Observation of charmed strange meson pair production in ϒ (2S) decays and in e+e- annihilation at s =10.52 GeV

B. S. Gao, W. J. Zhu, X. L. Wang, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, Sw Banerjee, M. Bauer, P. Behera, K. Belous, J. Bennett, M. Bessner, V. Bhardwaj, T. Bilka, D. Biswas, A. BobrovD. Bodrov, A. Bondar, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, D. Červenkov, M. C. Chang, P. Chang, V. Chekelian, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S. K. Choi, Y. Choi, S. Choudhury, D. Cinabro, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. DoleŽal, T. V. Dong, P. Ecker, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Giri, E. Graziani, T. Gu, K. Gudkova, C. Hadjivasiliou, K. Hayasaka, H. Hayashii, S. Hazra, M. T. Hedges, D. Herrmann, W. S. Hou, C. L. Hsu, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E. J. Jang, S. Jia, Y. Jin, K. K. Joo, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K. H. Kim, Y. K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, P. KriŽan, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y. J. Kwon, Y. T. Lai, S. C. Lee, D. Levit, P. Lewis, L. K. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, S. K. Maurya, F. Meier, M. Merola, R. Mizuk, I. Nakamura, M. Nakao, D. Narwal, A. Natochii, L. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, P. Pakhlov, G. Pakhlova, S. Pardi, J. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, G. Russo, S. Sandilya, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, C. Sharma, J. G. Shiu, B. Shwartz, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, S. E. Vahsen, K. E. Varvell, D. Wang, E. Wang, M. Z. Wang, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, J. H. Yin, Y. Yook, C. Z. Yuan, L. Yuan, V. Zhilich, V. Zhukova

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We observe the process ϒ(2S)→Ds(∗)+DsJ- and continuum production e+e-→Ds(∗)+DsJ- at s=10.52 GeV (and their charge conjugates) using the data samples collected by the Belle detector at KEKB, where DsJ- is Ds1(2536)- or Ds2∗(2573)-. Both DsJ- states are identified through their decay into K̄D¯(∗). We measure the products of branching fractions B(ϒ(2S)→Ds(∗)+DsJ-)B(DsJ-→K̄D¯(∗)) and the Born cross sections σBorn(e+e-→Ds(∗)+DsJ-)B(DsJ-→K̄D¯(∗)), and then compare the ratios R1B(ϒ(2S)→Ds(∗)+DsJ-)/B(ϒ(2S)→μ+μ-) for ϒ(2S) decays and R2σBorn(e+e-→Ds(∗)+DsJ-)/σBorn(e+e-→μ+μ-) for continuum production. We obtain R1/R2=9.7±2.3±1.1, 6.8±2.1±0.8, 10.2±3.3±2.5, and 3.4±2.1±0.8 for the Ds+Ds1(2536)-, Ds∗+Ds1(2536)-, Ds+Ds2∗(2573)-, and Ds∗+Ds2∗(2573)- final states in the DsJ-→K-D¯(∗)0 modes, respectively. The measured R1/R2 values indicate that the strong decay dominates in ϒ(2S)→Ds(∗)+DsJ- processes. We also measure the ratios of branching fractions B(Ds1(2536)-→KS0D∗(2010)-)/B(Ds1(2536)-→K-D∗(2007)0)=0.48±0.07±0.02 and B(Ds2∗(2573)-→KS0D-)/B(Ds2∗(2573)-→K-D0)=0.49±0.10±0.02, which are consistent with isospin symmetry. The second ratio is the first measurement of this quantity. Here, the first uncertainties are statistical and the second are systematic.

Original languageEnglish
Article number112015
JournalPhysical Review D
Issue number11
StatePublished - 1 Dec 2023
Externally publishedYes


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