Measurement of the branching ratio and asymmetry of the decay Ξ° → Σ°γ

被引：17

作者：

Alavi-Harati, A

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

Glazov, A

Golossanov, A

Graham, G

Graham, J

Hagan, K

Halkiadakis, E

Hamm, J

Hanagaki, K

Hidaka, S

Hsiung, YB

Jejer, V

Jensen, DA

Kessler, R

Kobrak, HGE

LaDue, J

Lath, A

Ledovskoy, A

McBride, PL

Mikelsons, P

Monnier, E

Nakaya, T

Nelson, KS

Nguyen, H

O'Dell, V

Pang, M

Pordes, R

机构：

[1] Fermilab Natl Accelerator Lab, Batavia, IL 60510 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 Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[6] Univ Colorado, Boulder, CO 80309 USA

[7] Elmhurst Coll, Elmhurst, IL 60126 USA

[8] Osaka Univ, Toyonaka, Osaka 5600043, Japan

[9] Rice Univ, Houston, TX 77005 USA

[10] Rutgers State Univ, Piscataway, NJ 08854 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 | 2001年 / 86卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.86.3239

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the rare weak radiative hyperon decay Xi degrees --> Sigma degrees gamma in the KTeV experiment at Fermilab. We have identified 4045 signal events over a background of 804 events. The dominant Xi degrees --> Lambda pi degrees decay, which was used for normalization, is the only important background source. An analysis of the acceptance of both modes yields a branching ratio of B(Xi degrees --> Sigma degrees gamma) / B(Xi degrees --> Lambda pi degrees) = (3.34 +/- 0.05 +/- 0.09) X 10(-3). By analyzing the final state decay distributions, we have also determined that the Sigma degrees emission asymmetry parameter for this decay is alpha (Xi Sigma) = -0.63 +/- 0.09.

引用

页码：3239 / 3243

页数：5

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