Measurement of the Ξ0→Λγ decay asymmetry and branching fraction -: NA48 collaboration

被引：9

作者：

Lai, A

Marras, D

Bevan, A

Dosanjh, RS

Gershon, TJ

Hay, B

Kalmus, GE

Lazzeroni, C

Munday, DJ

Olaiya, E

Parker, MA

White, TO

Wotton, SA

Barr, G

Bocquet, G

Ceccucci, A

Cuhadar-Dönszelmann, 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

Taureg, H

Velasco, M

Wahl, H

Cheshkov, C

Gaponenko, A

Hristov, P

Kekelidze, V

Madigojine, D

Molokanova, N

Potrebenikov, Y

Tatishvili, G

Tkatchev, A

Zinchenko, A

Knowles, I

Martin, V

Sacco, R

Walker, A

Contalbrigo, M

Dalpiaz, P

机构：

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

[2] Sez INFN 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 141980, Russia

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

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

[8] SEz INFN Ferrara, I-44100 Ferrara, Italy

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

[10] Sez INFN Firenze, I-50125 Florence, Italy

[11] Univ Paris 11, CNRS, IN2P3, Lab Accelerateur Lineaire, F-91898 Orsay, France

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

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

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

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

[16] CEA Saclay, DSM, DAPNIA, 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] Sez INFN Torino, I-10125 Turin, Italy

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

[21] Austrian Acad Sci, Inst Hochenergiephys, A-1050 Vienna, Austria

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

来源：

PHYSICS LETTERS B | 2004年 / 584卷 / 3-4期

关键词：

D O I：

10.1016/j.physletb.2004.01.041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Xi(0) --> Lambdagamma have been found with an estimated background of 58 +/- 8 events. From these events the Xi(0) --> Lambdagamma decay asymmetry has been determined to alpha(Xi(0) --> Lambdagamma) = -0.78 +/- 0.18(stat) +/- 0.06(syst), which is the first evidence of a decay asymmetry in Xi(0) --> Lambdagamma. The branching fraction of the decay has been measured to be Br(Xi(0) --> Lambdagamma) = (1.16 +/- 0.05(stat) +/- 0.06(syst)) x 10(-3). (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：251 / 259

页数：9

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