First measurements of absolute branching fractions of the Ξc+ baryon at Belle

(Belle Collaboration)

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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)×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e- collider. We measure the absolute branching fraction of B̄0→Λ̄c-Ξc+ with the Ξc+ recoiling against Λ̄c- in B̄0 decays resulting in B(B̄0→Λ̄c-Ξc+)=[1.16±0.42(stat.)±0.15(syst.)]×10-3. We then measure the product branching fractions B(B̄0→Λ̄c-Ξc+)B(Ξc+→Ξ-π+π+) and B(B̄0→Λ̄c-Ξc+)B(Ξc+→pK-π+). Dividing these product branching fractions by B̄0→Λ̄c-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.

Original languageEnglish
Article number031101
JournalPhysical Review D
Issue number3
Publication statusPublished - 2019 Aug 12

Bibliographical note

Funding Information:
We thank Professor Fu-sheng Yu for useful discussions and comments. We thank the KEKB group for excellent operation of the accelerator; the KEK cryogenics group for efficient solenoid operations; and the KEK computer group, the NII, and PNNL/EMSL for valuable computing and SINET5 network support. We acknowledge support from MEXT, JSPS and Nagoya’s the Tau-Lepton Physics Research Center (TLPRC) (Japan); ARC (Australia); FWF (Austria); National Natural Science Foundation of China (NSFC) under Contracts No. 11475187, No. 11521505, No. 11575017, No. 11761141009, and the Chinese Academy of Science Center for Excellence in Particle Physics (CCEPP) (China); MSMT (Czechia); the CarlZeiss Foundation (CZF), DFG, the Excellence Cluster Universe (EXC153), and the VolkswagenStiftung (VS) (Germany); DST (India); INFN (Italy); MOE, MSIP, NRF, RSRI, Foreign Large-size Research Facility Application Supporting project (FLRFAS) project and GSDC of KISTI and Korea Research Environment Open Network (KREONET)/Global Ring Network for Advanced Application Development (GLORIAD)(Korea); MNiSW and NCN (Poland); Ministry of Science and Higher Education of the Russian Federation (MSHE), Grant No. 14.W03.31.0026 (Russia); ARRS (Slovenia); IKERBASQUE (Spain); SNSF (Switzerland); MOE and MOST (Taiwan); and DOE and NSF (USA).

Publisher Copyright:
© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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