Evidence for a vector charmoniumlike state in e(+ )e(-) -> Ds+Ds2*(2573)(-) + c.c

S. Jia,C. P. Shen,I Adachi, H. Aihara,S. Al Said,D. M. Asner, H. Atmacan,V Aulchenko,T. Aushev, R. Ayad,I Badhrees,P. Behera, K. Belous,J. Bennett,D. Besson,V Bhardwaj, T. Bilka, J. Biswal, G. Bonvicini,A. Bozek, M. Bracko,T. E. Browder,M. Campajola,D. Cervenkov,P. Chang,A. Chen,B. G. Cheon,K. Chilikin,K. Cho,S-K Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,N. Dash,G. De Nardo,F. Di Capua,Z. Dolezal, V Dong T.,S. Eidelman,D. Epifanov,J. E. Fast,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V Gaur, N. Gabyshev, A. Garmash,A. Giri, P. Goldenzweig, B. Golob,O. Grzymkowska,O. Hartbrich, K. Hayasaka,H. Hayashii,W-S Hou,C-L Hsu, K. Inami,G. Inguglia, A. Ishikawa, R. Itoh,M. Iwasaki, Y. Iwasaki,H. B. Jeon,Y. Jin,K. K. Joo, G. Karyan, T. Kawasaki, C. Kiesling, B. H. Kim,D. Y. Kim,K-H Kim, S. H. Kim,Y-K Kim,K. Kinoshita, P. Kodys, S. Korpar, D. Kotchetkov, P. Krizan,R. Kroeger,P. Krokovny,R. Kulasiri,A. Kuzmin,Y-J Kwon, K. Lalwani, J. S. Lange,S. C. Lee,L. K. Li, Y. B. Li,L. Li Gioi, J. Libby, K. Lieret, D. Liventsev,J. MacNaughton, C. MacQueen,M. Masuda,T. Matsuda,D. Matvienko, M. Merola, R. Mizuk,T. J. Moon,T. Mori,M. Mrvar, M. Nakao, M. Nayak,N. K. Nisar,S. Nishida,S. Ogawa,H. Ono,P. Oskin,P. Pakhlov,G. Pakhlova, S. Pardi,S. Patra,S. Paul,T. K. Pedlar, R. Pestotnik,L. E. Piilonen, T. Podobnik,V Popov, E. Prencipe,M. T. Prim,A. Rostomyan,N. Rout,G. Russo, Y. Sakai,S. Sandilya, L. Santelj, T. Sanuki, V Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo,M. E. Sevior,M. Shapkin, V Shebalin,J-G Shiu, B. Shwartz,E. Solovieva, S. Stanic, M. Staric,Z. S. Stottler, J. F. Strube, M. Sumihama, T. Sumiyoshi, W. Sutcliffe,M. Takizawa,K. Tanida, F. Tenchini,M. Uchida,T. Uglov, Y. Unno,S. Uno,Y. Usov,R. Van Tonder, G. Varner, A. Vinokurova,C. H. Wang,E. Wang,M-Z Wang,P. Wang,X. L. Wang,M. Watanabe, E. Won,X. Xu,W. Yan, S. B. Yang,H. Ye, C. Z. Yuan, Y. Yusa,Z. P. Zhang,V Zhilich,V Zhukova,V Zhulanov

Physical Review D（2020）

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摘要

We report the measurement of e(+) e(-) -> D-s(+) Ds(2)*(2573)(-) c.c. via initial-state radiation using a data sample of an integrated luminosity of 921.9 fb(-1) collected with the Belle detector at the Upsilon(4S) and nearby. We find evidence for an enhancement with a 3.4 sigma significance in the invariant mass of Ds+Ds2*(2573)(-) + c.c. The measured mass and width are (4619.8(-8.0)(+8.9)(stat.) +/- 2.3(syst.)) MeV/c(2) and (47.0(-14.8)(+31.3)(stat.) +/- 4.6(syst.)) MeV, respectively. The mass, width, and quantum numbers of this enhancement are consistent with the charmoniumlike state at 4626 MeV/c(2) recently reported by Belle in e(+) e(-) -> Ds+ Ds1(2536)(-) c.c. The product of the e(+) e(-) -> D-s(+) Ds(2)*(2573)(-) + c.c. cross section and the branching fraction of D-s2*(2573)(-) -> (D) over bar K-0(-) is measured from Ds+Ds2*(2573)(-) threshold to 5.6 GeV.

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