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

Date Issued
01-05-2022
Author(s)
Li, Y. B.
Shen, C. P.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Atmacan, H.
Aushev, T.
Ayad, R.
Babu, V.
Bahinipati, S.
Behera, P.
Belous, K.
Bennett, J.
Bernlochner, F.
Bessner, M.
Bhuyan, B.
Bilka, T.
Bobrov, A.
Bodrov, D.
Borah, J.
Bozek, A.
BraÄ ko, M.
Branchini, P.
Browder, T. E.
Budano, A.
Campajola, M.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, H. E.
Cho, K.
Cho, S. J.
Choi, S. K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Dash, N.
De Nardo, G.
De Pietro, G.
Dhamija, R.
Di Capua, F.
Dingfelder, J.
DoleŽal, Z.
Dong, T. V.
Ferber, T.
Ferlewicz, D.
Fulsom, B. G.
Garg, R.
Gaur, V.
Gabyshev, N.
Giri, A.
Goldenzweig, P.
Golob, B.
Graziani, E.
Gudkova, K.
Hadjivasiliou, C.
Hara, T.
Hayasaka, K.
Hayashii, H.
Hedges, M. T.
Hou, W. S.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jang, E. J.
Jia, S.
Jin, Y.
Joo, K. K.
Kahn, J.
Kang, K. H.
Kawasaki, T.
Kichimi, H.
Kiesling, C.
Kim, C. H.
Kim, D. Y.
Kim, K. H.
Kim, K. T.
Kim, Y. K.
Kinoshita, K.
Kodyš, P.
Konno, T.
Korobov, A.
Korpar, S.
Kovalenko, E.
KriŽan, P.
Kroeger, R.
Krokovny, P.
Kumar, M.
Kumar, R.
Kumara, K.
DOI
Abstract
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.
Volume
105