Evidence of a structure in K¯0Λc+ consistent with a charged Ξ c(2930) + , and updated measurement of B¯0→K¯0Λc+Λ¯c- at Belle: Belle Collaboration

Y. B. Li; C. P. Shen; I. Adachi; H. Aihara; S. Al Said; D. M. Asner; T. Aushev; R. Ayad; V. Babu; I. Badhrees; S. Bahinipati; Y. Ban; V. Bansal; P. Behera; C. Beleño; V. Bhardwaj; B. Bhuyan; J. Biswal; A. Bobrov; A. Bozek; M. Bračko; T. E. Browder; L. Cao; D. Červenkov; P. Chang; V. Chekelian; A. Chen; B. G. Cheon; K. Chilikin; K. Cho; S. K. Choi; Y. Choi; S. Choudhury; D. Cinabro; S. Cunliffe; N. Dash; S. Di Carlo; J. Dingfelder; Z. Doležal; T. V. Dong; Z. Drásal; S. Eidelman; D. Epifanov; J. E. Fast; B. G. Fulsom; R. Garg; V. Gaur; N. Gabyshev; A. Garmash; M. Gelb; A. Giri; P. Goldenzweig; B. Golob; J. Haba; K. Hayasaka; S. Hirose; W. S. Hou; T. Iijima; K. Inami; G. Inguglia; A. Ishikawa; R. Itoh; M. Iwasaki; Y. Iwasaki; W. W. Jacobs; I. Jaegle; H. B. Jeon; S. Jia; Y. Jin; K. K. Joo; A. B. Kaliyar; K. H. Kang; Y. Kato; T. Kawasaki; D. Y. Kim; J. B. Kim; S. H. Kim; K. Kinoshita; P. Kodyš; S. Korpar; D. Kotchetkov; P. Križan; R. Kroeger; P. Krokovny; T. Kuhr; Y. J. Kwon; J. S. Lange; I. S. Lee; S. C. Lee; L. K. Li; L. Li Gioi; J. Libby; D. Liventsev; T. Luo; D. Matvienko; M. Merola; H. Miyata; R. Mizuk; H. K. Moon; T. Mori; R. Mussa; E. Nakano; T. Nanut; K. J. Nath; Z. Natkaniec; M. Nayak; N. K. Nisar; S. Nishida; K. Nishimura; K. Ogawa; S. Okuno; H. Ono; P. Pakhlov; G. Pakhlova; B. Pal; S. Pardi; H. Park; S. Paul; T. K. Pedlar; R. Pestotnik; L. E. Piilonen; V. Popov; E. Prencipe; A. Rostomyan; G. Russo; Y. Sakai; M. Salehi; S. Sandilya; L. Santelj; T. Sanuki; V. Savinov; O. Schneider; G. Schnell; C. Schwanda; Y. Seino; K. Senyo; O. Seon; M. E. Sevior; T. A. Shibata; J. G. Shiu; 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; Y. Usov; C. Van Hulse; R. Van Tonder; G. Varner; K. E. Varvell; V. Vorobyev; E. Waheed; B. Wang; C. H. Wang; M. Z. Wang; P. Wang; X. L. Wang; S. Watanuki; E. Widmann; E. Won; H. Ye; J. Yelton; J. H. Yin; C. Z. Yuan; Y. Yusa; Z. P. Zhang; V. Zhilich; V. Zhukova; V. Zhulanov

doi:10.1140/epjc/s10052-018-6425-5

Evidence of a structure in ^K¯0Λc+ consistent with a charged Ξ _c(2930) ⁺ , and updated measurement of ^B¯0→^K¯0Λc+Λ¯c- at Belle: Belle Collaboration

Y. B. Li, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, Y. Ban, V. Bansal, P. Behera, C. Beleño, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, A. BozekM. Bračko, T. E. Browder, L. Cao, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, J. Dingfelder, Z. Doležal, T. V. Dong, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, B. Golob, J. Haba, K. Hayasaka, S. Hirose, W. S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, K. H. Kang, Y. Kato, T. Kawasaki, D. Y. Kim, J. B. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, Y. J. Kwon, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, H. K. Moon, T. Mori, R. Mussa, E. Nakano, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Okuno, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, T. A. Shibata, J. G. Shiu, 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, Y. Usov, C. Van Hulse, R. Van Tonder, G. Varner, K. E. Varvell, V. Vorobyev, E. Waheed, B. Wang, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, S. Watanuki, E. Widmann, E. Won, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov

