Measurement of the branching fraction of the decay KL→π+π-e+e-

被引：28

作者：

Adams, J

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

Graham, G

Graham, J

Hagan, KA

Halkiadakis, E

Hanagaki, K

Hazumi, M

Hidaka, S

Hsiung, YB

Jejer, V

Jennings, J

Jensen, DA

Johnson, PT

Kessler, R

Kobrak, HGE

LaDue, J

Lath, A

Ledovskoy, A

McManus, AP

Mikelsons, P

Monnier, E

Nakaya, T

Nauenberg, U

Nelson, KS

Nguyen, H

机构：

[1] Fermi 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 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 | 1998年 / 80卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.80.4123

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first branching fraction measurement of the decay K-L --> pi(+)pi(-) e(+)e(-). With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(K-L --> pi(+)pi(-) e(+)e(-)) = [3.2 +/- 0.6(stat) +/- 0.4(syst)] x 10(-7). This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung.

引用

页码：4123 / 4126

页数：4

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