Measurement of ηc (1S), ηc (2S), and nonresonant η′π+π- production via two-photon collisions

Journal Article (Journal Article)

We report the measurement of γγ→ηc(1S),ηc(2S)→η′π+π- with η′ decays to γρ and ηπ+π- using 941 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The ηc(1S) mass and width are measured to be M=[2984.6±0.7 (stat)±2.2 (syst)±0.3 (model)] MeV/c2 and Γ=[30.8-2.2+2.3 (stat)±2.5 (syst)±1.4 (model)] MeV, respectively. First observation of ηc(2S)→η′π+π- with a significance of 5.5σ including systematic error is obtained, and the ηc(2S) mass is measured to be M=[3635.1±3.7 (stat)±2.9 (syst)±0.4 (model)] MeV/c2. The products of the two-photon decay width and branching fraction (B) of decays to η′π+π- are determined to be ΓγγΓγγB=[65.4±2.6 (stat)±7.8 (syst)] eV for ηc(1S) and [5.6-1.1+1.2 (stat)±1.1 (syst)] eV for ηc(2S). The cross sections for γγ→η′π+π- and η′f2(1270) are measured for the first time.

Full Text

Duke Authors

Cited Authors

  • Xu, QN; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, AM; Bansal, V; Barberio, E; Behera, P; Berger, M; Bhardwaj, V; Bhuyan, B; Biswal, J; Bondar, A; Bozek, A; Bračko, M; Červenkov, D; Chen, A; Cheon, BG; Chilikin, K; Cho, K; Choi, SK; Choi, Y; Cinabro, D; Cunliffe, S; Czank, T; Dash, N; Di Carlo, S; DoleŽal, Z; Drásal, Z; Eidelman, S; Epifanov, D; Fast, JE; Ferber, T; Fulsom, BG; Garg, R; Gaur, V; Gabyshev, N; Garmash, A; Gelb, M; Goldenzweig, P; Guan, Y; Guido, E; Haba, J; Hayasaka, K; Hayashii, H; Hedges, MT; Hou, WS; Inami, K; Inguglia, G; Ishikawa, A; Itoh, R; Iwasaki, M; Iwasaki, Y; Jaegle, I; Jeon, HB; Jin, Y; Joo, KK; Julius, T; Kaliyar, AB; Kang, KH; Karyan, G; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, DY; Kim, HJ; Kim, JB; Kodyš, P; Korpar, S; Kotchetkov, D; KriŽan, P; Kroeger, R; Krokovny, P; Kulasiri, R; Kwon, YJ; Lee, IS; Lee, SC; Li, LK; Li, Y; Li Gioi, L; Libby, J; Liventsev, D; Lubej, M; Luo, T; Masuda, M; Matsuda, T; Matvienko, D; Merola, M; Miyabayashi, K; Miyata, H; Mizuk, R; Moon, HK; Mori, T

Published Date

  • October 1, 2018

Published In

Volume / Issue

  • 98 / 7

Electronic International Standard Serial Number (EISSN)

  • 2470-0029

International Standard Serial Number (ISSN)

  • 2470-0010

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.98.072001

Citation Source

  • Scopus