Measurement of the decay rate and form factor parameter αK* in the decay KL → e+e-γ

被引：23

作者：

Fanti, V

Lai, A

Musa, L

Marras, D

Nappi, A

Hay, B

Moore, RW

Moore, KN

Munday, DJ

Needham, MD

Parker, MA

White, TO

Wotton, SA

Barr, G

Bocquet, G

Bremer, J

Ceccucci, A

Cundy, D

Doble, N

Funk, W

Gatignon, L

Gianoli, A

Gonidec, A

Govi, G

Grafström, P

Kubischta, W

Lacourt, A

Luitz, S

Kesseler, G

Matheys, JP

Norton, A

Palestini, S

Panzer-Steindel, B

Schinzel, D

Taureg, H

Velasco, M

Vossnack, O

Wahl, H

Wirrer, G

Kekelidze, V

Mestvirishvili, A

Tatishvili, G

Potrebenikov, I

Tkatchev, A

Zinchenko, A

Boyle, O

Martin, VJ

Knowles, IG

Parsons, HLC

Dalpaiz, P

机构：

[1] Univ Cagliari, Dipartimento Fis, I-09100 Cagliari, Italy

[2] Ist Nazl Fis Nucl, Sez Cagliari, I-09100 Cagliari, Italy

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[4] CERN, CH-1211 Geneva 23, Switzerland

[5] Joint Inst Nucl Res, Dubna, Russia

[6] Univ Edinburgh, Dept Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[7] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[8] Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy

[9] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy

[10] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[11] Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[12] Univ Paris Sud, Lab Accelerateur Lineaire, CNRS, IN2P3, F-91406 Orsay, France

[13] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy

[14] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[15] Univ Pisa, Dipartimento Fis, Scuola Normale Super Pisa, I-56100 Pisa, Italy

[16] Ist Nazl Fis Nucl, Sez Pisa, I-56100 Pisa, Italy

[17] CEA Saclay, DSM, DAPNIA, F-91191 Gif Sur Yvette, France

[18] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[19] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

[20] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[21] Soltan Inst Nucl Studies, High Energy Phys Lab, PL-00681 Warsaw, Poland

[22] Osterreich Akad Wissensch, Inst Hochenergiephys, A-1050 Vienna, Austria

[23] Univ Modena, Dipartimento Fis, I-41100 Modena, Italy

[24] Univ Los Andes, Dept Fis, Merida 5101A, Venezuela

来源：

PHYSICS LETTERS B | 1999年 / 458卷 / 04期

关键词：

D O I：

10.1016/S0370-2693(99)00561-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decay rate of the neutral K meson K-L --> e(+)e(-)gamma has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Gamma(K-L --> e(+)e(-)gamma)/Gamma(K-L --> all) = (1.06 +/- 0.02(stat) +/- 0.02(sys) +/- 0.04(calc)) X 10(-5). The parameter alpha(K*) describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be alpha(K*) = -0.36 +/- 0.06(stat) +/- 0.02(sys). (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：553 / 563

页数：11

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