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First measurements of absolute branching fractions of the $$Xi_c^0$$ baryon at Belle

Belle実験における$$Xi_c^0$$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161名*

Li, Y. B.*; Tanida, Kiyoshi; Belle Collaboration*; 161 of others*

We present the first measurements of absolute branching fractions of $$Xi_c^0$$ decays into $$Xi^- pi^+$$, $$Lambda K^- pi^+$$, and $$p K^- K^- pi^+$$ final states. The measurements are made using a data set comprising $$(772pm 11)times 10^{6}$$ $$Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB $$e^+e^-$$ collider. We first measure the absolute branching fraction for $$B^- to bar{Lambda}_c^- Xi_c^0$$ using a missing-mass technique, the result is $${cal B}(B^- to bar{Lambda}_c^- Xi_c^0) = [9.51 pm 2.10(rm stat.) pm 0.88(rm syst.)] times 10^{-4}$$. We subsequently measure the product branching fractions $${cal B}(B^- to bar{Lambda}_c^- Xi_c^0){cal B}(Xi_c^0 to Xi^- pi^+)$$, $${cal B}(B^- to bar{Lambda}_c^- Xi_c^0) {cal B}(Xi_c^0 to Lambda K^- pi^+)$$, and $${cal B}(B^- to bar{Lambda}_c^- Xi_c^0) {cal B}(Xi_c^0 to p K^- K^- pi^+)$$ with improved precision. Dividing these product branching fractions by the result for $$B^- to bar{Lambda}_c^- Xi_c^0$$ yields the following branching fractions: $${cal B}(Xi_c^0 to Xi^- pi^+)= [1.80 pm 0.50(rm stat.) pm 0.14(rm syst.)]%$$, $${cal B}(Xi_c^0 to Lambda K^- pi^+)=[1.17 pm 0.37(rm stat.) pm 0.09(rm syst.)]%$$, and $${cal B}(Xi_c^0 to p K^- K^- pi^+)=[0.58 pm 0.23(rm stat.) pm 0.05(rm syst.)]%$$. Our result for $${cal B}(Xi_c^0 to Xi^- pi^+)$$ can be combined with $$Xi_c^0$$ branching fractions measured relative to $$Xi_c^0 to Xi^- pi^+$$ to yield other absolute $$Xi_c^0$$ branching fractions.

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パーセンタイル:90.14

分野:Physics, Multidisciplinary

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