Observation of Ξ c(2930) 0 and updated measurement of B-→K-Λc+Λ¯c- at Belle: Belle Collaboration

Y. B. Li; C. P. Shen; I. Adachi; J. K. Ahn; H. Aihara; S. Al Said; D. M. Asner; T. Aushev; R. Ayad; V. Babu; I. Badhrees; A. M. Bakich; Y. Ban; V. Bansal; P. Behera; M. Berger; V. Bhardwaj; B. Bhuyan; J. Biswal; G. Bonvicini; A. Bozek; M. Bračko; T. E. Browder; D. Červenkov; V. Chekelian; A. Chen; B. G. Cheon; K. Chilikin; K. Cho; S. K. Choi; Y. Choi; D. Cinabro; S. Cunliffe; N. Dash; S. Di Carlo; Z. Doležal; Z. Drásal; S. Eidelman; D. Epifanov; J. E. Fast; T. Ferber; B. G. Fulsom; R. Garg; V. Gaur; N. Gabyshev; A. Garmash; M. Gelb; A. Giri; P. Goldenzweig; E. Guido; J. Haba; T. Hara; K. Hayasaka; H. Hayashii; M. T. Hedges; W. S. Hou; T. Iijima; K. Inami; G. Inguglia; A. Ishikawa; R. Itoh; M. Iwasaki; Y. Iwasaki; W. W. Jacobs; S. Jia; Y. Jin; K. K. Joo; T. Julius; G. Karyan; Y. Kato; T. Kawasaki; H. Kichimi; C. Kiesling; D. Y. Kim; J. B. Kim; K. T. Kim; S. H. Kim; K. Kinoshita; P. Kodyš; S. Korpar; D. Kotchetkov; P. Križan; R. Kroeger; P. Krokovny; R. Kulasiri; T. Kumita; A. Kuzmin; Y. J. Kwon; I. S. Lee; S. C. Lee; L. K. Li; L. Li Gioi; J. Libby; D. Liventsev; M. Lubej; T. Luo; J. MacNaughton; M. Masuda; T. Matsuda; M. Merola; K. Miyabayashi; H. Miyata; R. Mizuk; G. B. Mohanty; H. K. Moon; T. Mori; M. Mrvar; R. Mussa; E. Nakano; M. Nakao; T. Nanut; K. J. Nath; Z. Natkaniec; M. Nayak; M. Niiyama; S. Nishida; S. Ogawa; P. Pakhlov; G. Pakhlova; B. Pal; S. Pardi; C. W. Park; H. Park; S. Paul; T. K. Pedlar; R. Pestotnik; L. E. Piilonen; V. Popov; A. Rostomyan; G. Russo; Y. Sakai; M. Salehi; S. Sandilya; L. Santelj; T. Sanuki; O. Schneider; G. Schnell; C. Schwanda; Y. Seino; V. Shebalin; T. A. Shibata; J. G. Shiu; B. Shwartz; A. Sokolov; E. Solovieva; M. Starič; J. F. Strube; M. Sumihama; T. Sumiyoshi; M. Takizawa; U. Tamponi; K. Tanida; F. Tenchini; M. Uchida; T. Uglov; Y. Unno; S. Uno; C. Van Hulse; G. Varner; V. Vorobyev; A. Vossen; E. Waheed; B. Wang; C. H. Wang; M. Z. Wang; P. Wang; X. L. Wang; M. Watanabe; Y. Watanabe; E. Widmann; E. Won; H. Ye; J. Yelton; C. Z. Yuan; Y. Yusa; S. Zakharov; Z. P. Zhang; V. Zhilich; V. Zhukova; V. Zhulanov

doi:10.1140/epjc/s10052-018-5720-5

Observation of Ξ _c(2930) ⁰ and updated measurement of ^B-→^K-Λc+Λ¯c- at Belle: Belle Collaboration

Y. B. Li, C. P. Shen^*, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, Y. Ban, V. Bansal, P. Behera, M. Berger, V. Bhardwaj, B. Bhuyan, J. Biswal, G. BonviciniA. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, E. Guido, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, W. S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, K. K. Joo, T. Julius, G. Karyan, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, R. Kulasiri, T. Kumita, A. Kuzmin, Y. J. Kwon, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, M. Mrvar, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, S. Nishida, S. Ogawa, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, C. W. Park, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, C. Van Hulse, G. Varner, V. Vorobyev, A. Vossen, E. Waheed, B. Wang, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, E. Widmann, E. Won, H. Ye, J. Yelton, C. Z. Yuan, Y. Yusa, S. Zakharov, Z. P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov

^*Corresponding author for this work

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

Abstract

We report the first observation of the Ξ _c(2930) ⁰ charmed-strange baryon with a significance greater than 5σ. The Ξ _c(2930) ⁰ is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c² and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Y_η, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772 ± 11) × 10 ⁶BB¯ pairs collected at the Υ (4 S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.

