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Article

First measurements of absolute branching fractions of the Ξc 0 Baryon at Belle

Aushev T., Mizuk R., Pakhlov P., Pakhlova G., Popov V., Uglov T., Li Y., Belle C.

We present the first measurements of the absolute branching fractions of Ξ+c decays into Ξ−π+π+ and pKπ+ final states. Our analysis is based on a data set of (772±11)×106 BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e− collider. We measure the absolute branching fraction of B¯0→Λ¯−cΞ+c with the Ξ+c recoiling against Λ¯−c in B¯0 decays resulting in B(B¯0→Λ¯−cΞ+c)=[1.16±0.42(stat.)±0.15(syst.)]×10−3 . We then measure the product branching fractions B(B¯0→Λ¯−cΞ+c)B(Ξ+c→Ξ−π+π+) and B(B¯0→Λ¯−cΞ+c)B(Ξ+cpKπ+) . Dividing these product branching fractions by B¯0→Λ¯−cΞ+c yields: B(Ξ+c→Ξ−π+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξ+cpKπ+)=[0.45±0.21(stat.)±0.07(syst.)]% . Our result for B(Ξ+c→Ξ−π+π+) can be combined with Ξ+c branching fractions measured relative to Ξ+c→Ξ−π+π+ to set the absolute scale for many Ξ+c branching fractions.