학술논문

Measurement of the $B^+/B^0$ production ratio in $e^+e^-$ collisions at the $\Upsilon(4S)$ resonance using $B \rightarrow J/\psi(\ell\ell) K$ decays at Belle
Document Type
Working Paper
Author
Belle CollaborationChoudhury, S.Sandilya, S.Trabelsi, K.Giri, A.Adachi, I.Aihara, H.Asner, D. M.Atmacan, H.Aushev, T.Ayad, R.Babu, V.Bahinipati, S.Behera, P.Belous, K.Bennett, J.Bessner, M.Bhardwaj, V.Bhuyan, B.Bilka, T.Bodrov, D.Bonvicini, G.Borah, J.Bozek, A.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Červenkov, D.Chang, M. -C.Chen, C.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Cho, S. -J.Choi, S. -K.Choi, Y.Cinabro, D.Das, S.De Pietro, G.Di Capua, F.Dingfelder, J.Doležal, Z.Dong, T. V.Epifanov, D.Ferlewicz, D.Fulsom, B. G.Garg, R.Gaur, V.Gabyshev, N.Goldenzweig, P.Graziani, E.Gu, T.Gudkova, K.Hadjivasiliou, C.Hara, T.Hayasaka, K.Hayashii, H.Hedges, M. T.Herrmann, D.Hou, W. -S.Hsu, C. -L.Inami, K.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Jacobs, W. W.Jang, E. -J.Ji, Q. P.Jia, S.Jin, Y.Joo, K. K.Kang, K. H.Kawasaki, T.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kindo, H.Kinoshita, K.Kodyš, P.Konno, T.Korobov, A.Korpar, S.Kovalenko, E.Križan, P.Krokovny, P.Kumar, M.Kumar, R.Kumara, K.Kwon, Y. -J.Lam, T.Lange, J. S.Laurenza, M.Lee, S. C.Lewis, P.Li, J.Li, L. K.Li, Y. B.Gioi, L. LiLibby, J.Lieret, K.Liventsev, D.Luo, T.Masuda, M.Matsuda, T.Matvienko, D.Maurya, S. K.Meier, F.Merola, M.Metzner, F.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Nakamura, I.Nakao, M.Natkaniec, Z.Natochii, A.Nayak, L.Nayak, M.Nisar, N. K.Nishida, S.Ogawa, S.Ono, H.Oskin, P.Pakhlov, P.Pakhlova, G.Pardi, S.Park, S. -H.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prell, S.Prencipe, E.Prim, M. T.Rout, N.Russo, G.Sakai, Y.Sangal, A.Santelj, L.Savinov, V.Schueler, J.Schwanda, C.Schwartz, A. J.Seino, Y.Senyo, K.Sevior, M. E.Shapkin, M.Sharma, C.Shen, C. P.Shiu, J. -G.Singh, J. B.Sokolov, A.Solovieva, E.Starič, M.Stottler, Z. S.Strube, J. F.Sumihama, M.Sumiyoshi, T.Takizawa, M.Tanida, K.Tenchini, F.Uchida, M.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Ushiroda, Y.Usov, Y.van Tonder, R.Varner, G.Varvell, K. E.Vinokurova, A.Vossen, A.Waheed, E.Wang, E.Wang, M. -Z.Wang, X. L.Watanabe, M.Watanuki, S.Won, E.Xu, X.Yabsley, B. D.Yang, S. B.Yelton, J.Yin, J. H.Yuan, C. Z.Yusa, Y.Zhai, Y.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We measure the ratio of branching fractions for the $\Upsilon (4S)$ decays to $B^+B^-$ and $B^0\bar{B}{}^0$ using $B^+ \rightarrow J/\psi(\ell\ell) K^+$ and $B^0 \rightarrow J/\psi(\ell\ell) K^0$ samples, where $J/\psi(\ell\ell)$ stands for $J/\psi \to \ell^+\ell^-$ ($\ell = e$ or $\mu$), with $711$ fb$^{-1}$ of data collected at the $\Upsilon(4S)$ resonance with the Belle detector. We find the decay rate ratio of $\Upsilon(4S) \rightarrow B^+B^-$ over $\Upsilon(4S) \rightarrow B^0\bar{B}{}^0$ to be $1.065\pm0.012\pm 0.019 \pm 0.047$, which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is systematic due to the assumption of isospin symmetry in $B \to J/\psi(\ell\ell) K$.
Comment: 5 pages, 1 figure