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arXiv · 2403.04340

Search for a pentaquark state decaying into $pJ/\psi$ in $\Upsilon(1,2S)$ inclusive decays at Belle

Belle Collaboration·X. Dong·S. M. Zou·H. Y. Zhang·X. L. Wang·I. Adachi·J. K. Ahn·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·R. Ayad·S. Bahinipati·Sw. Banerjee·M. Bessner·V. Bhardwaj·D. Biswas·D. Bodrov·A. Bozek·M. Bračko·P. Branchini·T. E. Browder·A. Budano·M. Campajola·D. Červenkov·M. -C. Chang·P. Chang·B. G. Cheon·H. E. Cho·K. Cho·S. -K. Choi·Y. Choi·S. Choudhury·S. Das·G. De Nardo·G. De Pietro·R. Dhamija·F. Di Capua·J. Dingfelder·Z. Doležal·T. V. Dong·P. Ecker·D. Epifanov·T. Ferber·D. Ferlewicz·B. G. Fulsom·R. Garg·V. Gaur·A. Giri·P. Goldenzweig·E. Graziani·T. Gu·Y. Guan·K. Gudkova·C. Hadjivasiliou·H. Hayashii·S. Hazra·M. T. Hedges·W. -S. Hou·C. -L. Hsu·K. Inami·N. Ipsita·A. Ishikawa·R. Itoh·M. Iwasaki·W. W. Jacobs·S. Jia·Y. Jin·D. Kalita·T. Kawasaki·D. Y. Kim·K. -H. Kim·Y. J. Kim·Y. -K. Kim·K. Kinoshita·P. Kodyš·A. Korobov·S. Korpar·E. Kovalenko·P. Križan·P. Krokovny·T. Kuhr·R. Kumar·T. Kumita·A. Kuzmin·Y. -J. Kwon·Y. -T. Lai·T. Lam·J. S. Lange·D. Levit·L. K. Li·Y. Li·Y. B. Li·L. Li Gioi·J. Libby·D. Liventsev·Y. Ma·M. Masuda·T. Matsuda·S. K. Maurya
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Abstract

Using the data samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events collected by the Belle detector, we search for a pentaquark state in the $pJ/\psi$ final state from $\Upsilon(1,2S)$ inclusive decays. Here, the charge-conjugate $\bar{p}J/\psi$ is included. We observe clear $pJ/\psi$ production in $\Upsilon(1,2S)$ decays and measure the branching fractions to be $B[\Upsilon(1S) \to pJ/\psi + anything] = [8.1 \pm 0.6(stat.) \pm 0.5(syst.)] \times 10^{-5}$ and $B[\Upsilon(2S) \to pJ/\psi + anything] = [4.3 \pm 0.5(stat.) \pm 0.4(syst.)] \times 10^{-5}$. We also measure the cross section of inclusive $pJ/\psi$ production in $e^+e^-$ annihilation to be $\sigma(e^+e^- \to pJ/\psi + anything) = [108 \pm 11 (stat.) \pm 6(syst.)]$~fb at $\sqrt{s} = 10.52~\hbox{GeV}$ using an 89.5~fb$^{-1}$ continuum data sample. There is no significant $P_c(4312)^+$, $P_c(4440)^+$ or $P_c(4457)^+$ signal found in the $pJ/\psi$ final states in $\Upsilon(1,2S)$ inclusive decays. We determine the upper limits of $B[\Upsilon(1,2S)\to P_c^{+} + anything] \cdot B(P_c^{+}\to pJ/\psi)$ to be at the $10^{-6}$ level.

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Belle Collaboration, X. Dong, S. M. Zou, H. Y. Zhang, X. L. Wang, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, R. Ayad, S. Bahinipati, Sw. Banerjee, M. Bessner, V. Bhardwaj, D. Biswas, D. Bodrov, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M. -C. Chang, P. Chang, B. G. Cheon, H. E. Cho, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, P. Ecker, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, Y. Guan, K. Gudkova, C. Hadjivasiliou, H. Hayashii, S. Hazra, M. T. Hedges, W. -S. Hou, C. -L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, D. Kalita, T. Kawasaki, D. Y. Kim, K. -H. Kim, Y. J. Kim, Y. -K. Kim, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, Y. -T. Lai, T. Lam, J. S. Lange, D. Levit, L. K. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, S. K. Maurya. 2024-03-07. Search for a pentaquark state decaying into $pJ/\psi$ in $\Upsilon(1,2S)$ inclusive decays at Belle. https://arxiv.org/abs/2403.04340

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