Phys. Rev. Lett.
99,
262302
(2007)
[6 pages]
Search for Medium Modifications of the ρ Meson
R. Nasseripour et al. CLAS Collaboration
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R. Nasseripour1, M. H. Wood1, C. Djalali1, D. P. Weygand3, C. Tur1, U. Mosel4, P. Muehlich4, G. Adams34, M. J. Amaryan32, P. Ambrozewicz2, M. Anghinolfi21, G. Asryan41, H. Avakian3, H. Bagdasaryan41,32, N. Baillie40, J. P. Ball6, N. A. Baltzell1, S. Barrow16, M. Battaglieri21, I. Bedlinskiy23, M. Bektasoglu31, M. Bellis9, N. Benmouna17, B. L. Berman17, A. S. Biselli34,9,15, L. Blaszczyk16, S. Bouchigny22, S. Boiarinov3, R. Bradford9, D. Branford14, W. J. Briscoe17, W. K. Brooks3, S. Bültmann32, V. D. Burkert3, C. Butuceanu40, J. R. Calarco29, S. L. Careccia32, D. S. Carman3, B. Carnahan10, L. Casey10, S. Chen10, P. L. Cole19, P. Collins6, P. Coltharp16, D. Crabb39, H. Crannell10, V. Crede16, J. P. Cummings34, N. Dashyan41, R. De Masi11,22, R. De Vita21, E. De Sanctis20, P. V. Degtyarenko3, H. Denizli33, L. Dennis16, A. Deur3, K. V. Dharmawardane32, R. Dickson9, G. E. Dodge32, D. Doughty12,3, M. Dugger6, S. Dytman33, O. P. Dzyubak1, H. Egiyan3, K. S. Egiyan41, L. El Fassi5, L. Elouadrhiri3, P. Eugenio16, G. Fedotov28, G. Feldman17, R. J. Feuerbach9, H. Funsten40, M. Garçon11, G. Gavalian29,32, G. P. Gilfoyle36, K. L. Giovanetti24, F. X. Girod3,11, J. T. Goetz7, C. I. O. Gordon18, R. W. Gothe1, K. A. Griffioen40, M. Guidal22, N. Guler32, L. Guo3, V. Gyurjyan3, C. Hadjidakis22, K. Hafidi5, H. Hakobyan41, R. S. Hakobyan10, C. Hanretty16, J. Hardie12,3, F. W. Hersman29, K. Hicks31, I. Hleiqawi31, M. Holtrop29, C. E. Hyde-Wright32, Y. Ilieva17, D. G. Ireland18, B. S. Ishkhanov28, E. L. Isupov28, M. M. Ito3, D. Jenkins38, H. S. Jo22, J. R. Johnstone18, K. Joo13, H. G. Juengst17,32, N. Kalantarians32, J. D. Kellie18, M. Khandaker30, W. Kim25, A. Klein32, F. J. Klein10, A. V. Klimenko32, M. Kossov23, Z. Krahn9, L. H. Kramer2,3, V. Kubarovsky34, J. Kuhn9, S. E. Kuhn32, S. V. Kuleshov23, J. Lachniet9,32, J. M. Laget11,3, J. Langheinrich1, D. Lawrence27, Ji Li34, K. Livingston18, H. Y. Lu1, M. MacCormick22, N. Markov13, P. Mattione35, S. McAleer16, B. McKinnon18, J. W. C. McNabb9, B. A. Mecking3, S. Mehrabyan33, J. J. Melone18, M. D. Mestayer3, C. A. Meyer9, T. Mibe31, K. Mikhailov23, R. Minehart39, M. Mirazita20, R. Miskimen27, V. Mokeev28, K. Moriya9, S. A. Morrow22,11, M. Moteabbed2, J. Mueller33, E. Munevar17, G. S. Mutchler35, P. Nadel-Turonski17, S. Niccolai17,22, G. Niculescu31,24, I. Niculescu24, B. B. Niczyporuk3, M. R. Niroula32, R. A. Niyazov32,3, M. Nozar3, M. Osipenko21,28, A. I. Ostrovidov16, K. Park25, E. Pasyuk6, C. Paterson18, S. Anefalos Pereira20, J. Pierce39, N. Pivnyuk23, D. Pocanic39, O. Pogorelko23, S. Pozdniakov23, B. M. Preedom1, J. W. Price8, Y. Prok39, D. Protopopescu29,18, B. A. Raue2,3, G. Riccardi16, G. Ricco21, M. Ripani21, B. G. Ritchie6, F. Ronchetti20, G. Rosner18, P. Rossi20, F. Sabatié11, J. Salamanca19, C. Salgado30, J. P. Santoro38,10,3, V. Sapunenko3, R. A. Schumacher9, V. S. Serov23, Y. G. Sharabian3, D. Sharov28, N. V. Shvedunov28, E. S. Smith3, L. C. Smith39, D. I. Sober10, D. Sokhan14, A. Stavinsky23, S. S. Stepanyan25, S. Stepanyan3, B. E. Stokes16, P. Stoler34, I. I. Strakovsky17, S. Strauch17,1, M. Taiuti21, D. J. Tedeschi1, A. Tkabladze17, S. Tkachenko32, L. Todor36,9, M. Ungaro34,13, M. F. Vineyard37,36, A. V. Vlassov23, D. P. Watts18, L. B. Weinstein32, M. Williams9, E. Wolin3, A. Yegneswaran3, L. Zana29, B. Zhang26, J. Zhang32, B. Zhao13, and Z. W. Zhao1 (CLAS Collaboration)
