Determination of the Michel parameters and the tau neutrino helicity in tau decay

被引：26

作者：

Alexander, JP

Bebek, C

Berger, BE

Berkelman, K

Bloom, K

Cassel, DG

Cho, HA

Coffman, DM

Crowcroft, DS

Dickson, M

Drell, PS

Ecklund, KM

Ehrlich, R

Elia, R

Foland, AD

Gaidarev, P

Galik, RS

Gittelman, B

Gray, SW

Hartill, DL

Heltsley, BK

Hopman, PI

Kandaswamy, J

Kim, PC

Kreinick, DL

Lee, T

Liu, Y

Ludwig, GS

Masui, J

Mevissen, J

Mistry, NB

Ng, CR

Nordberg, E

Ogg, M

Patterson, JR

Peterson, D

Riley, D

Soffer, A

ValantSpaight, B

Ward, C

Athanas, M

Avery, P

Jones, CD

Lohner, M

Prescott, C

Yelton, J

Zheng, J

Brandenburg, G

Briere, RA

Gao, YS

机构：

[1] UNIV FLORIDA, GAINESVILLE, FL 32611 USA

[2] HARVARD UNIV, CAMBRIDGE, MA 02138 USA

[3] UNIV HAWAII MANOA, HONOLULU, HI 96822 USA

[4] UNIV ILLINOIS, URBANA, IL 61801 USA

[5] CARLETON UNIV, OTTAWA, ON K1S 5B6, CANADA

[6] ITHACA COLL, ITHACA, NY 14850 USA

[7] UNIV KANSAS, LAWRENCE, KS 66045 USA

[8] UNIV MINNESOTA, MINNEAPOLIS, MN 55455 USA

[9] SUNY ALBANY, ALBANY, NY 12222 USA

[10] OHIO STATE UNIV, COLUMBUS, OH 43210 USA

[11] UNIV OKLAHOMA, NORMAN, OK 73019 USA

[12] PURDUE UNIV, W LAFAYETTE, IN 47907 USA

[13] UNIV ROCHESTER, ROCHESTER, NY 14627 USA

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

[15] SO METHODIST UNIV, DALLAS, TX 75275 USA

[16] SYRACUSE UNIV, SYRACUSE, NY 13244 USA

[17] VANDERBILT UNIV, NASHVILLE, TN 37235 USA

[18] VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA

[19] WAYNE STATE UNIV, DETROIT, MI 48202 USA

[20] CALTECH, PASADENA, CA 91125 USA

[21] UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA

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

[23] UNIV COLORADO, BOULDER, CO 80309 USA

[24] UNIV TEXAS, AUSTIN, TX 78712 USA

[25] BINP, RU-630090 NOVOSIBIRSK, RUSSIA

[26] LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA

来源：

PHYSICAL REVIEW D | 1997年 / 56卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.56.5320

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the CLEO II detector at the Cornell Electron Storage Ring operated at root s=10.6 GeV, we have determined the Michel parameters rho, xi and delta in tau(-/+)-->l(-/+) nu<(nu)over bar> decay as well as the tau neutrino helicity parameter h(nu tau) in tau(-/+)-->pi(-/+)pi(0) nu decay. From a data sample of 3.02x10(6) produced tau pairs we analyzed events of the topologies e(+)e(-)-->tau(+)tau(-)-->(l(+/-)nu<(nu)over bar>)(pi(-/+)pi(0) nu) and e(+)e(-)-->tau(+)tau(-)-->(pi(+/-)pi(0)<(nu)over bar>)pi(-/+)pi(0) nu). We obtain rho=0.747 rho =0.747+/-0.010+/-0.006, xi=1.007+/-0.040+/-0.015, xi delta=0.745+/-0.026+/-0.009, and h(nu tau)=-0.995+/-0.010 +/-0.003, when we have used the previously determined sign of h(nu tau) [ARGUS Collaboration, H. Albrecht et al., Z. Phys. C 58, 61 (1993); Phys. Lett. B 349, 576 (1995)]. We also present the Michel parameters as determined from the electron and muon samples separately. All results are in agreement with the standard model V-A interaction.

引用

页码：5320 / 5329

页数：10

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