학술논문

Evidence of $h_{b}(\text{2P}) \to \Upsilon(\text{1S})\eta$ decay and search for $h_{b}(\text{1P,2P}) \to \Upsilon(\text{1S})\pi^0$ with the Belle detector
Document Type
Working Paper
Author
Belle CollaborationKovalenko, E.Adachi, I.Aihara, H.Asner, D. M.Aushev, T.Ayad, R.Babu, V.Banerjee, Sw.Belous, K.Bennett, J.Bessner, M.Bilka, T.Biswas, D.Bobrov, A.Bodrov, D.Bondar, A.Bozek, A.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Chang, M. -C.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Cho, S. -J.Choi, S. -K.Choi, Y.Choudhury, S.Dash, N.De Nardo, G.De Pietro, G.Dhamija, R.Di Capua, F.Doležal, Z.Dong, T. V.Dubey, S.Ecker, P.Epifanov, D.Ferlewicz, D.Fulsom, B. G.Garg, R.Gaur, V.Garmash, A.Giri, A.Goldenzweig, P.Graziani, E.Gu, T.Guan, Y.Gudkova, K.Hadjivasiliou, C.Hara, T.Hayasaka, K.Hazra, S.Hou, W. -S.Hsu, C. -L.Inami, K.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Jacobs, W. W.Jin, Y.Kawasaki, T.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kinoshita, K.Kodyš, P.Korobov, A.Korpar, S.Križan, P.Krokovny, P.Kuhr, T.Kumar, R.Kumara, K.Kuzmin, A.Kwon, Y. -J.Lai, Y. -T.Lam, T.Levit, D.Li, L. K.Gioi, L. LiLibby, J.Liventsev, D.Ma, Y.Martini, A.Masuda, M.Matsuda, T.Matvienko, D.Meier, F.Merola, M.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Mussa, R.Nakamura, I.Nakao, M.Natkaniec, Z.Natochii, A.Nayak, L.Nayak, M.Niiyama, M.Nishida, S.Ogawa, S.Ono, H.Pakhlova, G.Pardi, S.Park, J.Park, S. -H.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Prim, M. T.Purohit, M. V.Rout, N.Russo, G.Sandilya, S.Santelj, L.Savinov, V.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Sevior, M. E.Shan, W.Sharma, C.Shiu, J. -G.Shwartz, B.Sokolov, A.Solovieva, E.Starič, M.Sumihama, M.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Tiwary, R.Uchida, M.Unno, Y.Uno, S.Usov, Y.Vinokurova, A.Wang, D.Wang, E.Wang, M. -Z.Wang, X. L.Won, E.Yabsley, B. D.Yan, W.Yang, S. B.Yelton, J.Yin, J. H.Yook, Y.Yuan, C. Z.Zhang, Z. P.Zhilich, V.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We report the first evidence for the $h_{b}(\text{2P}) \to \Upsilon(\text{1S})\eta$ transition with a significance of $3.5$ standard deviations. The decay branching fraction is measured to be $\mathcal{B}[h_{b}(\text{2P}) \to \Upsilon(\text{1S})\eta]=(7.1 ~^{+3.7} _{-3.2}\pm 0.8)\times10^{-3}$, which is noticeably smaller than expected. We also set upper limits on $\pi^0$ transitions of $\mathcal{B}[h_{b}(\text{2P}) \to \Upsilon(\text{1S})\pi^0] < 1.8\times10^{-3}$, and $\mathcal{B}[h_{b}(\text{1P})\to \Upsilon(\text{1S})\pi^0] < 1.8\times10^{-3}$, at the $90\%$ confidence level. These results are obtained with a $131.4$~fb$^{-1}$ data sample collected near the $\Upsilon(\text{5S})$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
Comment: to be submitted to PRL