Accès ouvert déclaré
2023
preprint
Observation of charmed strange meson pair production in $Υ(2S)$ decays and in $e^{+}e^{-}$ annihilation at $\sqrt{s} = 10.52~ \rm{GeV}$
Belle Collaboration, Bo Gao, W. J. Zhu, X. L. Wang, Ichiro Adachi, H. Aihara, David M. Asner, V. Aulchenko, T. Aushev, Rachid Ayad, V. Babu, Sw. Banerjee, Martin Bauer, P. K. Behera, K. Belous, J. V. Bennett, M. Bessner, Vishal Bhardwaj, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bondar, Andrzej Bozek, M. Bračko, P. Branchini, Thomas E. Browder, A. Budano, D. Červenkov, M.-C. Chang, P. Chang, Vladimir 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, Anjan Kumar Giri, E. Graziani, T. Gu, K. Gudkova, C. Hadjivasiliou, K. Hayasaka, Hisaki Hayashii, Subhradeep Hazra, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, Toru 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, T. Konno, A. Korobov, S. Korpar, P. Križan, M. Kumar, R. Kumar, K. Kumara, Alexander S. Kuzmin, Y.-J. Kwon, Y.-T. Lai, S. C. Lee, D. Levit, Peter M. Lewis, L. K. Li, L. Li Gioi, James Frederick Libby, K. Lieret, Dmitri Liventsev, Yongheng Ma, M. Masuda, T. Matsuda, S. K. Maurya, Frank Meier, Mario Merola, R. Mizuk, Isamu Nakamura, Marcelo Nakao, D. Narwal, A. Natochii, L. Nayak, M. Niiyama, N. K. Nisar, Shohei Nishida, Pavel N. Pakhlov, Galina V. Pakhlova, S. Pardi, J. Park, S. K. Patra, Stephan Martin Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, Elisabetta Prencipe, Markus Tobias Prim, Guido Russo, Saurabh Sandilya, V. Savinov, G. Schnell, Christoph Schwanda, Y. Seino, Katsumi Senyo, Martin E. Sevior, Charu Grover Sharma, J.-G. Shiu, Boris Shwartz, Elena Solovieva, Marko Starič, Z. S. Stottler, Mizuki Sumihama, Kiyoshi Tanida, Francesco Tenchini, Makoto Uchida, Timofey Uglov, Y. Unno, S. Uno, Sven E. Vahsen, K. E. Varvell, D. Wang, E. Wang, M.-Z. Wang, Shoichi Watanuki, Eunil Won, X. P. Xu, B. Yabsley, W. B. Yan, S. B. Yang, J. H. Yin, Y. Yook, C. Z. Yuan, Li Yuan, V. N. Zhilich, Valentina I. Zhukova
0Citations signalées, ce qui n’est pas une note de qualité
0Institutions déclarées
0Pays d’affiliation déclarés
Le résumé fourni par la source
We observe the process $Υ(2S)\to D_s^{(*)+} D_{sJ}^{-}$ and continuum production $e^+e^- \to D_s^{(*)+} D_{sJ}^- $ at $\sqrt{s} = 10.52$ GeV (and their charge conjugates) using the data samples collected by the Belle detector at KEKB, where $D_{sJ}^-$ is $D_{s1}(2536)^-$ or $D^{*}_{s2}(2573)^-$. Both $D_{sJ}^-$ states are identified through their decay into $\bar{K}\bar{D}^{(*)}$. We measure the products of branching fractions ${\cal B}(Υ(2S) \to D_{s}^{(*)+} D_{sJ}^-) {\cal B}(D_{sJ}^-\to \bar{K} \bar{D}^{(*)})$ and the Born cross sections $σ^{\rm Born}(e^+e^- \to D_{s}^{(*)+} D_{sJ}^-) {\cal B}(D_{sJ}^-\to \bar{K} \bar{D}^{(*)})$, and then compare the ratios $R_1 \equiv {\cal B}(Υ(2S)\to D_{s}^{(*)+} D_{sJ}^-)/{\cal B}(Υ(2S)\toμ^{+}μ^-)$ for $Υ(2S)$ decays and $R_2 \equiv σ^{\rm Born}(e^+e^-\to D_{s}^{(*)+}D_{sJ}^-)/σ^{\rm Born}(e^+e^-\to μ^{+}μ^-)$ for continuum production. We obtain $R_1/R_2 = 9.7\pm 2.3 \pm 1.1$, $6.8 \pm 2.1 \pm 0.8$, $10.2 \pm 3.3 \pm 2.5$, and $3.4 \pm 2.1 \pm 0.5$ for the $D_s^+ D_{s1}(2536)^-$, $D_s^{*+} D_{s1}(2536)^-$, $D_s^+ D_{s2}^{*}(2573)^{-}$, and $D_s^{*+} D_{s2}^{*}(2573)^{-}$ final states in the $D_{sJ}^-\to K^{-} \bar{D}^{(*)0}$ modes, respectively. Therefore, the strong decay is expected to dominate in the $Υ(2S)\to D_{s}^{(*)+}D_{sJ}^-$ processes. We also measure the ratios of branching fractions ${\cal B}(D_{s1}(2536)^-\to K_S^0 D^{*}(2010)^{-})/{\cal B}(D_{s1}(2536)^-\to K^{-} D^{*}(2007)^0) = 0.48 \pm 0.07 \pm 0.02$ and ${\cal B}(D_{s2}^{*}(2573)^- \to K_S^0 D^-)/{\cal B}(D_{s2}^{*}(2573)^- \to K^{-}D^0) = 0.49 \pm 0.10 \pm 0.02$, 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.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
La source scientifique ouverte est momentanément indisponible.
Les sujets associés
Particle physics theoretical and experimental studiesHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle Interactions