First observation of the Cabibbo-suppressed decays Xi(+)(c)->Sigma(+)pi(-)pi(+) and Xi(+)(c)->Sigma(-)pi(+)pi(+) and measurement of their branching ratios

Vazquez-Jauregui, E.; Engelfried, J.; Akgun, U.; Alkhazov, G.; Amaro-Reyes, J.; Atamantchouk, A.; Ayan, A.; Balatz, M.; Blanco-Covarrubias, A.; Bondar, N.; Cooper, P.; Dauwe, L.; Davidenko, G.; Dersch, U.; Dolgolenko, A.; Dzyubenko, G.; Edelstein, R.; Emediato, L.; Endler, A.; Eschrich, I.; Escobar, C.; Estrada, N.; Evdokimov, A.; Filimonov, I.; Garcia, F.; Gaspero, M.; Giller, I.; Golovtsov, V.; Gouffon, P.; Guelmez, E.; Kangling, He; Iori, M.; Jun, S.; Kaya, M.; Kilmer, J.; Kim, V.; Kochenda, L.; Konorov, I.; Kozhevnikov, A.; Krivshich, A.; Krueger, H.; Kubantsev, M.; Kubarovsky, V.; Kulyavtsev, A.; Kuropatkin, N.; Kurshetsov, V.; Kushnirenko, A.; Kwan, S.; Lache, J.; Lamberto, A.; Landsberg, L.; Larin, I.; Leikin, E.; Yunshan, Li; Lopez-Hinojosa, G.; Luksys, M.; Lungov, T.; Maleev, V.; Mao, D.; Mao Chensheng, Mao; Mao Zhenlin, Mao; Mathew, P.; Mattson, M.; Matveev, V.; McCliment, E.; Moinester, M.; Molchanov, V.; Morelos, A.; Nelson, K.; Nemitkin, A.; Neoustroev, P.; Newsom, C.; Nilov, A.; Nurushev, S.; Ocherashvili, A.; Onel, Y.; Ozel, E.; Ozkorucuklu, Suat; Penzo, A.; Petrenko, S.; Pogodin, P.; Procario, M.; Prutskoi, V.; Ramberg, E.; Rappazzo, G.; Razmysiovich, B.; Rud, V.; Russ, J.; Sanchez-Lopez, J.; Schiavon, P.; Simon, J.; Sitnikov, A.; Skow, D.; Smith, V.; Srivastava, M.; Steiner, V.; Stepanov, V.; Stutte, L.; Svoiski, M.; Terentyev, N.; Thomas, G.; Torres, I.; Uvarov, L.; Vasiliev, A.; Vavilov, D.; Verebryusov, V.; Victorov, V.; Vishnyakov, V.; Vorobyov, A.; Vorwalter, K.; You, J.; Zhao Wenheng, Zhao; Zheng Shuchen, Zheng; Zukanovich-Funchal, R.

doi:10.1016/j.physletb.2008.07.072

First observation of the Cabibbo-suppressed decays Xi(+)(c)->Sigma(+)pi(-)pi(+) and Xi(+)(c)->Sigma(-)pi(+)pi(+) and measurement of their branching ratios

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Vazquez-Jauregui E., Engelfried J., Akgun U., Alkhazov G., Amaro-Reyes J., Atamantchouk A. G., ...More

PHYSICS LETTERS B, vol.666, no.4, pp.299-304, 2008 (SCI-Expanded)

Publication Type: Article / Article
Volume: 666 Issue: 4
Publication Date: 2008
Doi Number: 10.1016/j.physletb.2008.07.072
Journal Name: PHYSICS LETTERS B
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Page Numbers: pp.299-304
Istanbul University Affiliated: No

Abstract

We report the first observation of two Cabibbo-suppressed ecay modes, Xi(+)(c) -> Sigma(+)pi(-)pi(+) and Xi c+ -> Sigma(-)pi(+)pi(+). We observe 59 +/- 14 over a background of 87, and 22 +/- 8 over a background of 13 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 Gev/c Sigma(-) beam. The branching ratios of the decays relative to the Cabibbo-favored Xi c+ -> Xi(-)pi(+)pi(+) are measured to be B(Xi(+)(c) -> Sigma(+)pi(-)pi(+))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = 0.48 +/- 0.20, and B(Xi(+)(c) -> Sigma(-)pi(+)pi(+))/B(Xi(+)(c) -> Sigma(-)pi(+)pi(+)) = 0.18 +/- 0.09, respectively. We also report branching ratios for the same decay modes of the Delta(+)(c) relative to Delta(+)(c) -> pK(-)pi(+.) (C) 2008 Elsevier B.V. All rights reserved.