Measurement of Branching Fraction and Search for $CP$ Violation in $B\to φφK$
19 Jan 2021 · S. Mohanty, A. B. Kaliyar, V. Gaur, G. B. Mohanty, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, T. Aziz, V. Babu, S. Bahinipati, P. Behera, M. Bessner, V. Bhardwaj, T. Bilka, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -J. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, S. Eidelman, T. Ferber, B. G. Fulsom, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, O. Grzymkowska, Y. Guan, K. Gudkova, C. Hadjivasiliou, S. Halder, K. Hayasaka, H. Hayashii, W. -S. Hou, C. -L. Hsu, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, K. H. Kang, G. Karyan, B. H. Kim, C. H. Kim, D. Y. Kim, S. H. Kim, Y. -K. Kim, K. Kinoshita, P. Kodyš, T. Konno, S. Korpar, D. Kotchetkov, P. Križan, P. Krokovny, R. Kulasiri, M. Kumar, R. Kumar, K. Kumara, Y. -J. Kwon, K. Lalwani, S. C. Lee, J. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, Z. Liptak, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, M. Merola, K. Miyabayashi, R. Mizuk, T. J. Moon, R. Mussa, M. Nakao, A. Natochii, L. Nayak, M. Nayak, N. K. Nisar, S. Nishida, K. Ogawa, S. Ogawa, Y. Onuki, P. Oskin, G. Pakhlova, S. Pardi, C. W. Park, H. Park, S. -H. Park, S. Patra, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, J. -G. Shiu, B. Shwartz, F. Simon, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, T. Sumiyoshi, M. Takizawa, K. Tanida, Y. Tao, F. Tenchini, M. Uchida, Y. Unno, S. Uno, Y. Usov, S. E. Vahsen, R. Van Tonder, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, C. H. Wang, E. Wang, M. -Z. Wang, P. Wang, X. L. Wang, S. Watanuki, J. Wiechczynski, E. Won, X. Xu, B. D. Yabsley, W. Yan, H. Ye, J. H. Yin, Z. P. Zhang, V. Zhilich, V. Zhukova ·
We report the measurement of branching fractions and $CP$-violation asymmetries in $B\to \phi \phi K$ decays based on a $711\,{\rm fb}^{-1}$ data sample containing $772\times 10^6$ $B\bar{B}$ events. The data were recorded at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. For $B^+ \to \phi \phi K^+$, the branching fraction and $CP$-violation asymmetry measured below the $\eta_{c}$ threshold ($m_{\phi\phi}<2.85\,{\rm GeV}/c^2$) are $[3.43^{\,+\,0.48}_{\,-\,0.46}({\rm stat})\pm 0.22({\rm syst})] \times10^{-6}$ and $-0.02\pm0.11({\rm stat})\pm0.01({\rm syst})$, respectively. Similarly, the branching fraction obtained for $B^0 \to\phi\phi K^0$ below the $\eta_{c}$ threshold is $[3.02^{\,+\,0.75}_{\,-\,0.66} ({\rm stat})\pm \,0.20({\rm syst})]\times10^{-6}$. We also measure the $CP$-violation asymmetry for $B^+ \to\phi\phi K^+$ within the $\eta_{c}$ region ($m_{\phi\phi}\in [2.94,3.02]\,{\rm GeV}/c^2$) to be $+0.12\pm0.12({\rm stat})\pm0.01({\rm syst})$.
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