Observation of the decay Ξ0→Σ+e-(ν)over-bar-e

被引：24

作者：

Affolder, A

Alavi-Harati, A

Albuquerque, IF

Alexopoulos, T

Arenton, M

Arisaka, K

Averitte, S

Barker, AR

Bellantoni, L

Bellavance, A

Belz, J

Ben-David, R

Bergman, DR

Blucher, E

Bock, GJ

Bown, C

Bright, S

Cheu, E

Childress, S

Coleman, R

Corcoran, MD

Corti, G

Cox, B

Crisler, MB

Erwin, AR

Ford, R

Golossanov, A

Graham, G

Graham, J

Hagan, K

Halkiadakis, E

Hanagaki, K

Hidaka, S

Hsiung, YB

Jejer, V

Jennings, J

Jensen, DA

Kessler, R

Kobrak, HGE

LaDue, J

Lath, A

Ledovskoy, A

McBride, PL

McManus, AP

Mikelsons, P

Monnier, E

Nakaya, T

Nauenberg, U

Nelson, KS

Nguyen, H

机构：

[1] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[2] Univ Arizona, Tucson, AZ 85721 USA

[3] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[4] Univ Calif San Diego, La Jolla, CA 92093 USA

[5] Univ Colorado, Boulder, CO 80309 USA

[6] Elmhurst Coll, Elmhurst, IL 60126 USA

[7] Fermi Natl Accelerator Lab, Batavia, IL 60510 USA

[8] Osaka Univ, Toyonaka, Osaka 560, Japan

[9] Rice Univ, Houston, TX 77005 USA

[10] Rutgers State Univ, Piscataway, NJ 08855 USA

[11] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

[12] Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA

[13] Univ Wisconsin, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.82.3751

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first observation of Xi(0) beta decay, using the KTeV beam line and detector at Fermilab. We have identified 176 beta decay events after subtracting a 7 event background. Normalization to 41024 simultaneously collected Xi(0) --> Lambda(0)pi(0) decays yields a branching ratio of Gamma(Xi(0) --> Sigma(+) e(-)<(nu)over bar>(e))/Gamma(total) = (2.71 +/- 0.22(statistical) +/- 0.31(systematic)) X 10(-4). The flavor symmetric quark model calculation agrees with this result.

引用

页码：3751 / 3754

页数：4

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