Tau Lorentz Structure with Polarization at SLD

Technical Report · Thu Jan 29 04:00:00 EST 2004

DOI:https://doi.org/10.2172/826624· OSTI ID:826624

Abe, K ^[1]

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1. SLAC

We present a measurement of the tau neutrino helicity (h{sub {nu}{sub {tau}}}) and the Michel parameters ({rho}, {zeta} and {delta}) by analyzing the {tau} decays {tau} {yields} {pi}(K){nu}{sub {tau}}, {tau} {yields} e{bar {nu}}{sub e}{nu}{sub {tau}} and {tau} {yields} {mu}{bar {nu}}{sub {mu}} in e{sup +}e{sup -} {yields} Z{sup 0} {yields} {tau}{sup +}{tau}{sup -}. The analysis uses the 1993-1995 SLD data sample of 4316 {tau}-pair events produced with highly polarized electrons. We obtain preliminary results of h{sub {nu}{sub {tau}}} = -0.81 {+-} 0.18 {+-} 0.03, {rho} = 0.71 {+-} 0.09 {+-} 0.04, {zeta} = 1.03 {+-} 0.36 {+-} 0.05 and {zeta}{delta} = 0.84 {+-} 0.27 {+-} 0.05.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 826624
• Report Number(s): SLAC-PUB-7216
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRONS
HELICITY
POLARIZATION
TAU NEUTRINOS