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.
2019
Li, Y.  B.; Shen, C.  P.; Adachi, I.; Ahn, J.  K.; Aihara, H.; Al Said, S.; Asner, D.  M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.; Bakich, A.  M....espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevD.100.031101.pdf

accesso aperto

Tipologia: Versione finale editoriale
Licenza: Creative commons
Dimensione 332.96 kB
Formato Adobe PDF
332.96 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1249429
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 34
  • ???jsp.display-item.citation.isi??? 26
social impact