Evidence for B+→hcK+ and observation of ηc(2S)→pp¯π+π−

Date Issued
10-07-2019
Author(s)
Chilikin, K.
Adachi, I.
Asner, D. M.
Aulchenko, V.
Aushev, T.
Ayad, R.
Babu, V.
Badhrees, I.
Bansal, V.
Behera, P.
Beleño, C.
Berger, M.
Bhardwaj, V.
Bilka, T.
Biswal, J.
Bobrov, A.
Bondar, A.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
Campajola, M.
Cao, L.
ÄŒervenkov, D.
Chekelian, V.
Chen, A.
Cheon, B. G.
Cho, K.
Choi, S. K.
Choi, Y.
Cinabro, D.
Cunliffe, S.
Di Carlo, S.
DoleŽal, Z.
Dong, T. V.
Eidelman, S.
Epifanov, D.
Fast, J. E.
Ferber, T.
Fulsom, B. G.
Garg, R.
Gaur, V.
Gabyshev, N.
Garmash, A.
Gelb, M.
Giri, A.
Goldenzweig, P.
Grzymkowska, O.
Haba, J.
Hara, T.
Hayasaka, K.
Hayashii, H.
Hou, W. S.
Hsu, C. L.
Inami, K.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jia, S.
Jin, Y.
Joffe, D.
Joo, K. K.
Julius, T.
Kaliyar, A. B.
Karyan, G.
Kato, Y.
Kiesling, C.
Kim, C. H.
Kim, D. Y.
Kim, S. H.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kotchetkov, D.
Kroeger, R.
Krokovny, P.
Kulasiri, R.
Kumar, R.
Kwon, Y. J.
Lalwani, K.
Lange, J. S.
Lee, J. K.
Lee, J. Y.
Lee, S. C.
Li, L. K.
Li, Y. B.
Li Gioi, L.
Indian Institute of Technology, Madras
Liventsev, D.
Lu, P. C.
Luo, T.
Macnaughton, J.
Macqueen, C.
Masuda, M.
Matsuda, T.
Matvienko, D.
Merola, M.
Miyabayashi, K.
Mizuk, R.
DOI
Abstract
A search for the decays B+→hcK+ and B0→hcKS0 is performed. Evidence for the decay B+→hcK+ is found; its significance is 4.8σ. No evidence is found for B0→hcKS0. The branching fraction for B+→hcK+ is measured to be (3.7-0.9+1.0 -0.8+0.8)×10-5; the upper limit for the B0→hcKS0 branching fraction is 1.4×10-5 at 90% C.L. In addition, a study of the ppπ+π- invariant mass distribution in the channel B+→(ppπ+π-)K+ results in the first observation of the decay ηc(2S)→ppπ+π- with 12.1σ significance. The analysis is based on the 711 fb-1 data sample collected by the Belle detector at the asymmetric-energy e+e- collider KEKB at the (4S) resonance.
Volume
100