학술논문

Study of $\chi_{bJ}(2P)\to\omega\Upsilon(1S)$ at Belle
Document Type
Working Paper
Author
Stottler, Z. S.Pedlar, T. K.Fulsom, B. G.Adachi, I.Adamczyk, K.Aihara, H.Said, S. AlAsner, D. M.Atmacan, H.Aushev, T.Ayad, R.Babu, V.Banerjee, Sw.Bauer, M.Behera, P.Belous, K.Bennett, J.Bernlochner, F.Bessner, M.Bilka, T.Biswas, D.Bobrov, A.Bodrov, D.Bonvicini, G.Borah, J.Bozek, A.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Cao, L.Červenkov, D.Chang, M. -C.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Choi, S. -K.Choi, Y.Choudhury, S.Cinabro, D.Das, S.De Nardo, G.De Pietro, G.Dhamija, R.Di Capua, F.Doležal, Z.Dong, T. V.Dubey, S.Ecker, P.Epifanov, D.Ferber, T.Ferlewicz, D.Gaur, V.Garmash, A.Giri, A.Goldenzweig, P.Graziani, E.Gu, T.Guan, Y.Gudkova, K.Hadjivasiliou, C.Hara, T.Hayasaka, K.Hazra, S.Hedges, M. T.Herrmann, D.Hou, W. -S.Hsu, C. -L.Inami, K.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Jacobs, W. W.Jia, S.Jin, Y.Kaliyar, A. B.Kawasaki, T.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kodyš, P.Korobov, A.Korpar, S.Kovalenko, E.Križan, P.Krokovny, P.Kuhr, T.Kumar, M.Kumar, R.Kumara, K.Kuzmin, A.Kwon, Y. -J.Lai, Y. -T.Lam, T.Laurenza, M.Lee, S. C.Levit, D.Lewis, P.Li, L. K.Libby, J.Lieret, K.Liventsev, D.Luo, T.Ma, Y.Masuda, M.Maurya, S. K.Meier, F.Merola, M.Miyabayashi, K.Mohanty, G. B.Mussa, R.Nakamura, I.Nakao, M.Natochii, A.Nayak, L.Nisar, N. K.Nishida, S.Ogawa, K.Ogawa, S.Ono, H.Oskin, P.Pakhlov, P.Pakhlova, G.Pang, T.Pardi, S.Park, J.Park, S. -H.Patra, S.Paul, S.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Prim, M. T.Rout, N.Russo, G.Sandilya, S.Sangal, A.Santelj, L.Savinov, V.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Shan, W.Shapkin, M.Sharma, C.Shiu, J. -G.Sokolov, A.Solovieva, E.Starič, M.Sumihama, M.Sutcliffe, W.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Tiwary, R.Uchida, M.Unno, Y.Uno, S.Vahsen, S. E.Varner, G.Wang, D.Wang, E.Wang, M. -Z.Watanuki, S.Werbycka, O.Won, E.Yabsley, B. D.Yan, W.Yin, J. H.Yuan, C. Z.Yuan, L.Yusa, Y.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We report a study of the hadronic transitions $\chi_{bJ}(2P)\to\omega\Upsilon(1S)$, with $\omega\to\pi^{+}\pi^{-}\pi^{0}$, using $28.2\times10^6~\Upsilon(3S)$ mesons recorded by the Belle detector. We present the first evidence for the near--threshold transition $\chi_{b0}(2P)\to\omega\Upsilon(1S)$, the analog of the charm sector decay $\chi_{c1}(3872)\to\omega J/\psi$, with a branching fraction of $\mathcal{B}\big(\chi_{b0}(2P)\to\omega\Upsilon(1S)\big) = \big(0.55\pm0.19\pm0.07\big)\%$. We also obtain branching fractions of $\mathcal{B}\big(\chi_{b1}(2P)\to\omega\Upsilon(1S)\big) = \big(2.39{}^{+0.20}_{-0.19}\pm0.24\big)\%$ and $\mathcal{B}\big(\chi_{b2}(2P)\to\omega\Upsilon(1S)\big) = \big(0.47{}^{+0.13}_{-0.12}\pm0.06\big)\%$, confirming the measurement of the $\omega$ transitions of the $J=1,2~P$--wave states. The ratio for the $J=2$ to $J=1$ transitions is also measured and found to differ by 3.3 standard deviations from the expected value in the QCD multipole expansion.
Comment: 6 pages, 2 figures