Measurement of the tau neutrino helicity and Michel parameters in polarized e(+)e(-) collisions

被引：20

作者：

Abe, K ^{[20
]}

Akagi, T

Allen, NJ

Ash, WW

Aston, D

Baird, KG

Baltay, C

Band, HR

Barakat, MB

Baranko, G

Bardon, O

Barklow, TL

Bashindzhagyan, GL

Bazarko, AO

BenDavid, R

Benvenuti, AC

Bilei, GM

Bisello, D

Blaylock, G

Bogart, JR

Bolen, B

Bolton, T

Bower, GR

Brau, JE

Breidenbach, M

Bugg, WM

Burke, D

Burnett, TH

Burrows, PN

Busza, W

Calcaterra, A

Caldwell, DO

Calloway, D

Camanzi, B

Carpinelli, M

Cassell, R

Castaldi, R

Castro, A

CavalliSforza, M

Chou, A

Church, E

Cohn, HO

Coller, JA

Cook, V

Cotton, R

Cowan, RF

Coyne, DG

Crawford, G

DOliveira, A

机构：

[1] ADELPHI UNIV, GARDEN CITY, NY 11530 USA

[2] IST NAZL FIS NUCL, SEZIONE BOLOGNA, I-40126 BOLOGNA, ITALY

[3] BOSTON UNIV, BOSTON, MA 02215 USA

[4] BRUNEL UNIV, UXBRIDGE UB8 3PH, MIDDX, ENGLAND

[5] UNIV CALIF SANTA BARBARA, SANTA BARBARA, CA 93106 USA

[6] UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA

[7] UNIV CINCINNATI, CINCINNATI, OH 45221 USA

[8] COLORADO STATE UNIV, FT COLLINS, CO 80523 USA

[9] UNIV COLORADO, BOULDER, CO 80309 USA

[10] COLUMBIA UNIV, NEW YORK, NY 10027 USA

[11] IST NAZL FIS NUCL, SEZIONE FERRARA, I-44100 FERRARA, ITALY

[12] UNIV FERRARA, I-44100 FERRARA, ITALY

[13] IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY

[14] UNIV ILLINOIS, URBANA, IL 61801 USA

[15] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA

[16] MIT, CAMBRIDGE, MA 02139 USA

[17] UNIV MASSACHUSETTS, AMHERST, MA 01003 USA

[18] UNIV MISSISSIPPI, UNIVERSITY, MS 38677 USA

[19] MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW 119899, RUSSIA

[20] NAGOYA UNIV, CHIKUSA KU, NAGOYA, AICHI 464, JAPAN

[21] UNIV OREGON, EUGENE, OR 97403 USA

[22] IST NAZL FIS NUCL, SEZIONE PADOVA, I-35100 PADUA, ITALY

[23] UNIV PADUA, I-35100 PADUA, ITALY

[24] IST NAZL FIS NUCL, SEZIONE PERUGIA, I-06100 PERUGIA, ITALY

[25] UNIV PERUGIA, I-06100 PERUGIA, ITALY

[26] IST NAZL FIS NUCL, SEZIONE PISA, I-56100 PISA, ITALY

[27] UNIV PISA, I-56100 PISA, ITALY

[28] RUTGERS STATE UNIV, PISCATAWAY, NJ 08855 USA

[29] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[30] SOGANG UNIV, SEOUL, SOUTH KOREA

[31] SOONGSIL UNIV, SEOUL 156743, SOUTH KOREA

[32] STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA

[33] UNIV TENNESSEE, KNOXVILLE, TN 37996 USA

[34] TOHOKU UNIV, SENDAI, MIYAGI 980, JAPAN

[35] VANDERBILT UNIV, NASHVILLE, TN 37235 USA

[36] UNIV WASHINGTON, SEATTLE, WA 98195 USA

[37] UNIV WISCONSIN, MADISON, WI 53706 USA

[38] YALE UNIV, NEW HAVEN, CT 06511 USA

[39] UNIV GENOA, I-16146 GENOA, ITALY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.78.4691

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a new measurement of the tau neutrino helicity h(nu tau) and the tau Michel parameters rho, eta, xi, and the product delta xi. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the tau decay spectra, using the 1993-1995 SLD data sample of 4328 e(+)e(-) --> Z(0) --> tau(+)tau(-) events. From the decays tau --> pi nu(tau) and tau --> rho nu(tau) we obtain a combined value h(nu tau) = -0.93 +/- 0.10 +/- 0.04. The leptonic decay channels yield combined values of rho = 0.72 +/- 0.09 +/- 0.03, xi = 1.05 +/- 0.35 +/- 0.04, and delta xi = 0.88 +/- 0.27 +/- 0.04.

引用

页码：4691 / 4696

页数：6

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