Decay-lepton angular distribution in polarized {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{ital t{bar t}} and {ital CP}-violating dipole couplings of the top quark

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.54.4326· OSTI ID:383910

Poulose, P; Rindani, S D ^[1]

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1. Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad 380009 (India)

In the presence of an electric dipole coupling of {ital t{bar t}} to a photon, and an analogous {open_quote}{open_quote}weak{close_quote}{close_quote} dipole coupling to the {ital Z}, {ital CP} violation in the process {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{ital t{bar t}} leads to the polarization of the top quark and top antiquark. This polarization can be analyzed by studying the energy and angular distributions of a decay charged lepton (antilepton) when the top quark (top antiquark) decays leptonically. We have obtained analytic expressions for these distributions when either {ital t} or {ital {bar t}} decays leptonically. We study two types of simple {ital CP}-violating angular asymmetries which do not need the full reconstruction of {ital t} or {ital {bar t}}. These together can help to determine the electric and weak dipole form factors independently. We have also shown how the use of longitudinal beam polarization can help to do this with only one asymmetry measurement, and to improve the sensitivity. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383910
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 54; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
CHARGED PARTICLES
COUPLING
CP INVARIANCE
DIPOLES
DISTRIBUTION FUNCTIONS
ELECTRIC DIPOLES
ELECTRON-POSITRON INTERACTIONS
ENERGY
FORM FACTORS
PARTICLE DECAY
PARTICLE PRODUCTION
POLARIZATION
POLARIZED BEAMS
T QUARKS
TOPONIUM
VIOLATIONS