Measurement of the decay KL → π0γγ

被引:44
作者
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 [1 ]
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
O'Dell, V
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
关键词
D O I
10.1103/PhysRevLett.83.917
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on a new measurement of the decay K-L --> pi(0)gamma gamma by the KTeV experiment at Fermilab. We determine the K-L --> pi(0)gamma gamma branching ratio to be (1.68 +/- 0.07 +/- 0.08) x 10(-6). Our data show the first evidence for a low-mass gamma gamma signal as predicted by recent O(p(6)) chiral perturbation calculations which include vector meson exchange contributions. From our data, we extract a value for the effective vector coupling a(V) = -0.72 +/- 0.05 +/- 0.06.
引用
收藏
页码:917 / 921
页数:5
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