We present the first measurements of the absolute branching fractions of Ξc+ decays into Ξ−π+π+ and pK−π+ final states. Our analysis is based on a data set of (772±11)×10^6 BB pairs collected at the Y(4S) resonance with the Belle detector at the KEKB e+e− collider. We measure the absolute branching fraction of B0→ Λc−Ξc+ with the Ξc+ recoiling against Λc- in B0 decays resulting in B(B0→Λc−Ξc+)=[1.16±0.42(stat.)±0.15(syst.)]×10^−3. We then measure the product branching fractions B(B0→Λc−Ξc+)B(Ξc+→Ξ−π+π+) and B(B0→Λc−Ξc+)B(Ξc+→pK−π+). Dividing these product branching fractions by B0→Λc−Ξc+ yields B(Ξc+→Ξ−π+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξc+→pK−π+)=[0.45±0.21(stat.)±0.07(syst.)]%. Our result for B(Ξc+→Ξ−π+π+) can be combined with Ξc+ branching fractions measured relative to Ξc+→Ξ−π+π+ to set the absolute scale for many Ξc+ branching fractions.
First measurements of absolute branching fractions of the Ξc+ baryon at Belle
F. Tenchini;
2019-01-01
Abstract
We present the first measurements of the absolute branching fractions of Ξc+ decays into Ξ−π+π+ and pK−π+ final states. Our analysis is based on a data set of (772±11)×10^6 BB pairs collected at the Y(4S) resonance with the Belle detector at the KEKB e+e− collider. We measure the absolute branching fraction of B0→ Λc−Ξc+ with the Ξc+ recoiling against Λc- in B0 decays resulting in B(B0→Λc−Ξc+)=[1.16±0.42(stat.)±0.15(syst.)]×10^−3. We then measure the product branching fractions B(B0→Λc−Ξc+)B(Ξc+→Ξ−π+π+) and B(B0→Λc−Ξc+)B(Ξc+→pK−π+). Dividing these product branching fractions by B0→Λc−Ξc+ yields B(Ξc+→Ξ−π+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξc+→pK−π+)=[0.45±0.21(stat.)±0.07(syst.)]%. Our result for B(Ξc+→Ξ−π+π+) can be combined with Ξc+ branching fractions measured relative to Ξc+→Ξ−π+π+ to set the absolute scale for many Ξc+ branching fractions.File | Dimensione | Formato | |
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PhysRevD.100.031101.pdf
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