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  • Measurement of η c ( 1 S ) ...
    Xu, Q. N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Babu, V.; Badhrees, I.; Barberio, E.; Bhuyan, B.; Bračko, M.; Chilikin, K.; Choi, Y.; Cunliffe, S.; Czank, T.; Dash, N.; Di Carlo, S.; Doležal, Z.; Epifanov, D.; Ferber, T.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Goldenzweig, P.; Guan, Y.; Haba, J.; Hayasaka, K.; Hayashii, H.; Hedges, M. T.; Hou, W.-S.; Inami, K.; Inguglia, G.; Itoh, R.; Iwasaki, M.; Jeon, H. B.; Jin, Y.; Julius, T.; Kawasaki, T.; Kiesling, C.; Kodyš, P.; Kotchetkov, D.; Križan, P.; Kulasiri, R.; Kwon, Y.-J.; Lee, S. C.; Li Gioi, L.; Luo, T.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Mizuk, R.; Mussa, R.; Nath, K. J.; Natkaniec, Z.; Nayak, M.; Nisar, N. K.; Nishida, S.; Okuno, S.; Onuki, Y.; Pakhlova, G.; Park, H.; Paul, S.; Pestotnik, R.; Piilonen, L. E.; Rostomyan, A.; Russo, G.; Sanuki, T.; Schneider, O.; Schnell, G.; Schwanda, C.; Seino, Y.; Seon, O.; Sevior, M. E.; Shibata, T.-A.; Shiu, J.-G.; Sokolov, A.; Strube, J. F.; Takizawa, M.; Tamponi, U.; Tenchini, F.; Uchida, M.; Unno, Y.; Uno, S.; Van Hulse, C.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Vossen, A.; Wang, B.; Wang, C. H.; Wang, M.-Z.; Watanabe, M.; Watanabe, Y.; Widmann, E.; Won, E.; Ye, H.; Yusa, Y.; Zhang, Z. P.; Zhukova, V.

    Physical review. D, 10/2018, Letnik: 98, Številka: 7
    Journal Article

    We report the measurement of γγ → ηc ( 1S ) ,ηc ( 2S ) → η'π+π- with η' decays to γρ and ηπ+π- using 941fb-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 Γ γγ Γ γγ B = 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.