학술논문
Search for a pentaquark state decaying into $pJ/\psi$ in $\Upsilon(1,2S)$ inclusive decays at Belle
Document Type
Working Paper
Author
Belle Collaboration; Dong, X.; Zhang, H. Y.; Wang, X. L.; Adachi, I.; Ahn, J. K.; Aihara, H.; Said, S. Al; Asner, D. M.; Atmacan, H.; Ayad, R.; Bahinipati, S.; Banerjee, Sw.; Bessner, M.; Bhardwaj, V.; Biswas, D.; Bodrov, D.; Bozek, A.; Bračko, M.; Branchini, P.; Browder, T. E.; Budano, A.; Campajola, M.; Červenkov, D.; Chang, M. -C.; Chang, P.; Cheon, B. G.; Cho, H. E.; Cho, K.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Das, S.; De Nardo, G.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Dong, T. V.; Ecker, P.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B. G.; Garg, R.; Gaur, V.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gu, T.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Hayashii, H.; Hazra, S.; Hedges, M. T.; Hou, W. -S.; Hsu, C. -L.; Inami, K.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jia, S.; Jin, Y.; Kalita, D.; Kawasaki, T.; Kim, D. Y.; Kim, K. -H.; Kim, Y. J.; Kim, Y. -K.; Kinoshita, K.; Kodyš, P.; Korobov, A.; Korpar, S.; Kovalenko, E.; Križan, P.; Krokovny, P.; Kuhr, T.; Kumar, R.; Kumita, T.; Kuzmin, A.; Kwon, Y. -J.; Lai, Y. -T.; Lam, T.; Lange, J. S.; Levit, D.; Li, L. K.; Li, Y.; Li, Y. B.; Gioi, L. Li; Libby, J.; Liventsev, D.; Ma, Y.; Masuda, M.; Matsuda, T.; Maurya, S. K.; Meier, F.; Merola, M.; Metzner, F.; Miyabayashi, K.; Mussa, R.; Nakamura, I.; Nakano, T.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Nishida, S.; Ogawa, S.; Ono, H.; Pakhlova, G.; Pardi, S.; Park, H.; Park, J.; Park, S. -H.; Passeri, A.; Patra, S.; Paul, S.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Russo, G.; Sandilya, S.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shan, W.; Sharma, C.; Shiu, J. -G.; Singh, J. B.; Solovieva, E.; Starič, M.; Takizawa, M.; Tanida, K.; Tenchini, F.; Tiwary, R.; Uchida, M.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Vinokurova, A.; Watanuki, S.; Won, E.; Yabsley, B. D.; Yan, W.; Yang, S. B.; Yelton, J.; Yin, J. H.; Yook, Y.; Yuan, C. Z.; Yuan, L.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.
Source
Subject
Language
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 $\mathcal{B}[\Upsilon(1S) \to pJ/\psi + anything] = [4.27 \pm 0.16(stat.) \pm 0.20(syst.)] \times 10^{-5}$ and $\mathcal{B}[\Upsilon(2S) \to pJ/\psi + anything] = [3.59 \pm 0.14(stat.) \pm 0.16(syst.)] \times 10^{-5}$. We also measure the cross section of inclusive $pJ/\psi$ production in $e^+e^-$ annihilation to be $\sigma(e^+e^- \to pJ/\psi + anything) = [57.5 \pm 2.1 (stat.) \pm 2.5(syst.)]$~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 $\mathcal{B}[\Upsilon(1,2S)\to P_c^{+} + anything] \cdot \mathcal{B}(P_c^{+}\to pJ/\psi)$ to be at the $10^{-6}$ level.