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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. G.; Ayan, A. S.; Balatz, M. Y.; Blanco-Covarrubias, A.; Bondar, N. F.; Cooper, P. S.; Dauwe, L. J.; Davidenko, G. V.; Dersch, U.; Dolgolenko, A. G.; Dzyubenko, G. B.; Edelstein, R.; Emediato, L.; Endler, A. M. F.; Eschrich, I.; Eschrich, I.

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    <subfield code="a">We report the first observation of two Cabibbo-suppressed ecay modes, Xi(+)(c) -&amp;gt; Sigma(+)pi(-)pi(+) and Xi c+ -&amp;gt; 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+ -&amp;gt; Xi(-)pi(+)pi(+) are measured to be B(Xi(+)(c) -&amp;gt; Sigma(+)pi(-)pi(+))/B(Xi(+)(c) -&amp;gt; Xi(-)pi(+)pi(+)) = 0.48 +/- 0.20, and B(Xi(+)(c) -&amp;gt; Sigma(-)pi(+)pi(+))/B(Xi(+)(c) -&amp;gt; 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) -&amp;gt; pK(-)pi(+.) (C) 2008 Elsevier B.V. All rights reserved.</subfield>
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Yayınlanma tarihi:
01/01/2008
Yayınlandığı yer:
PHYSICS LETTERS B: 666 pp. 299-304.
Lisans:
Creative Commons Attribution

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