Measurements of the Branching Fractions of the Semileptonic Decays Ξ$$^{0}_{c}$$ → Ξ^–ℓ⁺ν_ℓ and the Asymmetry Parameter of Ξ$$^{0}_{c}$$ → Ξ^–π⁺

Journal Article · 17 September 2021 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.127.121803 · OSTI ID:1821029

Li, Y.  B.; Shen, C.  P. ; Adachi, I.; Adamczyk, K.; Aihara, H.; Al Said, S.; Asner, D.  M.; Aushev, T.; Ayad, R.; Babu, V.; Behera, P.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bilka, T.; Biswal, J.; Bonvicini, G.; Bozek, A.; Bračko, M. ; Browder, T.  E.; Campajola, M.; Červenkov, D.; Chang, M. -C.; Chen, A.; Cheon, B.  G.; Chilikin, K.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Das, S.; Dash, N.; De Nardo, G.; Dhamija, R.; Di Capua, F.; Dong, T.  V.; Eidelman, S.; Epifanov, D.; Ferber, T.; Fulsom, B.  G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Giri, A.; Goldenzweig, P.; Grzymkowska, O.; Gudkova, K.; Hadjivasiliou, C.; Hartbrich, O.; Hayasaka, K.; Hayashii, H.; Hernandez Villanueva, M.; Hsu, C. -L.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W.  W.; Jia, S.; Jin, Y.; Joo, C.  W.; Joo, K.  K.; Kang, K.  H.; Karyan, G.; Kato, Y.; Kichimi, H.; Kim, C.  H.; Kim, D.  Y.; Kim, K. -H.; Kim, S.  H.; Kinoshita, K.; Kodyš, P.; Konno, T.; Korobov, A.; Korpar, S.; Kovalenko, E.; Križan, P.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kumar, M.; Kumar, R.; Kumara, K.; Kuzmin, A.; Kwon, Y. -J.; Lalwani, K.; Lange, J.  S.; Lee, I.  S.; Lee, S.  C.; Li, C.  H.; Li, L.  K.; Li Gioi, L.; Libby, J.; Lieret, K.; Liventsev, D.; Masuda, M.; Matvienko, D.; McNeil, J.  T.; Metzner, F.; Mizuk, R.; Mohanty, G.  B.; Moon, T.  J.; Mori, T.; Mussa, R.; Natochii, A.; Nayak, L.; Nayak, M.; Niiyama, M.; Nisar, N.  K.; Nishida, S.; Nishimura, K.; Ogawa, S.; Ono, H.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Pang, T.; Pardi, S.; Park, H.; Patra, S.; Paul, S.; Pedlar, T.  K.; Pestotnik, R.; Piilonen, L.  E.; Podobnik, T.; Popov, V.; Prencipe, E.; Prim, M.  T.; Röhrken, M.; Rostomyan, A.; Rout, N.; Russo, G.; Sahoo, D.; Sakai, Y.; Sandilya, S.; Santelj, L.; Sanuki, T.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Shapkin, M.; Sharma, C.; Shiu, J. -G.; Sokolov, A.; Solovieva, E.; Starič, M.; Stottler, Z.  S.; Sumihama, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Uchida, M.; Uehara, S.; Uglov, T.; Uno, K.; Uno, S.; Usov, Y.; Van Tonder, R.; Varner, G.; Vinokurova, A.; Vossen, A.; Wang, C.  H.; Wang, M. -Z.; Wang, P.; Wang, X.  L.; Watanabe, M.; Watanuki, S.; Won, E.; Xu, X.; Yan, W.; Yang, S.  B.; Ye, H.; Yin, J.  H.; Yuan, C.  Z.; Zhang, Z.  P.; Zhilich, V.; Zhukova, V.

Using data samples of 89.5 and 711 fb^-1 recorded at energies of √s = 10.52 and 10.58 GeV, respectively, with the Belle detector at the KEKB e⁺e^- collider, we report measurements of branching fractions of semileptonic decays Ξ$$^{0}_{c}$$ → Ξ-ℓ⁺ν_ℓ (ℓ = e or μ) and the CP-asymmetry parameter of Ξ$$^{0}_{c}$$ → Ξ-π⁺ decay. The branching fractions are measured to be B(Ξ$$^{0}_{c}$$ → Ξ-e⁺ν_e) =(1.31 ± 0.04 ± 0.07 ± 0.38)% and B(Ξ$$^{0}_{c}$$ → Ξ^-μ⁺ν_μ) = (1.27 ± 0.06 ± 0.10 ± 0.37)%, and the decay parameter α_Ξπ is measured to be 0.63 ± 0.03 ± 0.01 with much improved precision compared to the current world average. The corresponding ratio B(Ξ$$^{0}_{c}$$ → Ξ-e⁺ν_e)/B(Ξ$$^{0}_{c}$$ → Ξ^-μ⁺ν_μ) is 1.03 ± 0.05 ± 0.07, which is consistent with the expectation of lepton flavor universality.

• Research Organization: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE
• Contributing Organization: Belle Collaboration
• Grant/Contract Number: SC0009973; SC0012704
• OSTI ID: 1821029
• Alternate ID(s): OSTI ID: 1828885; OSTI ID: 1837921
• Report Number(s): BNL-222358-2021-JAAM; 2020TQ0079; 11575017; 11761141009; 11975076; 12042509; 12135005; 14.W03.31.0026; TRN: US2300933
• Journal Information: Physical Review Letters, Vol. 127, Issue 12; ISSN 0031-9007
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English