First measurements of absolute branching fractions of the baryon at Belle

Li, Y. B.*; Tanida, Kiyoshi ; Belle Collaboration*; 194 of others*

We present the first measurements of the absolute branching fractions of decays into and final states. Our analysis is based on a data set of $(772pm 11)times 10^{6}$ pairs collected at the resonance with the Belle detector at the KEKB collider. We measure the absolute branching fraction of $bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$ with the recoiling against $bar{Lambda}_c^-$ in $bar{B}^0$ decays resulting in ${cal B}(bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}) = [1.16 pm 0.42(rm stat.) pm 0.15(rm syst.)] times 10^{-3}$ . We then measure the product branching fractions ${cal B}(bar{B}^{0} to bar{Lambda}_c^- Xi_c^+){cal B}(Xi_c^+ to Xi^- pi^+ pi^+)$ and ${cal B}(bar{B}^{0} to bar{Lambda}_c^- Xi_c^+){cal B}(Xi_c^+ to p K^- pi^+)$ . Dividing these product branching fractions by $bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$ yields: ${cal B}(Xi_c^+ to Xi^- pi^+ pi^+) = [2.86 pm 1.21(rm stat.) pm 0.38(rm syst.)]%$ and ${cal B}(Xi_c^+ to p K^- pi^+)=[0.45 pm 0.21(rm stat.) pm 0.07(rm syst.)]%$ . Our result for ${cal B}(Xi_c^+ to Xi^- pi^+ pi^+)$ can be combined with branching fractions measured relative to to set the absolute scale for many branching fractions.

Language	:	English
Journal	:	Physical Review D
Volume	:	100
Number	:	3
Pages	:	p.031101_1 - 031101_8
Publication Year/Month	:	2019/08
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Paper URL	:	https://doi.org/10.1103/PhysRevD.100.031101
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Cooperating Institute	:	高エネルギー加速器研究機構

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Registration No. : AA20190585
JAEA Abstracts No. : 48000251
Paper Submission No. : 22591

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