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

Authors

M. Nozar
Gerard P. Gilfoyle, University of RichmondFollow
et. al.

DOI

10.1103/PhysRevLett.102.102002

Abstract

A search for exotic mesons in the π⁺π⁺π^- system photoproduced by the charge exchange reaction γp → π⁺π⁺π^- 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 J^PC = 1^-+ resonant state in the 1 to 2 GeV mass range. Our partial wave analysis shows production of the a₂(1320) and the π₂(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.

Document Type

Article

Publication Date

3-12-2009

Publisher Statement

Copyright © 2009 American Physical Society. This article first appeared in Physical Review Letters 102, no. 10 (March 13, 2009): 102002:1-6. doi:10.1103/PhysRevLett.102.102002.

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Recommended Citation

Nozar, M., C. Salgado, D. Weygand, L. Guo, G. Adams, Ji Li, P. Eugenio, M. Amaryan, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. Ball, N. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. Berman, A. Biselli, L. Blaszczyk, B. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. Briscoe, W. Brooks, S. Bültmann, V. Burkert, C. Butuceanu, J. Calarco, S. Careccia, D. Carman, B. Carnahan, L. Casey, A. Cazes, S. Chen, L. Cheng, P. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. Dharmawardane, K. Dhuga, R. Dickson, C. Djalali, G. Dodge, D. Doughty, M. Dugger, S. Dytman, O. Dzyubak, H. Egiyan, K. Egiyan, L. El Fassi, L. Elouadrhiri, R. Fatemi, G. Fedotov, R. Feuerbach, T. Forest, A. Fradi, H. Funsten, M. Garçon, G. Gavalian, N. Gevorgyan, G. Gilfoyle, K. Giovanetti, F. Girod, J. Goetz, R. Gothe, K. Griffioen, M. Guidal, M. Guillo, N. Guler, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. Hyde-Wright, Y. Ilieva, D. Ireland, B. Ishkhanov, E. Isupov, M. Ito, D. Jenkins, H. Jo, J. Johnstone, K. Joo, H. Juengst, N. Kalantarians, J. Kellie, M. Khandaker, W. Kim, A. Klein, F. Klein, M. Kossov, Z. Krahn, L. Kramer, V. Kubarovsky, J. Kuhn, S. Kuhn, S. Kuleshov, V. Kuznetsov, J. Lachniet, J. Laget, J. Langheinrich, D. Lawrence, K. Livingston, H. Lu, M. MacCormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. McNabb, B. Mecking, S. Mehrabyan, M. Mestayer, C. Meyer, T. Mibe, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. Niczyporuk, M. Niroula, R. Niyazov, G. O’Rielly, M. Osipenko, A. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, S. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. Preedom, J. Price, Y. Prok, D. Protopopescu, L. Qin, B. Raue, G. Riccardi, G. Ricco, M. Ripani, B. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. Rubin, F. Sabatié, J. Salamanca, J. Santoro, V. Sapunenko, R. Schumacher, V. Serov, Y. Sharabian, D. Sharov, N. Shvedunov, A. Skabelin, E. Smith, L. Smith, D. Sober, D. Sokhan, A. Stavinsky, S. Stepanyan, S. Stepanyan, B. Stokes, P. Stoler, I. Strakovsky, S. Strauch, M. Taiuti, D. Tedeschi, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M. Vineyard, A. Vlassov, D. Watts, L. Weinstein, M. Williams, E. Wolin, M. Wood, A. Yegneswaran, L. Zana, J. Zhang, B. Zhao, and Z. Zhao. "Search for the Photoexcitation of Exotic Mesons in the π⁺π⁺π^- System." Physical Review Letters 102, no. 10 (March 13, 2009): 102002:1-6. doi:10.1103/PhysRevLett.102.102002.