Search for \(\Upsilon(1S,2S) \to Z^{+}_{c}Z^{(\prime) -}_{c}\) and \(e^{+}e^{-} \to Z^{+}_{c}Z^{(\prime) -}_{c}\) at \(\sqrt{s}\) = 10.52, 10.58, and 10.867 GeV

• Published in: arXiv.org
• Main Authors: Yuan, C Z, Aihara, H, S Al Said, Ayad, R, Babu, V, Bansal, V, Behera, P, Beleño, C, Bilka, T, Biswal, J, Bozek, A, Červenkov, D, Chekelian, V, Chen, A, Cheon, B G, Choudhury, S, Cinabro, D, Dash, N, S Di Carlo, Doležal, Z, Eidelman, S, Fast, J E, Ferber, T, Fulsom, B G, Gaur, V, Gabyshev, N, Gelb, M, Giri, A, Goldenzweig, P, Hara, T, Hayasaka, K, Hayashii, H, Hedges, M T, Hirose, S, Inami, K, Inguglia, G, Ishikawa, A, Iwasaki, Y, Jacobs, W W, Jaegle, I, Jeon, H B, Jin, Y, Julius, T, Kiesling, C, Kinoshita, K, Kodyš, P, Korpar, S, Kotchetkov, D, Kroeger, R, Kumita, T, Lee, I S, Lee, S C, Liventsev, D, Lubej, M, MacNaughton, J, Merola, M, Mizuk, R, Nakano, E, Nanut, T, Nath, K J, Niiyama, M, Nishida, S, Pakhlov, P, Pakhlova, G, Pal, B, Paul, S, Pedlar, T K, Popov, V, Ritter, M, Schneider, O, Seino, Y, T -A Shibata, J -G Shiu, Shwartz, B, Stanič, S, Starič, M, Strube, J F, Sumihama, M, Sumiyoshi, T, Takizawa, M, Tamponi, U, Tanida, K, Tenchini, F, Trabelsi, K, Uchida, M, Uglov, T, Uno, S, Urquijo, P, C Van Hulse, Varner, G, Vinokurova, A, Wang, B, M -Z Wang, Wang, X L, Watanabe, M, Widmann, E, H Ye, Zhilich, V, Zhukova, V, Zhulanov, V
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 15.06.2018
• Subjects: Pair production
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1805.02308

The first search for \(Z_{c}\) pair production in \(\Upsilon(1S)\) and \(\Upsilon(2S)\) decays and in \(e^{+}e^{-}\) annihilation at \(\sqrt{s}\) = 10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90\% credibility level upper limits on their product branching fractions in \(\Upsilon(1S)\) and \(\Upsilon(2S)\) decays (\({\cal B}(\Upsilon(1S,2S)\to Z^{+}_{c}Z^{(\prime) -}_{c})\times{\cal B}(Z^{+}_{c}\to\pi^{+}+c\bar c)\) (\(c\bar c=J/\psi\), \(\chi_{c1}(1P)\), \(\psi(2S)\))) and the product of Born cross section and branching fraction for \(e^{+}e^{-} \to Z^{+}_{c}Z^{(\prime) -}_{c}\) (\(\sigma(e^+e^- \to Z^{+}_{c}Z^{(\prime) -}_{c})\times {\cal B}(Z^{+}_{c} \to \pi^+ +c\bar c)\)) at \(\sqrt{s}\) = 10.52, 10.58, and 10.867 GeV are determined. Here, \(Z_{c}\) refers to the \(Z_{c}(3900)\) and \(Z_{c}(4200)\) observed in the \(\pi J/\psi\) final state, the \(Z_{c1}(4050)\) and \(Z_{c2}(4250)\) in the \(\pi\chi_{c1}(1P)\) state, and the \(Z_{c}(4050)\) and \(Z_{c}(4430)\) in the \(\pi\psi(2S)\) state.