Leptonic CP -violating asymmetry in e sup + e minus annihilation due to Z width effects

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.3008· OSTI ID:7261969

Joshipura, A S; Rindani, S D ^[1]

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1. Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009 (India)

{ital C}P-violating rate asymmetry can be generated in a process only if its amplitude possesses an absorptive part. Such an absorptive part can be provided in {ital e}{sup +}{ital e{minus}} annihilation by the presence of a {ital Z} resonance of nonzero width. The lepton-flavor-violating {ital CP} asymmetry in the process {ital e}{sup +}{ital e{minus}}{r arrow}{ital l}{sub {ital i}{bar l}{ital j}}({ital {bar l}}{sub {ital i}l{ital j}}), where {ital l}{sub {ital i}} are charged leptons, is discussed in several models. In a specific two-{ital Z} model, with an extra U(1) gauge group corresponding to {ital L}{sub {ital e}}{minus}{ital L}{sub {tau}} ({ital L}{sub {ital e}},{ital L}{sub {tau}} being the lepton numbers associated with the electron and the {tau} lepton), large and observable {ital CP} asymmetry in {ital e}{sup +}{ital e{minus}}{r arrow}{tau}{sup +}{ital e{minus}}({tau}{sup {minus}}{ital e+}) is shown to be possible at energies reached at the CERN {ital e}{sup +}{ital e{minus}} collider and SLAC Linear Collider. Various constraints coming from present experimental data have been taken into account while making this prediction.

• OSTI ID: 7261969
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:7; ISSN PRVDA; 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-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ASYMMETRY
BASIC INTERACTIONS
BOSONS
CP INVARIANCE
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HEAVY LEPTONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INVARIANCE PRINCIPLES
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIE GROUPS
MATHEMATICAL MODELS
MATTER
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHASE SHIFT
POSITRONS
POSTULATED PARTICLES
PROPAGATOR
QUARKS
STANDARD MODEL
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
TAU PARTICLES
U GROUPS
U-1 GROUPS
UNIFIED GAUGE MODELS
Z NEUTRAL BOSONS