Observation of the decay KS → π+π-e+e-

被引：13

作者：

Lai, A

Marras, D

Musa, L

Bevan, A

Dosanjh, RS

Gershon, TJ

Hay, B

Kalmus, GE

Munday, DJ

Needham, MD

Olaiya, E

Parker, MA

White, TO

Wotton, SA

Barr, G

Blümer, H

Bocquet, G

Ceccucci, A

Cundy, D

D'Agostini, G

Doble, N

Falaleev, V

Gatignon, L

Gonidec, A

Govi, G

Grafström, P

Kubischta, W

Lacourt, A

Norton, A

Palestini, S

Panzer-Steindel, B

Peyaud, B

Taureg, H

Velasco, M

Wahl, H

Cheshkov, C

Hristov, P

Kekelidze, V

Madigojine, D

Mestvirishvili, A

Molokanova, N

Potrebenikov, Y

Tatishvili, G

Tkatchev, A

Zinchenko, A

Knowles, I

Martin, V

Parsons, H

Sacco, R

Lazzeroni, C

机构：

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

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

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

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

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

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

[7] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy

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

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

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

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

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

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

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

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

[16] Joint Nucl Res Inst, Dubna, Russia

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

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

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

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

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

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

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

来源：

PHYSICS LETTERS B | 2000年 / 496卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(00)01300-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first observation of the decay K-S -> pi (+)pi (-)e(+)e(-) based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using K-L -> pi (+)pi (-)pi (0)(D) decays as normalization sample, the branching ratio is measured to be BR(K-S -> pi (+)pi (-)e(+)e(-)) = [4.5 +/- 0.7(stat) +/- 0.4(syst)] x 10(-5). This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：137 / 144

页数：8

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