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Measurement of the $\Xi^0 \rightarrow \Lambda gamma$ decay asymmetry and branching fraction

A. Lai D. Marras A. Bevan R S. Dosanjh T J. Gershon B. Hay G E. Kalmus C. Lazzeroni D J. Munday E. Olaiya M A. Parker T O. White S A. Wotton G. Barr G. Bocquet A. Ceccucci T. Cuhadar-Donszelmann D. Cundy G. d'Agostini N. Doble V. Falaleev L. Gatignon A. Gonidec B. Gorini G. Govi P. Grafstrom W. Kubischta A. Lacourt A. Norton S. Palestini B. Panzer-Steindel H. Taureg M. Velasco H. Wahl C. Cheshkov A. Gaponenko P. Hristov V D. Kekelidze D. Madigojine N. Molokanova Yu. Potrebenikov G. Tatishvili A. Tkatchev A. Zinchenko I. Knowles V. Martin R. Sacco A. Walker M. Contalbrigo P. Dalpiaz J. Duclos P L. Frabetti A. Gianoli M. Martini F. Petrucci M. Savrie A. Bizzeti M. Calvetti G. Collazuol G. Graziani E. Iacopini M. Lenti F. Martelli M. Veltri H.G. Becker K. Eppard M. Eppard H. Fox A. Kalter K. Kleinknecht U. Koch L. Kopke P. Lopesdasilva P. Marouelli I. Pellmann A. Peters B. Renk S A. Schmidt V. Schonharting Y. Schue R. Wanke A. Winhart M. Wittgen J C. Chollet 1 L. Fayard 1 L. Iconomidou-Fayard 1 J. Ocariz 1 G. Unal 1 I. Wingerter-Seez 1 G. Anzivino P. Cenci E. Imbergamo P. Lubrano A. Mestvirishvili A. Nappi M. Pepe M. Piccini L. Bertanza R. Carosi R. Casali C. Cerri M. Cirilli F. Costantini R. Fantechi S. Giudici I. Mannelli G. Pierazzini M. Sozzi J B. Cheze J. Cogan M. de Beer P. Debu A. Formica R. Granier de Cassagnac E. Mazzucato B. Peyaud R. Turlay B. Vallage M. Holder A. Maier M. Ziolkowski R. Arcidiacono C. Biino N. Cartiglia R. Guida F. Marchetto E. Menichetti N. Pastrone J. Nassalski E. Rondio M. Szleper W. Wislicki S. Wronka H. Dibon G. Fisher M. Jeitler M. Markytan I. Mikulec G. Neuhofer M. Pernicka A. Taurok L. Widhalm
Abstract : In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Xi0 -> Lambda gamma have been found with an estimated background of 58+-8 events. From these events the Xi0 -> Lambda gamma decay asymmetry has been determined to alpha(Xi0 -> Lambda gamma) = -0.78 +- 0.18_stat +- 0.06_syst, which is the first evidence of a decay asymmetry in Xi0 -> Lambda gamma. The branching fraction of the decay has been measured to be Br(Xi0 -> Lambda gamma) = (1.16 +- 0.05_stat +- 0.06_syst) x 10^-3.
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Submitted on : Monday, June 14, 2004 - 3:46:39 PM
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A. Lai, D. Marras, A. Bevan, R S. Dosanjh, T J. Gershon, et al.. Measurement of the $\Xi^0 \rightarrow \Lambda gamma$ decay asymmetry and branching fraction. Physics Letters B, Elsevier, 2004, 584, pp.251-259. ⟨in2p3-00021887⟩

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