1University of South Carolina, Columbia, South Carolina 29208, USA
2Florida International University, Miami, Florida 33199, USA
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
4University of Giessen, D-35392 Giessen, Germany
5Argonne National Laboratory, Argonne, Illinois 60439, USA
6Arizona State University, Tempe, Arizona 85287-1504, USA
7University of California at Los Angeles, Los Angeles, California 90095-1547, USA
8California State University, Dominguez Hills, Carson, California 90747, USA
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Catholic University of America, Washington, D.C. 20064, USA
11CEA-Saclay, Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France
12Christopher Newport University, Newport News, Virginia 23606, USA
13University of Connecticut, Storrs, Connecticut 06269, USA
14Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
15Fairfield University, Fairfield Connecticut 06824, USA
16Florida State University, Tallahassee, Florida 32306, USA
17The George Washington University, Washington, D.C. 20052, USA
18University of Glasgow, Glasgow G12 8QQ, United Kingdom
19Idaho State University, Pocatello, Idaho 83209, USA
20INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
21INFN, Sezione di Genova, 16146 Genova, Italy
22Institut de Physique Nucleaire Orsay, Orsay, France
23Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
24James Madison University, Harrisonburg, Virginia 22807, USA
25Kyungpook National University, Daegu 702-701, South Korea
26Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
27University of Massachusetts, Amherst, Massachusetts 01003, USA
28Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia
29University of New Hampshire, Durham, New Hampshire 03824-3568, USA
30Norfolk State University, Norfolk, Virginia 23504, USA
31Ohio University, Athens, Ohio 45701, USA
32Old Dominion University, Norfolk, Virginia 23529, USA
33University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
34Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
35Rice University, Houston, Texas 77005-1892, USA
36University of Richmond, Richmond, Virginia 23173, USA
37Union College, Schenectady, New York 12308, USA
38Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
39University of Virginia, Charlottesville, Virginia 22901, USA
40College of William and Mary, Williamsburg, Virginia 23187-8795, USA
41Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 20 July 2007; published 27 December 2007
The photoproduction of vector mesons on various nuclei has been studied using the CLAS detector at Jefferson Laboratory. The vector mesons, ρ, ω, and ϕ, 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 ρ meson. The ρ 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 ρ meson.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.262302
DOI:
10.1103/PhysRevLett.99.262302
PACS:
24.85.+p, 11.30.Rd, 14.40.Cs
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