検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

First measurements of absolute branching fractions of the $$Xi_c^+$$ baryon at Belle

Belle実験における$$Xi_c^+$$バリオンの崩壊分岐比の初絶対測定

Li, Y. B.*; 谷田 聖; Belle Collaboration*; 他194名*

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

We present the first measurements of the absolute branching fractions of $$Xi_c^+$$ decays into $$Xi^- pi^+ pi^+$$ and $$p K^- pi^+$$ final states. Our analysis is based on a data set of $$(772pm 11)times 10^{6}$$ $$Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB $$e^+e^-$$ collider. We measure the absolute branching fraction of $$bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$$ with the $$Xi_c^+$$ 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 $$Xi_c^+$$ branching fractions measured relative to $$Xi_c^+ to Xi^- pi^+ pi^+$$ to set the absolute scale for many $$Xi_c^+$$ branching fractions.

Access

:

- Accesses

InCites™

:

パーセンタイル:49.94

分野:Astronomy & Astrophysics

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.