Measurement of the KL → e+e-e+e- decay rate

被引：6

作者：

Lai, A ^{[1
]}

Marras, D

Bevan, A

Dosanjh, RS

Gershon, TJ

Hay, B

Kalmus, GE

Lazzeroni, C

Munday, DJ

Needham, MD

Olaiya, E

Parker, MA

White, TO

Wotton, SA

Barr, G

Bocquet, G

Ceccucci, A

Cuhadar, T

Cundy, D

D'Agostini, G

Doble, N

Falaleev, V

Gatignon, L

Gonidec, A

Gorini, B

Govi, G

Grafström, P

Kubischta, W

Lacourt, A

Norton, A

Palestini, S

Panzer-Steindel, B

Tatishvili, G

Taureg, H

Velasco, M

Wahl, H

Cheshkov, C

Hristov, P

Kekelidze, V

Madigojine, D

Molokanova, N

Potrebenikov, Y

Zinchenko, A

Knowles, I

Martin, V

Sacco, R

Walker, A

Contalbrigo, M

Dalpiaz, P

Duclos, J

机构：

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

[2] Ist Nazl Fis Nucl, Sezione Cagliari, I-90100 Cagliari, Italy

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

[4] CERN, CH-1211 Geneva, Switzerland

[5] Joint Nucl Res Inst, 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, Sezione Ferrara, I-44100 Ferrara, Italy

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

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

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

[12] Univ Paris 11, Lab Accelerateur Lineaire, IN2P3, CNRS, F-91406 Orsay, France

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

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

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

[16] Ist Nazl Fis Nucl, Sezione 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 Sperimentale, I-10125 Turin, Italy

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

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

[22] Osterr Akad Wissenschaften, Inst Hochenergiephys, A-1050 Vienna, Austria

来源：

PHYSICS LETTERS B | 2005年 / 615卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2005.03.078

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decay rate of the long-lived neutral K meson into the e(+)e(-)e(+)e(-) final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br(K-L -> e(+)e(-)e(+)e(-)) = (3.30 +/- 0.24(stat)+/- 0.23(syst)+/- 0-10(norm)) x 10(-8). (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：31 / 38

页数：8

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