Evidence for $B^+ \rightarrow h_c K^+$ and observation of $η_c(2S) \to p \bar{p} π^+ π^-$
Creators: name: Belle Collaboration
name: Chilikin, K.
name: Adachi, I.
name: Asner, D. M.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Badhrees, I.
name: Bansal, V.
name: Behera, P.
name: Beleño, C.
name: Berger, M.
name: Bhardwaj, V.
name: Bilka, T.
name: Biswal, J.
name: Bobrov, A.
name: Bondar, A.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Campajola, M.
name: Cao, L.
name: Červenkov, D.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Cho, K.
name: Choi, S. -K.
name: Choi, Y.
name: Cinabro, D.
name: Cunliffe, S.
name: Di Carlo, S.
name: Doležal, Z.
name: Dong, T. V.
name: Eidelman, S.
name: Epifanov, D.
name: Fast, J. E.
name: Ferber, T.
name: Fulsom, B. G.
name: Garg, R.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Gelb, M.
name: Giri, A.
name: Goldenzweig, P.
name: Grzymkowska, O.
name: Haba, J.
name: Hara, T.
name: Hayasaka, K.
name: Hayashii, H.
name: Hou, W. -S.
name: Hsu, C. -L.
name: Inami, K.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jia, S.
name: Jin, Y.
name: Joffe, D.
name: Joo, K. K.
name: Julius, T.
name: Kaliyar, A. B.
name: Karyan, G.
name: Kato, Y.
name: Kiesling, C.
name: Kim, C. H.
name: Kim, D. Y.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Kroeger, R.
name: Krokovny, P.
name: Kulasiri, R.
name: Kumar, R.
name: Kwon, Y. -J.
name: Lalwani, K.
name: Lange, J. S.
name: Lee, J. K.
name: Lee, J. Y.
name: Lee, S. C.
name: Li, L. K.
name: Li, Y. B.
name: Gioi, L. Li
name: Libby, J.
name: Liventsev, D.
name: Lu, P. -C.
name: Luo, T.
name: MacNaughton, J.
name: MacQueen, C.
name: Masuda, M.
name: Matsuda, T.
name: Matvienko, D.
name: Merola, M.
name: Miyabayashi, K.
name: Mizuk, R.
name: Mohanty, G. B.
name: Mori, T.
name: Nakao, M.
name: Nath, K. J.
name: Nayak, M.
name: Niiyama, M.
name: Nisar, N. K.
name: Nishida, S.
name: Nishimura, K.
name: Ono, H.
name: Onuki, Y.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pal, B.
name: Pardi, S.
name: Park, H.
name: Patra, S.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Popov, V.
name: Ritter, M.
name: Rostomyan, A.
name: Russo, G.
name: Sakai, Y.
name: Salehi, M.
name: Sandilya, S.
name: Sanuki, T.
name: Savinov, V.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Seino, Y.
name: Senyo, K.
name: Sevior, M. E.
name: Shen, C. P.
name: Shiu, J. -G.
name: Shwartz, B.
name: Simon, F.
name: Sokolov, A.
name: Solovieva, E.
name: Starič, M.
name: Stottler, Z. S.
name: Strube, J. F.
name: Sumiyoshi, T.
name: Sutcliffe, W.
name: Takizawa, M.
name: Tamponi, U.
name: Tanida, K.
name: Tenchini, F.
name: Trabelsi, K.
name: Uchida, M.
name: Uno, S.
name: Urquijo, P.
name: Usov, Y.
name: Van Tonder, R.
name: Varner, G.
name: Vinokurova, A.
name: Wang, B.
name: Wang, C. H.
name: Wang, M. -Z.
name: Wang, P.
name: Watanabe, M.
name: Watanuki, S.
name: Won, E.
name: Yang, S. B.
name: Ye, H.
name: Yelton, J.
name: Yin, J. H.
name: Yuan, C. Z.
name: Zhang, J.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search for the decays $B^+ \rightarrow h_c K^+$ and $B^0 \rightarrow h_c K_S^0$ is performed. Evidence for the decay $B^+ \rightarrow h_c K^+$ is found; its significance is $4.8σ$. No evidence is found for $B^0 \rightarrow h_c K_S^0$. The branching fraction for $B^+ \rightarrow h_c K^+$ is measured to be $(3.7^{+1.0}_{-0.9}{}^{+0.8}_{-0.8}) \times 10^{-5}$; the upper limit for the $B^0 \rightarrow h_c K_S^0$ branching fraction is $1.4 \times 10^{-5}$ at $90\%$ C.L. In addition, a study of the $p \bar{p} π^+ π^-$ invariant mass distribution in the channel $B^+ \to (p \bar{p} π^+ π^-) K^+$ results in the first observation of the decay $η_c(2S) \to p \bar{p} π^+ π^-$ with $12.1σ$ significance. The analysis is based on the 711 $\mathrm{fb}^{-1}$ data sample collected by the Belle detector at the asymmetric-energy $e^+ e^-$ collider KEKB at the $Υ(4S)$ resonance.
description: 16 pages, 7 figures