arXiv · 2112.10367
First test of Lepton Flavor Universality in the charmed baryon decays $\Omega^{0}_{c} \to \Omega^{-} \ell^{+} \nu_{\ell}$ using data of the Belle experiment
Abstract
We present the first observation of the $\Omega_{c}^{0} \to \Omega^{-} \mu^{+} \nu_{\mu}$ decay and present measurements of the branching fraction ratios of the $\Omega_{c}^{0} \to \Omega^{-} \ell^{+} \nu_{\ell}$ decays compared to the reference mode $\Omega_{c}^{0} \to \Omega^{-} \pi^+$, ($\ell = e$ 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 $\Omega_{c}^{0}$ signal yields are extracted by fitting $M_{\Omega^{-} \ell^{+}}$ and $M_{\Omega^{-}\pi^+}$ spectra. The branching fraction ratios ${\cal B}(\Omega_{c}^{0} \to \Omega^{-} e^{+} \nu_{e})/{\cal B}(\Omega_{c}^{0} \to \Omega^{-} \pi^+)$ and ${\cal B}(\Omega_{c}^{0} \to \Omega^{-} \mu^{+} \nu_{\mu})/{\cal B}(\Omega_{c}^{0} \to \Omega^{-} \pi^+)$ are measured to be $1.98 \pm0.13~({\rm stat.}) \pm 0.08~({\rm syst.})$ and $ 1.94 \pm 0.18~({\rm stat.}) \pm 0.10~({\rm syst.})$, respectively. The ratio of ${\cal B}(\Omega_{c}^{0} \to \Omega^{-} e^{+} \nu_{e})/{\cal B}(\Omega_{c}^{0} \to \Omega^{-} \mu^{+} \nu_{\mu})$ is measured to be $1.02 \pm 0.10~({\rm stat.}) \pm 0.02~({\rm syst.})$, which is consistent with the expectation of lepton flavor universality.
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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. 2021-12-20. First test of Lepton Flavor Universality in the charmed baryon decays $\Omega^{0}_{c} \to \Omega^{-} \ell^{+} \nu_{\ell}$ using data of the Belle experiment. https://doi.org/10.1103/physrevd.105.l091101
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