Search for the Photoexcitation of Exotic Mesons in the pi(+)pi(+)pi(-) System

Nozar, M.; Salgado, C.; Weygand, D.; Guo, L.; Adams, G.; Li, Ji; Eugenio, P.; Amaryan, M.; Anghinolfi, M.; Asryan, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J.; Baltzell, N.; Barrow, S.; Battaglieri, M.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Berman, B.; Biselli, A.; Blaszczyk, L.; Bonner, B.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Briscoe, W.; Brooks, W.; Bültmann, S.; Burkert, V.; Butuceanu, C.; Calarco, J.; Careccia, S.; Carman, D.; Carnahan, B.; Casey, L.; Cazes, A.; Chen, S.; Cheng, L.; Cole, P.; Collins, P.; Coltharp, P.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Crede, V.; Cummings, J.; Dale, D.; Dashyan, N.; De Masi, R.; De Vita, R.; De Sanctis, E.; Degtyarenko, P.; Denizli, H.; Dennis, L.; Deur, A.; Dharmawardane, K.; Dhuga, K.; Dickson, R.; Djalali, C.; Dodge, G.; Doughty, D.; Dugger, M.; Dytman, S.; Dzyubak, O.; Egiyan, H.; Egiyan, K.; El Fassi, L.; Elouadrhiri, L.; Fatemi, R.; Fedotov, G.; Feuerbach, R.; Forest, T.; Fradi, A.; Funsten, H.; Garçon, M.; Gavalian, G.; Gevorgyan, N.; Gilfoyle, G.; Giovanetti, K.; Girod, F.; Goetz, J.; Gothe, R.; Griffioen, K.; Guidal, M.; Guillo, M.; Guler, N.; Gyurjyan, V.; Hadjidakis, C.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Hardie, J.; Hassall, N.; Heddle, D.; Hersman, F.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hyde-Wright, C.; Ilieva, Y.; Ireland, D.; Ishkhanov, B.; Isupov, E.; Ito, M.; Jenkins, D.; Jo, H.; Johnstone, J.; Joo, K.; Juengst, H.; Kalantarians, N.; Kellie, J.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F.; Kossov, M.; Krahn, Z.; Kramer, L.; Kubarovsky, V.; Kuhn, J.; Kuhn, S.; Kuleshov, S.; Kuznetsov, V.; Lachniet, J.; Laget, J.; Langheinrich, J.; Lawrence, D.; Livingston, K.; Lu, H.; MacCormick, M.; Markov, N.; Mattione, P.; McAleer, S.; McKinnon, B.; McNabb, J.; Mecking, B.; Mehrabyan, S.; Mestayer, M.; Meyer, C.; Mibe, T.; Mikhailov, K.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Moreno, B.; Moriya, K.; Morrow, S.; Moteabbed, M.; Mueller, J.; Munevar, E.; Mutchler, G.; Nadel-Turonski, P.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B.; Niroula, M.; Niyazov, R.; O’Rielly, G.; Osipenko, M.; Ostrovidov, A.; Park, K.; Pasyuk, E.; Paterson, C.; Anefalos Pereira, S.; Philips, S.; Pierce, J.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Popa, I.; Pozdniakov, S.; Preedom, B.; Price, J.; Prok, Y.; Protopopescu, D.; Qin, L.; Raue, B.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, B.; Ronchetti, F.; Rosner, G.; Rossi, P.; Rubin, P.; Sabatié, F.; Salamanca, J.; Santoro, J.; Sapunenko, V.; Schumacher, R.; Serov, V.; Sharabian, Y.; Sharov, D.; Shvedunov, N.; Skabelin, A.; Smith, E.; Smith, L.; Sober, D.; Sokhan, D.; Stavinsky, A.; Stepanyan, S.; Stepanyan, S.; Stokes, B.; Stoler, P.; Strakovsky, I.; Strauch, S.; Taiuti, M.; Tedeschi, D.; Thoma, U.; Tkabladze, A.; Tkachenko, S.; Todor, L.; Ungaro, M.; Vineyard, M.; Vlassov, A.; Watts, D.; Weinstein, L.; Williams, M.; Wolin, E.; Wood, M.; Yegneswaran, A.; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z.

Author(s)

Skabelin, Alexander V.

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Alternative title

Search for the Photoexcitation of Exotic Mesons in the π+π+π- System

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Abstract

A search for exotic mesons in the pi+pi+pi- system photoproduced by the charge exchange reaction γp→pi+pi+pi-(n) was carried out by the CLAS Collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A partial wave analysis was performed on a sample of 83 000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic JPC=1-+ resonant state in the 1 to 2 GeV mass range. Our partial wave analysis shows production of the a2(1320) and the pi2(1670) mesons, but no evidence for the a1(1260), nor the π1(1600) exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic π1(1600) cross section, less than 2% of the a2(1320) production.

Date issued

2009-03

URI

http://hdl.handle.net/1721.1/65363

Department

Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physical Review Letters

Publisher

American Physical Society

Citation

Version: Final published version

ISSN

0031-9007

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