학술논문

First measurement of the $B^{+}\to\pi^{+}\pi^{0}\pi^{0}$ branching fraction and \textit{CP} asymmetry
Document Type
Working Paper
Author
Belle CollaborationLai, Y. -T.Adachi, I.Aihara, H.Said, S. AlAsner, D. M.Atmacan, H.Aulchenko, V.Aushev, T.Ayad, R.Babu, V.Bahinipati, S.Behera, P.Belous, K.Bennett, J.Bessner, M.Bhuyan, B.Bilka, T.Bobrov, A.Borah, J.Bozek, A.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Červenkov, D.Chang, M. -C.Chang, P.Chekelian, V.Chen, A.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Cho, S. -J.Choi, S. -K.Choi, Y.Cinabro, D.Cunliffe, S.Czank, T.Das, S.De Nardo, G.De Pietro, G.Dhamija, R.Di Capua, F.Dingfelder, J.Doležal, Z.Dong, T. V.Ferber, T.Fulsom, B. G.Garg, R.Gaur, V.Gabyshev, N.Giri, A.Goldenzweig, P.Graziani, E.Gu, T.Guan, Y.Gudkova, K.Hadjivasiliou, C.Halder, S.Hartbrich, O.Hayasaka, K.Hayashii, H.Higuchi, T.Hou, W. -S.Hsu, C. -L.Iijima, T.Inami, K.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Jacobs, W. W.Jang, E. -J.Jia, S.Jin, Y.Kaliyar, A. B.Kang, K. H.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kinoshita, K.Kodyš, P.Konno, T.Korobov, A.Korpar, S.Kovalenko, E.Križan, P.Kroeger, R.Krokovny, P.Kumar, M.Kumar, R.Kumara, K.Kuzmin, A.Kwon, Y. -J.Lam, T.Lange, J. S.Laurenza, M.Lee, S. C.Levit, D.Li, J.Li, L. K.Li, Y. B.Gioi, L. LiLibby, J.Lieret, K.Liventsev, D.Martini, A.Masuda, M.Matvienko, D.Meier, F.Merola, M.Metzner, F.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Moon, T. J.Mrvar, M.Mussa, R.Nakao, M.Natochii, A.Nayak, L.Nisar, N. K.Nishida, S.Ogawa, S.Pakhlova, G.Pang, T.Pardi, S.Park, H.Park, S. -H.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Prim, M. T.Rostomyan, A.Rout, N.Russo, G.Sahoo, D.Sakai, Y.Sandilya, S.Sangal, A.Santelj, L.Sanuki, T.Savinov, V.Schnell, G.Schueler, J.Schwanda, C.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.Sumisawa, K.Sutcliffe, W.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Trabelsi, K.Uglov, T.Unno, Y.Uno, K.Uno, S.Urquijo, P.Van Tonder, R.Varner, G.Varvell, K. E.Vinokurova, A.Vossen, A.Waheed, E.Wang, C. H.Wang, X. L.Watanabe, M.Watanuki, S.Won, E.Yabsley, B. D.Yan, W.Yang, S. B.Ye, H.Yelton, J.Zhai, Y.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Phys. Rev. Lett. 130, 181804 (2023)
Subject
High Energy Physics - Experiment
Language
Abstract
We study $B^{+}\to \pi^{+}\pi^{0}\pi^{0}$ using 711 $\rm{fb}^{-1}$ of data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We measure an inclusive branching fraction of $(19.0\pm 1.5\pm 1.4)\times 10^{-6}$ and an inclusive \textit{CP} asymmetry of $(9.2 \pm 6.8 \pm 0.7)\%$, where the first uncertainties are statistical and the second are systematic; and a $B^{+}\to \rho(770)^{+}\pi^{0}$ branching fraction of $(11.2\pm 1.1\pm 0.9 ^{+0.8}_{-1.6})\times 10^{-6}$, where the third uncertainty is due to possible interference with $B^{+}\to \rho(1450)^{+}\pi^{0}$. We present the first observation of a structure around 1 GeV/$c^{2}$ in the $\pi^{0}\pi^{0}$ mass spectrum, with a significance of 6.4$\sigma$, and measure a branching fraction to be $(6.9\pm 0.9\pm 0.6)\times 10^{-6}$. We also report a measurement of local \textit{CP} asymmetry in this structure.
Comment: 12 pages, 2 figures