학술논문

Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow \omega \omega$
Document Type
Working Paper
Author
Belle CollaborationGuan, Y.Schwartz, A. J.Kinoshita, K.Adachi, I.Aihara, H.Said, S. AlAsner, D. M.Atmacan, H.Ayad, R.Bahinipati, S.Banerjee, Sw.Belous, K.Bennett, J.Bessner, M.Bhardwaj, V.Bhuyan, B.Biswas, D.Bobrov, A.Bodrov, D.Borah, J.Bozek, A.Bračko, M.Branchini, P.Budano, A.Campajola, M.Cao, L.Červenkov, D.Chang, M. -C.Chang, P.Cheon, B. G.Chilikin, K.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.Dubey, S.Ecker, P.Epifanov, D.Ferber, T.Ferlewicz, D.Fulsom, B. G.Gaur, V.Giri, A.Goldenzweig, P.Graziani, E.Gu, T.Gudkova, K.Hadjivasiliou, C.Hayasaka, K.Hayashii, H.Hazra, S.Hedges, M. T.Hou, W. -S.Hsu, C. -L.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Jacobs, W. W.Jia, S.Jin, Y.Joo, K. K.Kawasaki, T.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. J.Kim, Y. -K.Kodyš, P.Korobov, A.Korpar, S.Kovalenko, E.Križan, P.Krokovny, P.Kuhr, T.Kumar, R.Kumara, K.Kumita, T.Kwon, Y. -J.Lai, Y. -T.Lee, S. C.Levit, D.Li, L. K.Li, Y.Li, Y. B.Gioi, L. LiLibby, J.Liventsev, D.Luo, T.Masuda, M.Matsuda, T.Maurya, S. K.Meier, F.Merola, M.Metzner, F.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, H.Park, J.Park, S. -H.Paul, S.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Prim, M. T.Röhrken, M.Russo, G.Sandilya, S.Santelj, L.Savinov, V.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Sevior, M. E.Shan, W.Shiu, J. -G.Solovieva, E.Starič, M.Sumisawa, K.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Tiwary, R.Trabelsi, K.Uchida, M.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Vahsen, S. E.Varvell, K. E.Vinokurova, A.Wang, M. -Z.Watanuki, S.Won, E.Xu, X.Yabsley, B. D.Yan, W.Yook, Y.Yuan, L.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We present a measurement of $B^{0} \rightarrow \omega \omega$, a charmless decay into two vector mesons, using 772 $\times 10^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. The decay is observed with a significance of 7.9 standard deviations. We measure a branching fraction $\mathcal{B} = (1.53 \pm 0.29 \pm 0.17) \times 10^{-6}$, a fraction of longitudinal polarization $f_L = 0.87 \pm 0.13 \pm 0.13$, and a time-integrated $CP$ asymmetry $A_{CP}$ = $-0.44 \pm 0.43 \pm 0.11$, where the first uncertainties listed are statistical and the second are systematic. This is the first observation of $B^{0} \rightarrow \omega \omega$, and the first measurements of $f_L$ and $A_{CP}$ for this decay.
Comment: 7 pages, 1 figure, submitted to Phys. Rev. Lett