Observation of CP violation in KL→π+π-e+e- decays

被引：85

作者：

Alavi-Harati, A

Albuquerque, IF

Alexopouos, 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 ^{[1
]}

Crisler, MB

Erwin, AR

Ford, R

Glazov, A

Golossanov, A

Graham, G

Graham, J

Hagan, K

Halkiadakis, E

Hanagaki, K

Hazumi, M

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

机构：

[1] Univ Arizona, Tucson, AZ 85721 USA

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

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

[4] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 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 | 2000年 / 84卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.84.408

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first observation of a manifestly CP violating effect in the K-L --> pi(+) pi(-) e(+) e(-) decay mode. A large asymmetry was observed in the distribution of these decays in the CP-odd and T-odd angle phi between the decay planes of the e(+) e(-) and pi(+) pi(-) pairs in the K-L center of mass system. After acceptance corrections, the overall asymmetry is found to be [13.6 +/- 2.5(stat) +/- 1.2(syst)]%. This is the largest CP-violating effect yet observed when integrating over the entire phase space of a mode and the first such effect observed in an angular variable.

引用

页码：408 / 411

页数：4

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