Possible deviations in. tau. polarization in e sup minus e sup + r arrow. tau. sup minus. tau. sup + due to exotic-lepton mixing

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.3881· OSTI ID:5910955

Singh, S; Parashari, R K; Sharma, N K ^[1]

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1. Department of Physics, University of Rajasthan, Jaipur 302004 (India)

The {tau} polarization {ital P}{sub {tau}}({ital s},cos{theta}) as a function of the production polar angle {theta}, the mean {tau} polarization in the forward hemisphere {l angle}{ital P}{sub {tau}}({ital s}){r angle}{sub {ital F}}, and the total mean {tau} polarization {l angle}{ital P}{sub {tau}}({ital s}){r angle}{sub {ital T}} in the process {ital e}{sup {minus}}{ital e}{sup +}{r arrow}{tau}{sup {minus}}{tau}{sup +} are reexamined with the inclusion of mixing between ordinary ({ital l}={ital e},{tau}) and exotic ({ital E}{sub {ital l}}) leptons of type (i) vector singlet (VS), (ii) vector doublet (VD), and (iii) mirror (M) for c.m. energies around the {ital Z} peak. For {radical}{ital s} {similar to}{ital M}{sub {ital Z}}, the deviations from standard-model expectations are much less for the M lepton mixing in comparison to those due to the VS or VD lepton mixing. Around the {ital Z} peak, the VS (VD) mixing induces negative (positive) deviations. At {radical}{ital s} ={ital M}{sub {ital Z}}, for the presently allowed mixing element square, {vert bar}{ital U}{sub {tau}{ital E}{tau}}{vert bar}{sup 2}=0.02, the expected relative deviations are (i) {minus}11.4% (+13.0%) in {ital P}{sub {tau}}(cos{theta}=0.75), (ii) {minus}11.8% (+13.5%) in {l angle}{ital P}{sub {tau}}({ital s}){r angle}{sub {ital F}}, and (iii) {minus}23.2% (+27.0%) in {l angle}{ital P}{sub {tau}}({ital s}){r angle}{sub {ital T}}, for VS (VD) types of mixed exotic leptons.

• OSTI ID: 5910955
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANGULAR DISTRIBUTION
ANNIHILATION
BASIC INTERACTIONS
BREMSSTRAHLUNG
COUPLING CONSTANTS
CURRENTS
DISTRIBUTION
EIGENSTATES
ELECTRODYNAMICS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HEAVY LEPTONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIE GROUPS
MATHEMATICAL MODELS
MATRIX ELEMENTS
NEUTRAL CURRENTS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE MODELS
POLARIZED PRODUCTS
POSTULATED PARTICLES
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
QUANTUM NUMBERS
RADIATIONS
STANDARD MODEL
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
TAU PARTICLES
UNIFIED GAUGE MODELS
WEAK INTERACTIONS
WEAK NEUTRAL CURRENTS