First test of lepton flavor universality in the charmed baryon decays ωc0 → ω-ℓ+νℓ using data of the Belle experiment

(The Belle Collaboration)

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We present the first observation of the ωc0→ω-μ+νμ decay and present measurements of the branching fraction ratios of the ωc0→ω-ℓ+νℓ decays compared to the reference mode ωc0→ω-π+, (ℓ=e or μ). This analysis is based on 89.5 fb-1, 711 fb-1, and 121.1 fb-1 data samples collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The ωc0 signal yields are extracted by fitting Mωℓ and Mωπ spectra. The branching fraction ratios B(ωc0→ω-e+νe)/B(ωc0→ω-π+) and B(ωc0→ω-μ+νμ)/B(ωc0→ω-π+) are measured to be 1.98±0.13(stat)±0.08(syst) and 1.94±0.18(stat)±0.10(syst), respectively. The ratio of B(ωc0→ω-e+νe)/B(ωc0→ω-μ+νμ) is measured to be 1.02±0.10(stat)±0.02(syst), which is consistent with the expectation of lepton flavor universality.

Original languageEnglish
Article numberL091101
JournalPhysical Review D
Issue number9
Publication statusPublished - 2022 May 1

Bibliographical note

Funding Information:
Y. B. L. acknowledges the support from China Postdoctoral Science Foundation (2020TQ0079). 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 TLPRC (Japan); ARC (Australia); FWF (Austria); the National Natural Science Foundation of China under Contracts No. 11575017, No. 11761141009, No. 11975076, No. 12042509, No. 12135005, No. 12161141008; MSMT (Czechia); ERC Advanced Grant No. 884719 and Starting Grant No. 947006 (European Union); Carl Zeiss Foundation (CZF), DFG, EXC153, and VS (Germany); DAE (Project Identification No. RTI 4002) and DST (India); INFN (Italy); MOE, MSIP, NRF, Radiation Science Research Institute (RSRI), Foreign Large-size Research Facility Application Supporting project (FLRFAS), GSDC of KISTI and KREONET/GLORIAD (Korea); MNiSW and NCN (Poland); the Ministry of Science and Higher Education of the Russian Federation (MSHE), Agreement No. 14.W03.31.0026, and the National Research University Higher School of Economics Basic Research Program, Moscow (HSE UBRC) (Russia); University of Tabuk (Saudi Arabia); ARRS Grants No. J1-9124 and No. P1-0135 (Slovenia); IKERBASQUE (Spain); SNSF (Switzerland); MOE and MOST (Taiwan); and DOE and NSF (USA).

Publisher Copyright:
© 2022 authors. Published by the American Physical Society.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


Dive into the research topics of 'First test of lepton flavor universality in the charmed baryon decays ωc0 → ω-ℓ+νℓ using data of the Belle experiment'. Together they form a unique fingerprint.

Cite this