Original language	English
Article number	252
Journal	European Physical Journal C
Volume	78
Issue number	3
DOIs	https://doi.org/10.1140/epjc/s10052-018-5720-5
State	Published - 1 Mar 2018
Externally published	Yes

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10.1140/epjc/s10052-018-5720-5

Cite this

Li, Y. B., Shen, C. P., Adachi, I., Ahn, J. K., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Ban, Y., Bansal, V., Behera, P., Berger, M., Bhardwaj, V., Bhuyan, B., Biswal, J., ... Zhulanov, V. (2018). Observation of Ξ _c(2930) ⁰ and updated measurement of ^B-→^K-Λc+Λ¯c- at Belle: Belle Collaboration. European Physical Journal C, 78(3), Article 252. https://doi.org/10.1140/epjc/s10052-018-5720-5

@article{3be958462e0f47e7956d6d2c329bb6b3,

title = "Observation of Ξ c(2930) 0 and updated measurement of B-→K-Λc+Λ¯c- at Belle: Belle Collaboration",

abstract = "We report the first observation of the Ξ c(2930) 0 charmed-strange baryon with a significance greater than 5σ. The Ξ c(2930) 0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c2 and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Yη, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772 ± 11) × 10 6BB¯ pairs collected at the Υ (4 S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.",

author = "Li, {Y. B.} and Shen, {C. P.} and I. Adachi and Ahn, {J. K.} and H. Aihara and {Al Said}, S. and Asner, {D. M.} and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, {A. M.} and Y. Ban and V. Bansal and P. Behera and M. Berger and V. Bhardwaj and B. Bhuyan and J. Biswal and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and D. {\v C}ervenkov and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and K. Cho and Choi, {S. K.} and Y. Choi and D. Cinabro and S. Cunliffe and N. Dash and {Di Carlo}, S. and Z. Dole{\v z}al and Z. Dr{\'a}sal and S. Eidelman and D. Epifanov and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and R. Garg and V. Gaur and N. Gabyshev and A. Garmash and M. Gelb and A. Giri and P. Goldenzweig and E. Guido and J. Haba and T. Hara and K. Hayasaka and H. Hayashii and Hedges, {M. T.} and Hou, {W. S.} and T. Iijima and K. Inami and G. Inguglia and A. Ishikawa and R. Itoh and M. Iwasaki and Y. Iwasaki and Jacobs, {W. W.} and S. Jia and Y. Jin and Joo, {K. K.} and T. Julius and G. Karyan and Y. Kato and T. Kawasaki and H. Kichimi and C. Kiesling and Kim, {D. Y.} and Kim, {J. B.} and Kim, {K. T.} and Kim, {S. H.} and K. Kinoshita and P. Kody{\v s} and S. Korpar and D. Kotchetkov and P. Kri{\v z}an and R. Kroeger and P. Krokovny and R. Kulasiri and T. Kumita and A. Kuzmin and Kwon, {Y. J.} and Lee, {I. S.} and Lee, {S. C.} and Li, {L. K.} and {Li Gioi}, L. and J. Libby and D. Liventsev and M. Lubej and T. Luo and J. MacNaughton and M. Masuda and T. Matsuda and M. Merola and K. Miyabayashi and H. Miyata and R. Mizuk and Mohanty, {G. B.} and Moon, {H. K.} and T. Mori and M. Mrvar and R. Mussa and E. Nakano and M. Nakao and T. Nanut and Nath, {K. J.} and Z. Natkaniec and M. Nayak and M. Niiyama and S. Nishida and S. Ogawa and P. Pakhlov and G. Pakhlova and B. Pal and S. Pardi and Park, {C. W.} and H. Park and S. Paul and Pedlar, {T. K.} and R. Pestotnik and Piilonen, {L. E.} and V. Popov and A. Rostomyan and G. Russo and Y. Sakai and M. Salehi and S. Sandilya and L. Santelj and T. Sanuki and O. Schneider and G. Schnell and C. Schwanda and Y. Seino and V. Shebalin and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and A. Sokolov and E. Solovieva and M. Stari{\v c} and Strube, {J. F.} and M. Sumihama and T. Sumiyoshi and M. Takizawa and U. Tamponi and K. Tanida and F. Tenchini and M. Uchida and T. Uglov and Y. Unno and S. Uno and {Van Hulse}, C. and G. Varner and V. Vorobyev and A. Vossen and E. Waheed and B. Wang and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Wang, {X. L.} and M. Watanabe and Y. Watanabe and E. Widmann and E. Won and H. Ye and J. Yelton and Yuan, {C. Z.} and Y. Yusa and S. Zakharov and Zhang, {Z. P.} and V. Zhilich and V. Zhukova and V. Zhulanov",

