Measurements of the Branching Fractions of the Semileptonic Decays Ξ c 0 → Ξ − ℓ + ν ℓ and the Asymmetry Parameter of Ξ c 0 → Ξ − π +

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.

doi:10.1103/PhysRevLett.127.121803

Title: Measurements of the Branching Fractions of the Semileptonic Decays $Ξ_{c}^{0} \to Ξ^{-} ℓ^{+} ν_{ℓ}$ and the Asymmetry Parameter of $Ξ_{c}^{0} \to Ξ^{-} π^{+}$

Journal Article · Fri Sep 17 00:00:00 EDT 2021 · Physical Review Letters

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

Li, Y. B.;

; 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. more »

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Belle Collaboration

Grant/Contract Number:: SC0012704; SC0009973

OSTI ID:: 1821029

Alternate ID(s):: OSTI ID: 1828885; OSTI ID: 1837921

Report Number(s):: BNL-222358-2021-JAAM; PRLTAO; 121803

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 127 Journal Issue: 12; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Measurements of the Branching Fractions of the Semileptonic Decays Ξ c 0 → Ξ − ℓ + ν ℓ and the Asymmetry Parameter of Ξ c 0 → Ξ − π +

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Title: Measurements of the Branching Fractions of the Semileptonic Decays $Ξ_{c}^{0} \to Ξ^{-} ℓ^{+} ν_{ℓ}$ and the Asymmetry Parameter of $Ξ_{c}^{0} \to Ξ^{-} π^{+}$