Measurements of the branching fractions of semileptonic decays $\Xi_{c}^{0} \to \Xi^{-} \ell^{+} \nu_{\ell}$ and asymmetry parameter of $\Xi_{c}^{0} \to \Xi^{-} \pi^{+}$ decay
Creators: name: Li, Y. B.
name: Shen, C. P.
name: Adachi, I.
name: Adamczyk, K.
name: Aihara, H.
name: Al Said, S.
name: Asner, D. M.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Behera, P.
name: Bennett, J.
name: Bessner, M.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bilka, T.
name: Biswal, J.
name: Bonvicini, G.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Campajola, M.
name: Cervenkov, D.
name: Chang, M.-C.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, K.
name: Cho, S.-J.
name: Choi, S.-K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: Cunliffe, S.
name: Das, S.
name: Dash, N.
name: De Nardo, G.
name: Dhamija, R.
name: Di Capua, F.
name: Dong, T. V.
name: Eidelman, S.
name: Epifanov, D.
name: Ferber, T.
name: Fulsom, B. G.
name: Garg, R.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Giri, A.
name: Goldenzweig, P.
name: Grzymkowska, O.
name: Gudkova, K.
name: Hadjivasiliou, C.
name: Hartbrich, O.
name: Hayasaka, K.
name: Hayashii, H.
name: Villanueva, M. Hernandez
name: Hsu, C.-L.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jia, S.
name: Jin, Y.
name: Joo, C. W.
name: Joo, K. K.
name: Kang, K. H.
name: Karyan, G.
name: Kato, Y.
name: Kichimi, H.
name: Kim, C. H.
name: Kim, D. Y.
name: Kim, K.-H.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Konno, T.
name: Korobov, A.
name: Korpar, S.
name: Kovalenko, E.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kuhr, T.
name: Kumar, M.
name: Kumar, R.
name: Kumara, K.
name: Kuzmin, A.
name: Kwon, Y.-J.
name: Lalwani, K.
name: Lange, J. S.
name: Lee, I. S.
name: Lee, S. C.
name: Li, C. H.
name: Li, L. K.
name: Li Gioi, L.
name: Libby, J.
name: Lieret, K.
name: Liventsev, D.
name: Masuda, M.
name: Matvienko, D.
name: McNeil, J. T.
name: Metzner, F.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moon, T. J.
name: Mori, T.
name: Mussa, R.
name: Natochii, A.
name: Nayak, L.
name: Nayak, M.
name: Niiyama, M.
name: Nisar, N. K.
name: Nishida, S.
name: Nishimura, K.
name: Ogawa, S.
name: Ono, H.
name: Onuki, Y.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pang, T.
name: Pardi, S.
name: Park, H.
name: Patra, S.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Podobnik, T.
name: Popov, V.
name: Prencipe, E.
name: Prim, M. T.
name: Roehrken, Markus
name: Rostomyan, A.
name: Rout, N.
name: Russo, G.
name: Sahoo, D.
name: Sakai, Y.
name: Sandilya, S.
name: Santelj, L.
name: Sanuki, T.
name: Savinov, V.
name: Schnell, G.
name: Schwanda, C.
name: Seino, Y.
name: Senyo, K.
name: Shapkin, M.
name: Sharma, C.
name: Shiu, J.-G.
name: Sokolov, A.
name: Solovieva, E.
name: Starič, M.
name: Stottler, Z. S.
name: Sumihama, M.
name: Tamponi, U.
name: Tanida, K.
name: Tenchini, Francesco
name: Uchida, M.
name: Uehara, S.
name: Uglov, T.
name: Uno, K.
name: Uno, S.
name: Usov, Y.
name: Van Tonder, R.
name: Varner, G.
name: Vinokurova, A.
name: Vossen, A.
name: Wang, C. H.
name: Wang, M.-Z.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Watanuki, S.
name: Won, E.
name: Xu, X.
name: Yan, W.
name: Yang, S. B.
name: Ye, Hua
name: Yin, J. H.
name: Yuan, C. Z.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: electron positron: annihilation
electron positron: colliding beams
decay: asymmetry: measured
lepton: flavor: universality
Xi/c0: branching ratio: measured
branching ratio: ratio: measured
Xi/c0: semileptonic decay
CP: violation
asymmetry: CP
error: statistical
BELLE
KEK-B
experimental results
Xi/c0 --&gt; Xi- positron neutrino/e
Xi/c0 --&gt; Xi- muon+ neutrino/mu
Xi/c0 --&gt; Xi- pi+
10.58 GeV-cms

description: Using a data sample of 89.5 fb$^{-1}$ recorded at the energy $\sqrt{s}=10.52$ GeV with the Belle detector at the KEKB $e^+e^-$ collider, we report measurements of branching fractions of semileptonic decays $\Xi_{c}^{0} \to \Xi^{-} \ell^{+} \nu_{\ell}$ ($\ell=e$ or $\mu$). Furthermore, based on an additional data sample of 711 fb$^{-1}$ at $\sqrt{s} = 10.58$ GeV, the $CP$-asymmetry parameter of $\Xi_{c}^{0} \to \Xi^{-} \pi^{+}$ decay is extracted. The branching fractions are measured to be ${\cal B}(\Xi_{c}^{0} \to \Xi^{-} e^{+} \nu_{e})=(1.72 \pm 0.10 \pm 0.12 \pm 0.50)\%$ and ${\cal B}(\Xi_{c}^{0} \to \Xi^{-} \mu^{+} \nu_{\mu})=(1.71 \pm 0.17 \pm 0.13 \pm 0.50)\%$ with much improved precision compared to the current world average. The first and the second uncertainty are statistical and systematic, respectively, while the third one arises due to the uncertainty of the $\Xi_{c}^{0} \to \Xi^{-} \pi^+$ branching fraction. The corresponding ratio ${\cal B}(\Xi_{c}^{0} \to \Xi^{-} e^{+} \nu_{e})/{\cal B}(\Xi_{c}^{0} \to \Xi^{-} \mu^{+} \nu_{\mu})$ is $1.00 \pm 0.11 \pm 0.09$, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter is found to be consistent with zero, ${\cal A}_{CP} = (\alpha_{\Xi^{-}\pi^{+}} + \alpha_{\bar{\Xi}^{+}\pi^{-}})/(\alpha_{\Xi^{-}\pi^{+}} - \alpha_{\bar{\Xi}^{+}\pi^{-}}) = 0.015 \pm 0.052 \pm 0.017$.