-CKM-type [ital CP] violation in top quark and in [ital W] boson decay processes.

• DOE Contract Number: FG02-86ER40291
• OSTI ID: 7224407
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662370* -- Decays of Leptons-- (1992-)
662430 -- Properties of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CORRELATION FUNCTIONS
CP INVARIANCE
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY
FERMIONS
FIELD THEORIES
FUNCTIONS
HEAVY LEPTONS
INVARIANCE PRINCIPLES
KOBAYASHI-MASKAWA MATRIX
LEPTONS
MATRICES
PARTICLE DECAY
PARTICLE PROPERTIES
POSTULATED PARTICLES
SPIN
TAU PARTICLES
UNIFIED-FIELD THEORIES
VIOLATIONS