MEASUREMENT OF THE RATE OF THE DECAY KL-]E+E-GAMMA AND OBSERVATION OF A FORM-FACTOR IN THIS DECAY

被引：157

作者：

BARR, GD

CAROSI, R

COWARD, D

CUNDY, D

DOBLE, N

GATIGNON, L

GIBSON, V

GRAFSTROM, P

HAGELBERG, R

KESSELER, G

VANDERLANS, J

NELSON, HN

WAHL, H

BLACK, R

CANDLIN, DJ

MUIR, J

PEACH, KJ

BLUMER, H

HEINZ, R

KLEINKNECHT, K

MAYER, P

PANZER, B

RENK, B

ROHRER, H

AUGE, E

CHASE, RL

FOURNIER, D

HEUSSE, P

ICONOMIDOUFAYARD, L

HARRUS, I

SCHAFFER, AC

BIGI, A

CALAFIURA, P

CALVETTI, M

CASALI, R

CERRI, C

FANTECHI, R

MANNELLI, I

NAPPI, A

PIERAZZINI, GM

BURKHARDT, H

HOLDER, M

KREUTZ, A

QUAST, G

ROST, M

SANDER, HG

WEIHS, W

WERTHENBACH, R

ZECH, G

机构：

[1] UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND

[2] UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY

[3] UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE

[4] IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-56100 PISA,ITALY

[5] UNIV SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN,GERMANY

来源：

PHYSICS LETTERS B | 1990年 / 240卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(90)90446-D

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A large sample of Dalitz decays, KL→e+e-γ, has been observed. The branching ratio is Γ(KL→e+e-γ) Γ(KL →all)=(9.2±0.5±0.5)×10-6 in good agreement with theoretical predictions. We observe an enhancement at high masses in the distribution of the invariant electron-positron pair mass, compared to the distribution expected from QED. This excess is interpreted as being due to virtual mesons contributing to the photon propagator. © 1990.

引用

页码：283 / 288

页数：6

共 17 条

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