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29 March 2024
 
  » arxiv » hep-ex/0410049

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Experimental study of direct photon emission in K- --> pi- pi0 gamma decay using ISTRA+ detector
V.A. Uvarov ; S.A. Akimenko ; G.I. Britvich ; K.V. Datsko ; A.P. Filin ; A.V. Inyakin ; V.A. Khmelnikov ; A.S. Konstantinov ; V.F. Konstantinov ; I.Y. Korolkov ; V.M. Leontiev ; V.P. Novikov ; V.F. Obraztsov ; V.A. Polyakov ; V.I. Romanovsky ; V.M. Ronjin ; V.I. Shelikhov ; N.E. Smirnov ; O.G. Tchikilev ; O.P. Yushchenko ; V.N. Bolotov ; V.A. Duk ; S.V. Laptev ; A.Yu. Polyarush ;
Date 19 Oct 2004
Subject hep-ex
AffiliationInstitute for High Energy Physics, Protvino, Russia), V.N. Bolotov, V.A. Duk, S.V. Laptev, A.Yu. Polyarush (Institute for Nuclear Research, Moscow, Russia
AbstractThe branching ratio in the charged-pion kinetic energy region of 55 to 90 MeV for the direct photon emission in the K- --> pi- pi0 gamma decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=[0.37+-0.39(stat)+-0.10(syst)]*10^(-5) obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions.
Source arXiv, hep-ex/0410049
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