Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+

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

doi:10.1103/PhysRevLett.127.121803

Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

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 Ξc0→Ξ-ℓ+νℓ (ℓ=e or μ) and the CP-asymmetry parameter of Ξc0→Ξ-π+ decay. The branching fractions are measured to be B(Ξc0→Ξ-e+νe)=(1.31±0.04±0.07±0.38)% and B(Ξc0→Ξ-μ+νμ)=(1.27±0.06±0.10±0.37)%, and the decay parameter αΞπ is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξc0→Ξ-e+νe)/B(Ξc0→Ξ-μ+νμ) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter ACP=(αΞ-π++αΞ¯+π-)/(αΞ-π+-αΞ¯+π-)=0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξc0→Ξ-π+ branching fraction.

Original language	English
Article number	121803
Journal	Physical review letters
Volume	127
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.127.121803
Publication status	Published - 2021 Sept 17

Bibliographical note

Publisher Copyright:
© 2021 authors. Published by the American Physical Society.

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1103/PhysRevLett.127.121803

Cite this

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., ... Zhukova, V. (2021). Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+. Physical review letters, 127(12), Article 121803. https://doi.org/10.1103/PhysRevLett.127.121803

Li, YB, Shen, CP, Adachi, I, Adamczyk, K, Aihara, H, Al Said, S, Asner, DM, 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, TE, Campajola, M, Červenkov, D, Chang, MC, Chen, A, Cheon, BG, Chilikin, K, Cho, K, Cho, SJ, Choi, SK, Choi, Y, Choudhury, S, Cinabro, D, Cunliffe, S, Das, S, Dash, N, De Nardo, G, Dhamija, R, Di Capua, F, Dong, TV, Eidelman, S, Epifanov, D, Ferber, T, Fulsom, BG, 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, CL, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Jacobs, WW, Jia, S, Jin, Y, Joo, CW, Joo, KK, Kang, KH, Karyan, G, Kato, Y, Kichimi, H, Kim, CH, Kim, DY, Kim, KH, Kim, SH, 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, YJ, Lalwani, K, Lange, JS, Lee, IS, Lee, SC, Li, CH, Li, LK, Li Gioi, L, Libby, J, Lieret, K, Liventsev, D, Masuda, M, Matvienko, D, McNeil, JT, Metzner, F, Mizuk, R, Mohanty, GB, Moon, TJ, Mori, T, Mussa, R, Natochii, A, Nayak, L, Nayak, M, Niiyama, M, Nisar, NK, 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, TK, Pestotnik, R, Piilonen, LE, Podobnik, T, Popov, V, Prencipe, E, Prim, MT, 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, JG, Sokolov, A, Solovieva, E, Starič, M, Stottler, ZS, 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, CH, Wang, MZ, Wang, P, Wang, XL, Watanabe, M, Watanuki, S, Won, E, Xu, X, Yan, W, Yang, SB, Ye, H, Yin, JH, Yuan, CZ, Zhang, ZP, Zhilich, V & Zhukova, V 2021, 'Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+', Physical review letters, vol. 127, no. 12, 121803. https://doi.org/10.1103/PhysRevLett.127.121803

@article{343fa7e6744a4d14848c33ed43f785a1,

title = "Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+",

abstract = "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 Ξc0→Ξ-ℓ+νℓ (ℓ=e or μ) and the CP-asymmetry parameter of Ξc0→Ξ-π+ decay. The branching fractions are measured to be B(Ξc0→Ξ-e+νe)=(1.31±0.04±0.07±0.38)% and B(Ξc0→Ξ-μ+νμ)=(1.27±0.06±0.10±0.37)%, and the decay parameter αΞπ is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξc0→Ξ-e+νe)/B(Ξc0→Ξ-μ+νμ) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter ACP=(αΞ-π++αΞ¯+π-)/(αΞ-π+-αΞ¯+π-)=0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξc0→Ξ-π+ branching fraction.",

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

note = "Publisher Copyright: {\textcopyright} 2021 authors. Published by the American Physical Society.",

year = "2021",

month = sep,

day = "17",

doi = "10.1103/PhysRevLett.127.121803",

language = "English",

volume = "127",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "12",

}

TY - JOUR

T1 - Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+

AU - Li, Y. B.

AU - Shen, C. P.

AU - Adachi, I.

AU - Adamczyk, K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Behera, P.

AU - Bennett, J.

AU - Bessner, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswal, J.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Campajola, M.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Cho, S. J.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Das, S.

AU - Dash, N.

AU - De Nardo, G.

AU - Dhamija, R.

AU - Di Capua, F.

AU - Dong, T. V.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Garg, R.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Grzymkowska, O.

AU - Gudkova, K.

AU - Hadjivasiliou, C.

AU - Hartbrich, O.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hernandez Villanueva, M.