Department of Physics

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

15 Citations (Scopus)

Abstract

We report evidence for the charged charmed-strange baryon Ξ _c(2930) ⁺ with a signal significance of 3.9σ with systematic errors included. The charged Ξ _c(2930) ⁺ is found in its decay to KS0Λc+ in the substructure of B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are [2942.3 ± 4.4 (stat.) ± 1.5 (syst.)] MeV/c² and [14.8 ± 8.8 (stat.) ± 2.5 (syst.)] MeV, respectively, and the product branching fraction is B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4. We also measure B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a 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) or Y_η 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	928
Journal	European Physical Journal C
Volume	78
Issue number	11
DOIs	https://doi.org/10.1140/epjc/s10052-018-6425-5
Publication status	Published - 2018 Nov 1

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

Access to Document

10.1140/epjc/s10052-018-6425-5

Cite this

Li, Y. B., Shen, C. P., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bahinipati, S., Ban, Y., Bansal, V., Behera, P., Beleño, C., Bhardwaj, V., Bhuyan, B., Biswal, J., Bobrov, A., ... Zhulanov, V. (2018). Evidence of a structure in ^K¯0Λc+ consistent with a charged Ξ _c(2930) ⁺ , and updated measurement of ^B¯0→^K¯0Λc+Λ¯c- at Belle: Belle Collaboration. European Physical Journal C, 78(11), [928]. https://doi.org/10.1140/epjc/s10052-018-6425-5

Li, YB, Shen, CP, Adachi, I, Aihara, H, Al Said, S, Asner, DM, Aushev, T, Ayad, R, Babu, V, Badhrees, I, Bahinipati, S, Ban, Y, Bansal, V, Behera, P, Beleño, C, Bhardwaj, V, Bhuyan, B, Biswal, J, Bobrov, A, Bozek, A, Bračko, M, Browder, TE, Cao, L, Červenkov, D, Chang, P, Chekelian, V, Chen, A, Cheon, BG, Chilikin, K, Cho, K, Choi, SK, Choi, Y, Choudhury, S, Cinabro, D, Cunliffe, S, Dash, N, Di Carlo, S, Dingfelder, J, Doležal, Z, Dong, TV, Drásal, Z, Eidelman, S, Epifanov, D, Fast, JE, Fulsom, BG, Garg, R, Gaur, V, Gabyshev, N, Garmash, A, Gelb, M, Giri, A, Goldenzweig, P, Golob, B, Haba, J, Hayasaka, K, Hirose, S, Hou, WS, Iijima, T, Inami, K, Inguglia, G, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Jacobs, WW, Jaegle, I, Jeon, HB, Jia, S, Jin, Y, Joo, KK, Kaliyar, AB, Kang, KH, Kato, Y, Kawasaki, T, Kim, DY, Kim, JB, Kim, SH, Kinoshita, K, Kodyš, P, Korpar, S, Kotchetkov, D, Križan, P, Kroeger, R, Krokovny, P, Kuhr, T, Kwon, YJ, Lange, JS, Lee, IS, Lee, SC, Li, LK, Li Gioi, L, Libby, J, Liventsev, D, Luo, T, Matvienko, D, Merola, M, Miyata, H, Mizuk, R, Moon, HK, Mori, T, Mussa, R, Nakano, E, Nanut, T, Nath, KJ, Natkaniec, Z, Nayak, M, Nisar, NK, Nishida, S, Nishimura, K, Ogawa, K, Okuno, S, Ono, H, Pakhlov, P, Pakhlova, G, Pal, B, Pardi, S, Park, H, Paul, S, Pedlar, TK, Pestotnik, R, Piilonen, LE, Popov, V, Prencipe, E, Rostomyan, A, Russo, G, Sakai, Y, Salehi, M, Sandilya, S, Santelj, L, Sanuki, T, Savinov, V, Schneider, O, Schnell, G, Schwanda, C, Seino, Y, Senyo, K, Seon, O, Sevior, ME, Shibata, TA, Shiu, JG, 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, Usov, Y, Van Hulse, C, Van Tonder, R, Varner, G, Varvell, KE, Vorobyev, V, Waheed, E, Wang, B, Wang, CH, Wang, MZ, Wang, P, Wang, XL, Watanuki, S, Widmann, E, Won, E, Ye, H, Yelton, J, Yin, JH, Yuan, CZ, Yusa, Y, Zhang, ZP, Zhilich, V, Zhukova, V & Zhulanov, V 2018, 'Evidence of a structure in ^K¯0Λc+ consistent with a charged Ξ _c(2930) ⁺ , and updated measurement of ^B¯0→^K¯0Λc+Λ¯c- at Belle: Belle Collaboration', European Physical Journal C, vol. 78, no. 11, 928. https://doi.org/10.1140/epjc/s10052-018-6425-5

