Observation of a vector charmoniumlike state in $e^+e^- \to D^+_sD_{s1}(2536)^-+c.c.$

Belle Collaboration, 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., Bračko M., Browder T. E.,Campajola M., Cao L., Červenkov 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.,Gioi L. Li, Libby J., Lieret K., Liventsev D., MacQueen C., Masuda M., Matsuda T.,Matvienko D.,Merola M., Miyata H., Mizuk R.,Mussa R., Nath K. J.,Nayak M., Niiyama M.,Nisar N. K., Nishida S.,Nishimura K., Ogawa S., Ono H., Onuki Y., Oskin P.,Pakhlov P.,Pakhlova G.,Pang T., Pardi S.,Park H.,Park S. -H.,Patra S.,Paul S.,Pedlar T. K., Pestotnik R., Piilonen L. E., Popov V., Prencipe E., Prim M. T., Röhrken M., Rostomyan A.,Rout N., Russo G.,Sahoo D., Sakai Y.,Sandilya S., Santelj L., Savinov V., Schneider O., Schnell G., Schwanda C., Seino Y., Senyo K.,Sevior M. E., Shiu J. -G., Shwartz B., Sokolov A., Solovieva E.,Stanič S., Starič M., Stottler Z. S., Sumiyoshi T., Sutcliffe W., Takizawa M., Tanida K., Tenchini F.,Trabelsi K., Uchida M.,Uglov T., Unno Y., Uno S., Usov Y., Van Tonder R., Varner G., Vinokurova A.,Vorobyev V., Wang C. H., Wang M. -Z.,Watanabe M.,Won E., Yang S. B., Ye H., Yin J. H.,Zhang Z. P., Zhilich V., Zhukova V., Zhulanov V.

arxiv（2019）

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摘要

Using a data sample of 921.9 fb$^{-1}$ collected with the Belle detector, we study the process of $e^+e^-\to D^+_sD_{s1}(2536)^-+c.c.$ via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to $D^+_sD_{s1}(2536)^-+c.c.$ with a significance of 5.9$\sigma$, including the systematic uncertainties. The measured mass and width are $(4625.9^{+6.2}_{-6.0}({\rm stat.})\pm0.4({\rm syst.}))~{\rm MeV}/c^{2}$ and $(49.8^{+13.9}_{-11.5}({\rm stat.})\pm4.0({\rm syst.}))~{\rm MeV}$, respectively. The product of the $e^+e^-\to D^+_sD_{s1}(2536)^-+c.c.$ cross section and the branching fraction of $D_{s1}(2536)^-\to{\bar D}^{*0}K^-$ is measured from the $D_s \bar{D}_{s1}(2536)$ threshold to 5.59~GeV.

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