AU - Hsu, C. L.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Jacobs, W. W.

AU - Jia, S.

AU - Jin, Y.

AU - Joo, C. W.

AU - Joo, K. K.

AU - Kang, K. H.

AU - Karyan, G.

AU - Kato, Y.

AU - Kichimi, H.

AU - Kim, C. H.

AU - Kim, D. Y.

AU - Kim, K. H.

AU - Kim, S. H.

AU - Kinoshita, K.

AU - Kodyš, P.

AU - Konno, T.

AU - Korobov, A.

AU - Korpar, S.

AU - Kovalenko, E.

AU - KriŽan, P.

AU - Kroeger, R.

AU - Krokovny, P.

AU - Kuhr, T.

AU - Kumar, M.

AU - Kumar, R.

AU - Kumara, K.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lalwani, K.

AU - Lange, J. S.

AU - Lee, I. S.

AU - Lee, S. C.

AU - Li, C. H.

AU - Li, L. K.

AU - Li Gioi, L.

AU - Libby, J.

AU - Lieret, K.

AU - Liventsev, D.

AU - Masuda, M.

AU - Matvienko, D.

AU - McNeil, J. T.

AU - Metzner, F.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Moon, T. J.

AU - Mori, T.

AU - Mussa, R.

AU - Natochii, A.

AU - Nayak, L.

AU - Nayak, M.

AU - Niiyama, M.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Nishimura, K.

AU - Ogawa, S.

AU - Ono, H.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Pang, T.

AU - Pardi, S.

AU - Park, H.

AU - Patra, S.

AU - Paul, S.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Podobnik, T.

AU - Popov, V.

AU - Prencipe, E.

AU - Prim, M. T.

AU - Röhrken, M.

AU - Rostomyan, A.

AU - Rout, N.

AU - Russo, G.

AU - Sahoo, D.

AU - Sakai, Y.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Savinov, V.

AU - Schnell, G.

AU - Schwanda, C.

AU - Seino, Y.

AU - Senyo, K.

AU - Shapkin, M.

AU - Sharma, C.

AU - Shiu, J. G.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Stottler, Z. S.

AU - Sumihama, M.

AU - Tamponi, U.

AU - Tanida, K.

AU - Tenchini, F.

AU - Uchida, M.

AU - Uehara, S.

AU - Uglov, T.

AU - Uno, K.

AU - Uno, S.

AU - Usov, Y.

AU - Van Tonder, R.

AU - Varner, G.

AU - Vinokurova, A.

AU - Vossen, A.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, M.

AU - Watanuki, S.

AU - Won, E.

AU - Xu, X.

AU - Yan, W.

AU - Yang, S. B.

AU - Ye, H.

AU - Yin, J. H.

AU - Yuan, C. Z.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhukova, V.

PY - 2021/9/17

Y1 - 2021/9/17

N2 - 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 Ξc0→Ξ-ℓ+νℓ (ℓ=e or μ) and the CP-asymmetry parameter of Ξc0→Ξ-π+ decay. The branching fractions are measured to be B(Ξc0→Ξ-e+νe)=(1.31±0.04±0.07±0.38)% and B(Ξc0→Ξ-μ+νμ)=(1.27±0.06±0.10±0.37)%, and the decay parameter αΞπ is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξc0→Ξ-e+νe)/B(Ξc0→Ξ-μ+νμ) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter ACP=(αΞ-π++αΞ¯+π-)/(αΞ-π+-αΞ¯+π-)=0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξc0→Ξ-π+ branching fraction.

AB - 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 Ξc0→Ξ-ℓ+νℓ (ℓ=e or μ) and the CP-asymmetry parameter of Ξc0→Ξ-π+ decay. The branching fractions are measured to be B(Ξc0→Ξ-e+νe)=(1.31±0.04±0.07±0.38)% and B(Ξc0→Ξ-μ+νμ)=(1.27±0.06±0.10±0.37)%, and the decay parameter αΞπ is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξc0→Ξ-e+νe)/B(Ξc0→Ξ-μ+νμ) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter ACP=(αΞ-π++αΞ¯+π-)/(αΞ-π+-αΞ¯+π-)=0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξc0→Ξ-π+ branching fraction.

UR - http://www.scopus.com/inward/record.url?scp=85116147496&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.127.121803

DO - 10.1103/PhysRevLett.127.121803

M3 - Article

C2 - 34597085

AN - SCOPUS:85116147496

SN - 0031-9007

VL - 127

JO - Physical review letters

JF - Physical review letters

IS - 12

M1 - 121803

ER -

Measurements of the Branching Fractions of the Semileptonic Decays Ξc0 → Ξ-ℓ+νℓ and the Asymmetry Parameter of Ξc0 → Ξ-π+

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