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09 July 2020
 
  » arxiv » 0909.4666

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Experimental search for radiative decays of the pentaquark baryon Theta^+(1540)
V.V. Barmin ; A.E. Asratyan ; V.S. Borisov ; C. Curceanu ; G.V. Davidenko ; A.G. Dolgolenko ; C. Guaraldo ; M.A. Kubantsev ; I.F. Larin ; V.A. Matveev ; V.A. Shebanov ; N.N. Shishov ; L.I. Sokolov ; G.K. Tumanov ; V.S. Verebryusov ;
Date 25 Sep 2009
AbstractThe data on the reactions K^+Xe --> K^0 gamma X and K^+Xe --> K^+ gamma X, obtained with the bubble chamber DIANA, have been analyzed for possible radiative decays of the Theta^+(1540) baryon: Theta^+ --> K^0 p gamma and Theta^+ --> K^+ n gamma. No signals have been observed, and we derive the upper limits Gamma(Theta^+ --> K^0 p gamma) / Gamma(Theta^+ --> K^0 p) < 0.032 and Gamma(Theta^+ --> K^+ n gamma) / Gamma(Theta^+ --> K^+ n) < 0.041 which, using our previous measurement of Gamma(Theta^+ --> KN) = (0.39+-0.10) MeV, translate to Gamma(Theta^+ --> K^0 p gamma) < 8 keV and Gamma(Theta^+ --> K^+ n gamma) < 11 keV at 90% confidence level. We have also measured the cross sections of K^+ -induced reactions involving emission of a neutral pion: sigma(K^+n --> K^0 p pi^0) = (68+-18) mub and sigma(K^+N --> K^+ N pi^0) = (30+-8) mub for incident K^+ momentum of 640 MeV.
Source arXiv, 0909.4666
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