Observation of the rare decay KS → π0e+e-

被引：57

作者：

Batley, JR ^{[1
]}

Kalmus, GE

Lazzeroni, C

Munday, DJ

Patel, M

Slater, MW

Wotton, SA

Arcidiacono, R

Bocquet, G

Ceccucci, A

Cundy, D

Doble, N

Falaleev, V

Gatignon, L

Gonidec, A

Grafström, P

Kubischta, W

Marchetto, F

Mikulec, I

Norton, A

Panzer-Steindel, B

Rubin, P

Wahl, H

Goudzovski, E

Gurev, D

Hristov, P

Kekelidze, V

Litov, L

Madigozhin, D

Molokanova, N

Potrebenikov, Y

Stoynev, S

Zinchenko, A

Monnier, E

Swallow, E

Winston, R

Sacco, R

Walker, A

Baldini, W

Dalpiaz, P

Frabetti, PL

Gianoli, A

Martini, M

Petrucci, F

Scarpa, M

Savrié, M

Bizzeti, A

Calvetti, M

Collazuol, G

Graziani, G

机构：

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

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

[3] Joint Inst Nucl Res, Dubna, Russia

[4] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60126 USA

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

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

[7] Sezione INFN Ferrara, I-44100 Ferrara, Italy

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

[9] Sezione INFN Firenze, I-50125 Florence, Italy

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

[11] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

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

[13] Sezione INFN Perugia, I-06100 Perugia, Italy

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

[15] Sezione INFN Pisa, I-56100 Pisa, Italy

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

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

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

[19] Sezione INFN Torino, I-10125 Turin, Italy

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

[21] Osterrich Akad Wissensch, Inst Hochenergiephys, A-10560 Vienna, Austria

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

[23] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

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

[25] Sezione INFN Perugia, I-06100 Perugia, Italy

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

[27] Sezione INFN Pisa, I-56100 Pisa, Italy

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

[29] Univ Gesamthsch Siegen, Fachbereich Phys, D-57068 Siegen, Germany

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

[31] Sezione INFN Torino, I-10125 Turin, Italy

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

[33] Osterr Akad Wissensch, Inst Hochenergiephys, A-10560 Vienna, Austria

[34] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy

[35] Univ Mediterrane, CNRS, Ctr Phys Particules Marseille, Marseille, France

来源：

PHYSICS LETTERS B | 2003年 / 576卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.physletb.2003.10.001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for the decay K-S --> pi(0)e(+)e(-) has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity KS beam, 7 events were found with a background of 0.15 events.. The branching fraction BR(K-S --> pi(0)e(+)e(-), m(ee) > 0.165 GeV/c(2)) = (3.0(-1.2)(+1.5) (stat)+/-0.2(syst)) x 10(-9) has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(K-S --> pi(0)e(+)e(-)) = (5.8(-2.4)(+2.9)) x 10(-9). (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：43 / 54

页数：12

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