note = "Publisher Copyright: {\textcopyright} 2018, The Author(s).",

year = "2018",

month = mar,

day = "1",

doi = "10.1140/epjc/s10052-018-5720-5",

language = "אנגלית",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "3",

}

Li, YB, Shen, CP, Adachi, I, Ahn, JK, Aihara, H, Al Said, S, Asner, DM, Aushev, T, Ayad, R, Babu, V, Badhrees, I, Bakich, AM, Ban, Y, Bansal, V, Behera, P, Berger, M, Bhardwaj, V, Bhuyan, B, Biswal, J, Bonvicini, G, Bozek, A, Bračko, M, Browder, TE, Červenkov, D, Chekelian, V, Chen, A, Cheon, BG, Chilikin, K, Cho, K, Choi, SK, Choi, Y, Cinabro, D, Cunliffe, S, Dash, N, Di Carlo, S, Doležal, Z, Drásal, Z, Eidelman, S, Epifanov, D, Fast, JE, Ferber, T, Fulsom, BG, Garg, R, Gaur, V, Gabyshev, N, Garmash, A, Gelb, M, Giri, A, Goldenzweig, P, Guido, E, Haba, J, Hara, T, Hayasaka, K, Hayashii, H, Hedges, MT, Hou, WS, Iijima, T, Inami, K, Inguglia, G, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Jacobs, WW, Jia, S, Jin, Y, Joo, KK, Julius, T, Karyan, G, Kato, Y, Kawasaki, T, Kichimi, H, Kiesling, C, Kim, DY, Kim, JB, Kim, KT, Kim, SH, Kinoshita, K, Kodyš, P, Korpar, S, Kotchetkov, D, Križan, P, Kroeger, R, Krokovny, P, Kulasiri, R, Kumita, T, Kuzmin, A, Kwon, YJ, Lee, IS, Lee, SC, Li, LK, Li Gioi, L, Libby, J, Liventsev, D, Lubej, M, Luo, T, MacNaughton, J, Masuda, M, Matsuda, T, Merola, M, Miyabayashi, K, Miyata, H, Mizuk, R, Mohanty, GB, Moon, HK, Mori, T, Mrvar, M, Mussa, R, Nakano, E, Nakao, M, Nanut, T, Nath, KJ, Natkaniec, Z, Nayak, M, Niiyama, M, Nishida, S, Ogawa, S, Pakhlov, P, Pakhlova, G, Pal, B, Pardi, S, Park, CW, Park, H, Paul, S, Pedlar, TK, Pestotnik, R, Piilonen, LE, Popov, V, Rostomyan, A, Russo, G, Sakai, Y, Salehi, M, Sandilya, S, Santelj, L, Sanuki, T, Schneider, O, Schnell, G, Schwanda, C, Seino, Y, Shebalin, V, Shibata, TA, Shiu, JG, Shwartz, B, Sokolov, A, Solovieva, E, Starič, M, Strube, JF, Sumihama, M, Sumiyoshi, T, Takizawa, M, Tamponi, U, Tanida, K, Tenchini, F, Uchida, M, Uglov, T, Unno, Y, Uno, S, Van Hulse, C, Varner, G, Vorobyev, V, Vossen, A, Waheed, E, Wang, B, Wang, CH, Wang, MZ, Wang, P, Wang, XL, Watanabe, M, Watanabe, Y, Widmann, E, Won, E, Ye, H, Yelton, J, Yuan, CZ, Yusa, Y, Zakharov, S, Zhang, ZP, Zhilich, V, Zhukova, V & Zhulanov, V 2018, 'Observation of Ξ _c(2930) ⁰ and updated measurement of ^B-→^K-Λc+Λ¯c- at Belle: Belle Collaboration', European Physical Journal C, vol. 78, no. 3, 252. https://doi.org/10.1140/epjc/s10052-018-5720-5

TY - JOUR

T1 - Observation of Ξ c(2930) 0 and updated measurement of B-→K-Λc+Λ¯c- at Belle

T2 - Belle Collaboration

AU - Li, Y. B.

