Measurement of eta(c) (1S), eta(c)(2S), and nonresonant eta 'pi(+)pi(-) production via two-photon collisions

  • Xu, Q. N.
  • Adachi, I.
  • Aihara, H.
  • Al Said, S.
  • Asner, D. M.
  • ... Won, E.
  • 외 172명
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초록

We report the measurement of gamma gamma -> eta(c) (1S) -> eta(c) (2S) -> eta'pi(+)pi(-) with eta' decays to gamma rho and eta pi(+)pi(-) using 941 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The eta(c) (1S) mass and width are measured to be M = [2984.6 +/- 0.7 (sta) +/- 2.2 (syst) +/- 0.3 (model)] MeV/c(2) and Gamma = [30.8(-2.2)(+2.3) (stat) +/- 2.5 (syst) +/- 1.4 (model)] MeV, respectively. First observation of eta(c) (2S) -> eta'pi(+)pi(-) with a significance of 5.5 sigma including systematic error is obtained, and the eta(c) (2S)mass is measured to be M = [3635.1 +/- 3.7 (stat) +/- 2.9 (syst) +/- 0.4 (model)] MeV/c(2). The products of the two-photon decay width and branching fraction (B) of decays to eta'pi(+)pi(-) are determined to be Gamma(gamma gamma)Gamma B-gamma gamma = [65.4 +/- 2.6 (stat) +/- 7.8 (syst)] eV for eta(c)(1S) and [5.6(-1.1)(+1.2) (stat) +/- 1.1 (syst)] eV for eta(c) (2S). The cross sections for gamma gamma -> eta'pi(+)pi(-) and eta'f(2)(1270) are measured for the first time.

키워드

QUARKONIUMDECAYSMESONS
제목
Measurement of eta(c) (1S), eta(c)(2S), and nonresonant eta 'pi(+)pi(-) production via two-photon collisions
저자
Xu, Q. N.Adachi, I.Aihara, H.Al Said, S.Asner, D. M.Atmacan, H.Aulchenko, V.Aushev, T.Ayad, R.Babu, V.Badhrees, I.Bakich, A. M.Bansal, V.Barberio, E.Behera, P.Berger, M.Bhardwaj, V.Bhuyan, B.Biswal, J.Bondar, A.Bozek, A.Bracko, M.Cervenkov, D.Chen, A.Cheon, B. G.Chilikin, K.Cho, K.Choi, S. -K.Choi, Y.Cinabro, D.Cunliffe, S.Czank, T.Dash, N.Di Carlo, S.Dolezal, Z.Drasal, Z.Eidelman, S.Epifanov, D.Fast, J. E.Ferber, T.Fulsom, B. G.Garg, R.Gaur, V.Gabyshev, N.Garmash, A.Gelb, M.Goldenzweig, P.Guan, Y.Guido, E.Haba, J.Hayasaka, K.Hayashii, H.Hedges, M. T.Hou, W. -S.Inami, K.Inguglia, G.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Jaegle, I.Jeon, H. B.Jin, Y.Joo, K. K.Julius, T.Kaliyar, A. B.Kang, K. H.Karyan, G.Kawasaki, T.Kichimi, H.Kiesling, C.Kim, D. Y.Kim, H. J.Kim, J. B.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Kroeger, R.Krokovny, P.Kulasiri, R.Kwon, Y. -J.Lee, I. S.Lee, S. C.Li, L. K.Li, Y.Gioi, L. LiLibby, J.Liventsev, D.Lubej, M.Luo, T.Masuda, M.Matsuda, T.Matvienko, D.Merola, M.Miyabayashi, K.Miyata, H.Mizuk, R.Moon, H. K.Mori, T.Mussa, R.Nanut, T.Nath, K. J.Natkaniec, Z.Nayak, M.Nisar, N. K.Nishida, S.Okuno, S.Ono, H.Onuki, Y.Pakhlov, P.Pakhlova, G.Pal, B.Park, H.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Popov, V.Ritter, M.Rostomyan, A.Russo, G.Sakai, Y.Salehi, M.Sandilya, S.Sanuki, T.Savinov, V.Schneider, O.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Seon, O.Sevior, M. E.Shebalin, V.Shen, C. P.Shibata, T. -A.Shimizu, N.Shiu, J. -G.Sokolov, A.Solovieva, E.Staric, M.Strube, J. F.Sumiyoshi, T.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Uchida, M.Uehara, S.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Van Hulse, C.Varner, G.Vinokurova, A.Vorobyev, V.Vossen, A.Wang, B.Wang, C. H.Wang, M. -Z.Wang, P.Wang, X. L.Watanabe, M.Watanabe, Y.Widmann, E.Won, E.Ye, H.Yuan, C. Z.Yusa, Y.Zakharov, S.Zhang, C. C.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.Zupanc, A.
DOI
10.1103/PhysRevD.98.072001
발행일
2018-10-03
유형
Article
저널명
Physical Review D
98
7