@article{88e62f2efa994c3481ff601218ea461a,

title = "Evidence of a structure in K¯0Λc+ consistent with a charged Ξ c(2930) + , and updated measurement of B¯0→K¯0Λc+Λ¯c- at Belle: Belle Collaboration",

abstract = "We report evidence for the charged charmed-strange baryon Ξ c(2930) + with a signal significance of 3.9σ with systematic errors included. The charged Ξ c(2930) + is found in its decay to KS0Λc+ in the substructure of B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are [2942.3 ± 4.4 (stat.) ± 1.5 (syst.)] MeV/c2 and [14.8 ± 8.8 (stat.) ± 2.5 (syst.)] MeV, respectively, and the product branching fraction is B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4. We also measure B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a 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) or Yη 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 H. Aihara and {Al Said}, S. and Asner, {D. M.} and T. Aushev and R. Ayad and V. Babu and I. Badhrees and S. Bahinipati and Y. Ban and V. Bansal and P. Behera and C. Bele{\~n}o and V. Bhardwaj and B. Bhuyan and J. Biswal and A. Bobrov and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and L. Cao and D. {\v C}ervenkov and P. Chang and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and K. Cho and Choi, {S. K.} and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and N. Dash and {Di Carlo}, S. and J. Dingfelder and Z. Dole{\v z}al and Dong, {T. V.} and Z. Dr{\'a}sal and S. Eidelman and D. Epifanov and Fast, {J. E.} 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 B. Golob and J. Haba and K. Hayasaka and S. Hirose 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 I. Jaegle and Jeon, {H. B.} and S. Jia and Y. Jin and Joo, {K. K.} and Kaliyar, {A. B.} and Kang, {K. H.} and Y. Kato and T. Kawasaki and Kim, {D. Y.} and Kim, {J. B.} 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 T. Kuhr and Kwon, {Y. J.} and Lange, {J. S.} and Lee, {I. S.} and Lee, {S. C.} and Li, {L. K.} and {Li Gioi}, L. and J. Libby and D. Liventsev and T. Luo and D. Matvienko and M. Merola and H. Miyata and R. Mizuk and Moon, {H. K.} and T. Mori and R. Mussa and E. Nakano and T. Nanut and Nath, {K. J.} and Z. Natkaniec and M. Nayak and Nisar, {N. K.} and S. Nishida and K. Nishimura and K. Ogawa and S. Okuno and H. Ono and P. Pakhlov and G. Pakhlova and B. Pal and S. Pardi and H. Park and S. Paul and Pedlar, {T. K.} and R. Pestotnik and Piilonen, {L. E.} and V. Popov and E. Prencipe and A. Rostomyan and G. Russo and Y. Sakai and M. Salehi and S. Sandilya and L. Santelj and T. Sanuki and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and Y. Seino and K. Senyo and O. Seon and Sevior, {M. E.} and Shibata, {T. A.} and Shiu, {J. G.} 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 Y. Usov and {Van Hulse}, C. and {Van Tonder}, R. and G. Varner and Varvell, {K. E.} and V. Vorobyev and E. Waheed and B. Wang and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Wang, {X. L.} and S. Watanuki and E. Widmann and E. Won and H. Ye and J. Yelton and Yin, {J. H.} and Yuan, {C. Z.} and Y. Yusa and Zhang, {Z. P.} and V. Zhilich and V. Zhukova and V. Zhulanov",

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

year = "2018",

month = nov,

day = "1",

doi = "10.1140/epjc/s10052-018-6425-5",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "11",

}

TY - JOUR

T1 - Evidence of a structure in K¯0Λc+ consistent with a charged Ξ c(2930) + , and updated measurement of B¯0→K¯0Λc+Λ¯c- at Belle

T2 - Belle Collaboration

AU - Li, Y. B.

