First test of lepton flavor universality in the charmed baryon decays Omega(0)(c) -> Omega(-)l(+)nu(l) using data of the Belle experiment

Belle Collaboration,Y. B. Li,C. P. Shen,I. Adachi,H. Aihara,S. Al Said,D. M. Asner, H. Atmacan,T. Aushev, R. Ayad, V. Babu, S. Bahinipati,P. Behera, K. Belous,J. Bennett,F. Bernlochner, M. Bessner,B. Bhuyan, T. Bilka,A. Bobrov,D. Bodrov, J. Borah,A. Bozek, M. Bracko, P. Branchini,T. E. Browder, A. Budano, M. Campajola, D. Cervenkov,M. -C. Chang,P. Chang, V. Chekelian, A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro,S. Cunliffe,N. Dash,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua, J. Dingfelder,Z. Dolezal, T. V. Dong, T. Ferber, D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gaur, N. Gabyshev,A. Giri, P. Goldenzweig, B. Golob, E. Graziani, K. Gudkova,C. Hadjivasiliou, T. Hara, K. Hayasaka,H. Hayashii,M. T. Hedges,W. -S. Hou, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh,M. Iwasaki, Y. Iwasaki,W. W. Jacobs,E. -J. Jang, S. Jia, Y. Jin, K. K. Joo,J. Kahn, K. H. Kang, T. Kawasaki, H. Kichimi, C. Kiesling,C. H. Kim,D. Y. Kim,K. -H. Kim,K. T. Kim,Y. -K. Kim,K. Kinoshita, P. Kodys,T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Krizan,R. Kroeger,P. Krokovny,M. Kumar, R. Kumar,K. Kumara, A. Kuzmin,Y. -J. Kwon, K. Lalwani,T. Lam, M. Laurenza,S. C. Lee, J. Li,L. K. Li,Y. Li,L. Li Gioi, J. Libby, K. Lieret, D. Liventsev,A. Martini,M. Masuda, D. Matvienko,S. K. Maurya,M. Merola, K. Miyabayashi, R. Mizuk,G. B. Mohanty, M. Nakao, D. Narwal,A. Natochii,L. Nayak, M. Nayak,N. K. Nisar, S. Nishida,K. Ogawa,S. Ogawa,H. Ono, P. Oskin,P. Pakhlov, G. Pakhlova,T. Pang, S. Pardi,S. -H. Park,S. Patra,S. Paul,T. K. Pedlar, R. Pestotnik,L. E. Piilonen, T. Podobnik, E. Prencipe,M. T. Prim,M. Rohrken, A. Rostomyan,N. Rout,G. Russo,D. Sahoo, S. Sandilya,A. Sangal, L. Santelj, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo,M. E. Sevior, M. Shapkin,C. Sharma, V. Shebalin,J. -G. Shiu, B. Shwartz,J. B. Singh,A. Sokolov, E. Solovieva, M. Staric,Z. S. Stottler, M. Sumihama, T. Sumiyoshi,M. Takizawa,U. Tamponi, K. Tanida, F. Tenchini,M. Uchida,T. Uglov, Y. Unno,K. Uno,S. Uno, P. Urquijo, S. E. Vahsen,R. Van Tonder, G. Varner, A. Vinokurova,E. Waheed,D. Wang,E. Wang, M. -Z. Wang,S. Watanuki, E. Won,X. Xu,B. D. Yabsley,W. Yan, S. B. Yang,H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Y. Zhai, Z. P. Zhang,V. Zhilich,V. Zhukova

PHYSICAL REVIEW D（2022）

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摘要

We present the first observation of the Omega(0)(c) -> Omega(-)mu(+)nu(mu) decay and present measurements of the branching fraction ratios of the Omega(0)(c) -> Omega(-)l(+)nu(l) decays compared to the reference mode Omega(0)(c) -> Omega(-)pi(+), (l = e or mu). 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 Omega(0)(c) signal yields are extracted by fitting M-Omega l' and M-Omega pi spectra. The branching fraction ratios B(Omega(0)(c) -> Omega(-)e(+)nu(e))/B(Omega(0)(c) -> Omega(-)pi(+)) and B(Omega(0)(c) -> Omega(-)mu(+)nu(mu))/B(Omega(0)(c) -> Omega(-)pi(+)) 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(Omega(0)(c) -> Omega(-)e(+)nu(e))/B(Omega c0 -> Omega(-)mu(+)nu(mu)) is measured to be 1.02 +/- 0.10(stat) +/- 0.02(syst), which is consistent with the expectation of lepton flavor universality.

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