Observation of a vector charmoniumlike state in e+e-→ Ds+ Ds1 (2536)-+ c. c.

Date Issued
31-12-2019
Author(s)
Jia, S.
Shen, C. P.
Yuan, C. Z.
Wang, X. L.
Adachi, I.
Aihara, H.
Asner, D. M.
Atmacan, H.
Aulchenko, V.
Ayad, R.
Babu, V.
Badhrees, I.
Bakich, A. M.
Behera, P.
Bhuyan, B.
Bilka, T.
Biswal, J.
Bobrov, A.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
Campajola, M.
Cao, L.
ÄŒervenkov, D.
Chang, P.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, H. E.
Cho, K.
Choi, S. K.
Choi, Y.
Cinabro, D.
Cunliffe, S.
De Nardo, G.
Di Capua, F.
Di Carlo, S.
DoleŽal, Z.
Dong, T. V.
Eidelman, S.
Epifanov, D.
Fast, J. E.
Ferber, T.
Fulsom, B. G.
Garg, R.
Gaur, V.
Gabyshev, N.
Garmash, A.
Giri, A.
Goldenzweig, P.
Golob, B.
Hayasaka, K.
Hayashii, H.
Hou, W. S.
Hsu, C. L.
Iijima, T.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jin, Y.
Joo, K. K.
Kang, K. H.
Karyan, G.
Kichimi, H.
Kim, B. H.
Kim, C. H.
Kim, D. Y.
Kim, S. H.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kroeger, R.
Krokovny, P.
Kulasiri, R.
Kuzmin, A.
Kwon, Y. J.
Lalwani, K.
Lange, J. S.
Lee, I. S.
Lee, S. C.
Lewis, P.
Li, C. H.
Li, L. K.
Li, Y. B.
Li Gioi, L.
Indian Institute of Technology, Madras
Lieret, K.
Liventsev, D.
MacQueen, C.
Masuda, M.
Matsuda, T.
Matvienko, D.
Merola, M.
Miyabayashi, K.
Miyata, H.
DOI
Abstract
Using a data sample of 921.9 fb-1 collected with the Belle detector, we study the process of e+e-→Ds+Ds1(2536)-+c.c. via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to Ds+Ds1(2536)-+c.c. with a significance of 5.9σ, including systematic uncertainties. The measured mass and width are (4625.9-6.0+6.2(stat)±0.4(syst)) MeV/c2 and (49.8-11.5+13.9(stat)±4.0(syst)) MeV, respectively. The product of the e+e-→Ds+Ds1(2536)-+c.c. cross section and the branching fraction of Ds1(2536)-→D∗0K-is measured from the DsDs1(2536) threshold to 5.59 GeV.
Volume
100