AU - Shen, C. P.

AU - Adachi, I.

AU - Ahn, J. K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Ban, Y.

AU - Bansal, V.

AU - Behera, P.

AU - Berger, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, S. K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Dash, N.

AU - Di Carlo, S.

AU - Doležal, Z.

AU - Drásal, Z.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Garg, R.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gelb, M.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Guido, E.

AU - Haba, J.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hedges, M. T.

AU - Hou, W. S.

AU - Iijima, T.

AU - Inami, K.

AU - Inguglia, G.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Jacobs, W. W.

AU - Jia, S.

AU - Jin, Y.

AU - Joo, K. K.

AU - Julius, T.

AU - Karyan, G.

AU - Kato, Y.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kiesling, C.

AU - Kim, D. Y.

AU - Kim, J. B.

AU - Kim, K. T.

AU - Kim, S. H.

AU - Kinoshita, K.

AU - Kodyš, P.

AU - Korpar, S.

AU - Kotchetkov, D.

AU - Križan, P.

AU - Kroeger, R.

AU - Krokovny, P.

AU - Kulasiri, R.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lee, I. S.

AU - Lee, S. C.

AU - Li, L. K.

AU - Li Gioi, L.

AU - Libby, J.

AU - Liventsev, D.

AU - Lubej, M.

AU - Luo, T.

AU - MacNaughton, J.

AU - Masuda, M.

AU - Matsuda, T.

AU - Merola, M.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Moon, H. K.

AU - Mori, T.

AU - Mrvar, M.

AU - Mussa, R.

AU - Nakano, E.

AU - Nakao, M.

AU - Nanut, T.

AU - Nath, K. J.

AU - Natkaniec, Z.

AU - Nayak, M.

AU - Niiyama, M.

AU - Nishida, S.

AU - Ogawa, S.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Pal, B.

AU - Pardi, S.

AU - Park, C. W.

AU - Park, H.

AU - Paul, S.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Popov, V.

AU - Rostomyan, A.

AU - Russo, G.

AU - Sakai, Y.

AU - Salehi, M.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Schneider, O.

AU - Schnell, G.

AU - Schwanda, C.

AU - Seino, Y.

AU - Shebalin, V.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Strube, J. F.

AU - Sumihama, M.

AU - Sumiyoshi, T.

AU - Takizawa, M.

AU - Tamponi, U.

AU - Tanida, K.

AU - Tenchini, F.

AU - Uchida, M.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Van Hulse, C.

AU - Varner, G.

AU - Vorobyev, V.

AU - Vossen, A.

AU - Waheed, E.

AU - Wang, B.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, M.

AU - Watanabe, Y.

AU - Widmann, E.

AU - Won, E.

AU - Ye, H.

AU - Yelton, J.

AU - Yuan, C. Z.

AU - Yusa, Y.

AU - Zakharov, S.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhukova, V.

AU - Zhulanov, V.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - We report the first observation of the Ξ c(2930) 0 charmed-strange baryon with a significance greater than 5σ. The Ξ c(2930) 0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c2 and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Yη, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772 ± 11) × 10 6BB¯ pairs collected at the Υ (4 S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.

AB - We report the first observation of the Ξ c(2930) 0 charmed-strange baryon with a significance greater than 5σ. The Ξ c(2930) 0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c2 and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Yη, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772 ± 11) × 10 6BB¯ pairs collected at the Υ (4 S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.

UR - http://www.scopus.com/inward/record.url?scp=85044472530&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-018-5720-5

DO - 10.1140/epjc/s10052-018-5720-5

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AN - SCOPUS:85044472530

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 3

M1 - 252

ER -

Observation of Ξ _c(2930) ⁰ and updated measurement of ^B-→^K-Λc+Λ¯c- at Belle: Belle Collaboration

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