Y B, Li and C P, Shen and Giri, Anjan Kumar and et al, .
First measurements of absolute branching fractions of the Ξc+ baryon at Belle.
Physical Review D, 100 (3).
ISSN 24700010
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Abstract
We present the first measurements of the absolute branching fractions of Ξc+ decays into Ξπ+π+ and pKπ+ final states. Our analysis is based on a data set of (772±11)×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e collider. We measure the absolute branching fraction of B̄0→Λ̄cΞc+ with the Ξc+ recoiling against Λ̄c in B̄0 decays resulting in B(B̄0→Λ̄cΞc+)=[1.16±0.42(stat.)±0.15(syst.)]×103. We then measure the product branching fractions B(B̄0→Λ̄cΞc+)B(Ξc+→Ξπ+π+) and B(B̄0→Λ̄cΞc+)B(Ξc+→pKπ+). Dividing these product branching fractions by B̄0→Λ̄cΞc+ yields B(Ξc+→Ξπ+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξc+→pKπ+)=[0.45±0.21(stat.)±0.07(syst.)]%. Our result for B(Ξc+→Ξπ+π+) can be combined with Ξc+ branching fractions measured relative to Ξc+→Ξπ+π+ to set the absolute scale for many Ξc+ branching fractions.
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