Effect of longitudinal electron polarization in the measurement of the [tau] weak dipole moment in [ital e][sup +][ital e][sup [minus]] collisions

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.4447· OSTI ID:7204099

Ananthanarayan, B ^[1]; Rindani, S D ^[2]

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1. Institut de Physique Theorique, Batiment des Sciences Physiques, Universite de Lausanne, CH 1015, Lausanne (Switzerland)
2. Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad 380009 (India)

We show that certain [ital CP]-odd momentum correlations in the production and subsequent decay of [tau] pairs in [ital e][sup +][ital e][sup [minus]] collisions get enhanced when the electron beam is longitudinally polarized. Analytic expressions for these correlations are obtained when [tau][sup +][tau][sup [minus]] have a weak'' dipole form factor (WDFF) coupling to [ital Z] in the case of two-body decay modes of the [tau]. Expressions of the variance of these correlations due to the standard model interactions are also presented. For [ital e][sup +][ital e][sup [minus]] collisions at the [ital Z] peak, a sensitivity of about 10[sup [minus]17][ital e] cm for the real part of the [tau] WDFF and 3[times]10[sup [minus]17][ital e] cm for the imaginary part of the [tau] WDFF can be reached using [pi] and [rho] channels (which are the most sensitive channels) in [tau] decay, with 10[sup 6] [ital Z]'s likely to be available at the SLC at Stanford with [ital e][sup [minus]] polarization of 62%--75%.

• OSTI ID: 7204099
• 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-)
662310 -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662430 -- Properties of Leptons-- (1992-)
663300* -- Nuclear Reactions & Scattering
General-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DIPOLE MOMENTS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FORM FACTORS
HEAVY LEPTONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
POLARIZATION
POSTULATED PARTICLES
TAU PARTICLES