Measurements of the rare decay KL → e+e-e+e-

被引：23

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 ^{[1
]}

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] Rutgers State Univ, Piscataway, NJ 08854 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] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

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

[10] Rice Univ, Houston, TX 77005 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 / 24期

关键词：

D O I：

10.1103/PhysRevLett.86.5425

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We observe 441 K-L --> e(+)e(-)e(+)e(-) candidate events with a background of 4.2 events and measure B(K-L --> e(+)e(-)e(+)e(-)) = [3.72 +/- 0.18(stat) +/- 0.23(syst)] X 10(-8) in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e(+)e(-) pairs, we measure the CP parameters beta (CP) = -0.23 +/- 0.09(stat) +/- 0.02(syst) and gamma (CP) = -0.09 +/- 0.09(stat) +/- 0.02(syst). We also present the first detailed study of the e(+)e(-) invariant mass spectrum in this decay mode.

引用

页码：5425 / 5429

页数：5

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