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Search for medium modifications of the rho meson

By R. Nasseripour, M.H. Wood, C. Djalali, D.P. Weygand, C. Tur, U. Mosel, P. Muehlich, G. Adams, M.J. Amaryan, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J.P. Ball, N.A. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B.L. Berman, A.S. Biselli, L. Blaszczyk, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W.J. Briscoe, W.K. Brooks, S. Bultmann, V.D. Burkert, C. Butuceanu, J.R. Calarco, S.L. Careccia, D.S. Carman, B. Carnahan, L. Casey, S. Chen, P.L. Cole, P. Collins, P. Coltharp, D. Crabb, H. Crannell, V. Crede, J.P. Cummings, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P.V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K.V. Dharmawardane, R. Dickson, G.E. Dodge, D. Doughty, M. Dugger, S. Dytman, O.P. Dzyubak, H. Egiyan, K.S. Egiyan, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, G. Feldman, R.J. Feuerbach, H. Funsten, M. Garcon, G. Gavalian, G.P. Gilfoyle, K.L. Giovanetti, F.X. Girod, J.T. Goetz, C.I.O. Gordon, R.W. Gothe, K.A. Griffioen, M. Guidal, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, R.S. Hakobyan, C. Hanretty, J. Hardie, F.W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C.E. Hyde-Wright, Y. Ilieva, D.G. Ireland, B.S. Ishkhanov, E.L. Isupov, M.M. Ito, D. Jenkins, H.S. Jo, J.R. Johnstone, K. Joo, H.G. Juengst, N. Kalantarians, J.D. Kellie, M. Khandaker, W. Kim, A. Klein, F.J. Klein, A.V. Klimenko, M. Kossov, Z. Krahn, L.H. Kramer, V. Kubarovsky, J. Kuhn, S.E. Kuhn, S.V. Kuleshov, J. Lachniet, J.M. Laget, J. Langheinrich, D. Lawrence, J. Li, K. Livingston, H.Y. Lu, M. Maccormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J.W.C. McNabb, B.A. Mecking, S. Mehrabyan, J.J. Melone, M.D. Mestayer, C.A. Meyer, T. Mibe, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, K. Moriya, S.A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G.S. Mutchler, P. Nadel-Turonski, S. Niccolai, G. Niculescu, I. Niculescu, B.B. Niczyporuk, M.R. Niroula, R.A. Niyazov, M. Nozar, M. Osipenko, A.I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, S. Pozdniakov, B.M. Preedom, J.W. Price, Y. Prok, D. Protopopescu, B.A. Raue, G. Riccardi, G. Ricco, M. Ripani, B.G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, F. Sabatié, J. Salamanca, C. Salgado, J.P. Santoro, V. Sapunenko, R.A. Schumacher, V.S. Serov, Y.G. Sharabian, D. Sharov, N.V. Shvedunov, E.S. Smith, L.C. Smith, D.I. Sober, D. Sokhan, A. Stavinsky, S.S. Stepanyan, S. Stepanyan, B.E. Stokes, P. Stoler, I.I. Strakovsky, S. Strauch, M. Taiuti, D.J. Tedeschi, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M.F. Vineyard, A.V. Vlassov, D.P. Watts, L.B. Weinstein, M. Williams, E. Wolin, A. Yegneswaran, L. Zana, B. Zhang, J. Zhang, B. Zhao and Z.W. Zhao

Abstract

The photoproduction of vector mesons on various nuclei has been studied using the CLAS detector at Jefferson Laboratory. The vector mesons, rho, omega, and varphi, are observed via their decay to e;{+}e;{-}, in order to reduce the effects of final-state interactions in the nucleus. Of particular interest are possible in-medium effects on the properties of the rho meson. The rho mass spectrum is extracted from the data on various nuclei, 2H, C, Fe, and Ti. We observe no significant mass shift and some broadening consistent with expected collisional broadening for the rho meson

Topics: QC
Publisher: 'American Physical Society (APS)'
Year: 2007
DOI identifier: 10.1103/PhysRevLett.99.262302
OAI identifier: oai:eprints.gla.ac.uk:56170
Provided by: Enlighten
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