AU - Shen, C. P.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bahinipati, S.

AU - Ban, Y.

AU - Bansal, V.

AU - Behera, P.

AU - Beleño, C.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bobrov, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Cao, L.

AU - Červenkov, D.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Dash, N.

AU - Di Carlo, S.

AU - Dingfelder, J.

AU - Doležal, Z.

AU - Dong, T. V.

AU - Drásal, Z.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

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 - Golob, B.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hirose, S.

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 - Jaegle, I.

AU - Jeon, H. B.

AU - Jia, S.

AU - Jin, Y.

AU - Joo, K. K.

AU - Kaliyar, A. B.

AU - Kang, K. H.

AU - Kato, Y.

AU - Kawasaki, T.

AU - Kim, D. Y.

AU - Kim, J. B.

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 - Kuhr, T.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Lee, I. S.

AU - Lee, S. C.

AU - Li, L. K.

AU - Li Gioi, L.

AU - Libby, J.

AU - Liventsev, D.

AU - Luo, T.

AU - Matvienko, D.

AU - Merola, M.

AU - Miyata, H.

AU - Mizuk, R.

AU - Moon, H. K.

AU - Mori, T.

AU - Mussa, R.

AU - Nakano, E.

AU - Nanut, T.

AU - Nath, K. J.

AU - Natkaniec, Z.

AU - Nayak, M.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Nishimura, K.

AU - Ogawa, K.

AU - Okuno, S.

AU - Ono, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Pal, B.

AU - Pardi, S.

AU - Park, H.

AU - Paul, S.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Popov, V.

AU - Prencipe, E.

AU - Rostomyan, A.

AU - Russo, G.

AU - Sakai, Y.

AU - Salehi, M.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Savinov, V.

AU - Schneider, O.

AU - Schnell, G.

AU - Schwanda, C.

AU - Seino, Y.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shibata, T. A.

AU - Shiu, J. G.

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 - Usov, Y.

AU - Van Hulse, C.

AU - Van Tonder, R.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vorobyev, V.

AU - Waheed, E.

AU - Wang, B.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanuki, S.

AU - Widmann, E.

AU - Won, E.

AU - Ye, H.

AU - Yelton, J.

AU - Yin, J. H.

AU - Yuan, C. Z.

AU - Yusa, Y.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhukova, V.

AU - Zhulanov, V.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - We report evidence for the charged charmed-strange baryon Ξ c(2930) + with a signal significance of 3.9σ with systematic errors included. The charged Ξ c(2930) + is found in its decay to KS0Λc+ in the substructure of B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are [2942.3 ± 4.4 (stat.) ± 1.5 (syst.)] MeV/c2 and [14.8 ± 8.8 (stat.) ± 2.5 (syst.)] MeV, respectively, and the product branching fraction is B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4. We also measure B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a 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) or Yη 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 evidence for the charged charmed-strange baryon Ξ c(2930) + with a signal significance of 3.9σ with systematic errors included. The charged Ξ c(2930) + is found in its decay to KS0Λc+ in the substructure of B¯0→KS0Λc+Λ¯c- decays. The measured mass and width are [2942.3 ± 4.4 (stat.) ± 1.5 (syst.)] MeV/c2 and [14.8 ± 8.8 (stat.) ± 2.5 (syst.)] MeV, respectively, and the product branching fraction is B(B¯0→Ξc(2930)+Λ¯c-)B(Ξc(2930)+→K¯0Λc+)=[2.37±0.51(stat.)±0.31(syst.)]×10-4. We also measure B(B¯0→K¯0Λc+Λ¯c-)=[3.99±0.76(stat.)±0.51(syst.)]×10-4 with greater precision than previous experiments, and present the results of a 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) or Yη 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=85056570344&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-018-6425-5

DO - 10.1140/epjc/s10052-018-6425-5

M3 - Article

AN - SCOPUS:85056570344

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 11

M1 - 928

ER -

Evidence of a structure in ^K¯0Λc+ consistent with a charged Ξ _c(2930) ⁺ , and updated measurement of ^B¯0→^K¯0Λc+Λ¯c- at Belle: Belle Collaboration

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