Measurement of e+e-→π+π-ψ(2S) via initial state radiation at Belle

Wang, X. L.; Yuan, C. Z.; Shen, C. P.; Wang, P.; Abdesselam, A.; Adachi, I.; Aihara, H.; Al Said, S.; Arinstein, K.; Asner, D. M.; Ayad, R.; Bakich, A. M.; Bansal, V.; Bhuyan, B.; Bobrov, A.; Bonvicini, G.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chang, P.; Chekelian, V.; Chen, A.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, K.; Chobanova, V.; Choi, S. -K.; Choi, Y.; Cinabro, D.; Dalseno, J.; Danilov, M.; Doležal, Z.; Drásal, Z.; Drutskoy, A.; Dutta, K.; Eidelman, S.; Farhat, H.; Fast, J. E.; Ferber, T.; Gaur, V.; Garmash, A.; Getzkow, D.; Gillard, R.; Goh, Y. M.; Haba, J.; Hayasaka, K.; Hayashii, H.; He, X. H.; Hou, W. -S.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Joffe, D.; Julius, T.; Kang, K. H.; Kato, E.; Kawasaki, T.; Kiesling, C.; Kim, D. Y.; Kim, H. J.; Kim, J. B.; Kim, J. H.; Kim, M. J.; Kim, S. H.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Kodyš, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kuzmin, A.; Kwon, Y. -J.; Lange, J. S.; Lee, I. S.; Lewis, P.; Li, Y.; Li Gioi, L.; Libby, J.; Liventsev, D.; Lukin, P.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Moll, A.; Mori, T.; Mussa, R.; Nakano, E.; Nakao, M.; Nanut, T.; Natkaniec, Z.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Okuno, S.; Olsen, S. L.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Ribežl, E.; Ritter, M.; Rostomyan, A.; Ryu, S.; Sakai, Y.; Sandilya, S.; Santelj, L.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Semmler, D.; Senyo, K.; Shebalin, V.; Shibata, T. -A.; Shiu, J. -G.; Sibidanov, A.; Simon, F.; Sohn, Y. -S.; Sokolov, A.; Solovieva, E.; Starič, M.; Steder, M.; Sumiyoshi, T.; Tamponi, U.; Tanida, K.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Usov, Y.; Van Hulse, C.; Vanhoefer, P.; Varner, G.; Vinokurova, A.; Wagner, M. N.; Watanabe, Y.; Won, E.; Yashchenko, S.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.; Zupanc, A.

doi:10.1103/PhysRevD.91.112007

Title: Measurement of $e^{+} e^{-} \to π^{+} π^{-} ψ (2 S)$ via initial state radiation at Belle

Journal Article · Fri Jun 12 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.91.112007· OSTI ID:1594433

Wang, X. L.; Yuan, C. Z.; Shen, C. P.; Wang, P.; Abdesselam, A.; Adachi, I.; Aihara, H.; Al Said, S.; Arinstein, K.; Asner, D. M.; Ayad, R.; Bakich, A. M.; Bansal, V.; Bhuyan, B.; Bobrov, A.; Bonvicini, G.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chang, P. more »

We report here measurement of the cross section of $e^{+} e^{-} \to π^{+} π^{-} ψ (2 S)$ between 4.0 and 5.5 GeV, based on an analysis of initial state radiation events in a $980 {fb}^{- 1}$ data sample recorded with the Belle detector. The properties of the $Y (4360)$ and $Y (4660)$ states are determined. Fitting the mass spectrum of $π^{+} π^{-} ψ (2 S)$ with two coherent Breit-Wigner functions, we discover two solutions with identical mass and width but different couplings to electron-positron pairs: $M_{Y (4360)} = (4347 \pm 6 \pm 3) MeV / c^{2}$ , $Γ_{Y (4360)} = (103 \pm 9 \pm 5) MeV$ , $M_{Y (4660)} = (4652 \pm 10 \pm 8) MeV / c^{2}$ , $Γ_{Y (4660)} = (68 \pm 11 \pm 1) MeV$ ; and $B [Y (4360) \to π^{+} π^{-} ψ (2 S)] \cdot Γ_{Y (4360)}^{e^{+} e^{-}} = (10.9 \pm 0.6 \pm 0.7) eV$ and $B [Y (4660) \to π^{+} π^{-} ψ (2 S)] \cdot Γ_{Y (4660)}^{e^{+} e^{-}} = (8.1 \pm 1.1 \pm 0.5) eV$ for one solution; or $B [Y (4360) \to π^{+} π^{-} ψ (2 S)] \cdot Γ_{Y (4360)}^{e^{+} e^{-}} = (9.2 \pm 0.6 \pm 0.6) eV$ and $B [Y (4660) \to π^{+} π^{=} ψ (2 S)] \cdot Γ_{Y (4660)}^{e^{+} e^{-}} = (2.0 \pm 0.3 \pm 0.2) eV$ for the other. Here, the first errors are statistical and the second systematic. Evidence for a charged charmoniumlike structure at $4.05 GeV / c^{2}$ is observed in the $π^{\pm} ψ (2 S)$ intermediate state in the $Y (4360)$ decays. decays.

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Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: Belle Collaboration

Grant/Contract Number:: SC0009973

OSTI ID:: 1594433

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 11; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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