Li, Y and Shen, C P and Giri, Anjan Kumar
First measurements of absolute branching fractions of the Ξc 0 Baryon at Belle.
Physical Review Letters.
ISSN 00319007
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Abstract
We present the first measurements of absolute branching fractions of Ξc 0 decays into Ξπ+, ΛKπ+, and pKKπ+ final states. The measurements are made using a dataset comprising (772±11)×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB e+ecollider. We first measure the absolute branching fraction for B→Λ̄cΞc 0 using a missingmass technique; the result is B(B→Λ̄cΞc 0 )=(9.51±2.10±0.88)×104. We subsequently measure the product branching fractions B(B→Λ̄cΞc 0 )B(Ξc 0 →Ξπ+), B(B→Λ̄cΞc 0 )B(Ξc 0 →ΛKπ+), and B(B→Λ̄cΞc 0 )B(Ξc 0 →pKKπ+) with improved precision. Dividing these product branching fractions by the result for B→Λ̄cΞc 0 yields the following branching fractions: B(Ξc 0 →Ξπ+)=(1.80±0.50±0.14)%, B(Ξc 0 →ΛKπ+)=(1.17±0.37±0.09)%, and B(Ξc 0 →pKKπ+)=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξc 0 →Ξπ+) can be combined with Ξc 0 branching fractions measured relative to Ξc 0 →Ξπ+ to yield other absolute Ξc 0 branching fractions.
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