Phys. Rev. C
78,
015201
(2008)
[15 pages]
Light vector mesons in the nuclear medium
M. H. Wood et al. CLAS Collaboration
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M. H. Wood1, R. Nasseripour17, D. P. Weygand2, C. Djalali1, C. Tur1, U. Mosel3, P. Muehlich3, G. Adams34, M. J. Amaryan32, P. Ambrozewicz15, M. Anghinolfi21, G. Asryan41, H. Avakian2, H. Bagdasaryan32,41, N. Baillie40, J. P. Ball5, N. A. Baltzell1, S. Barrow16, M. Battaglieri21, I. Bedlinskiy23, M. Bektasoglu31, M. Bellis8, N. Benmouna17, B. L. Berman17, A. S. Biselli8,14,34, L. Blaszczyk16, S. Bouchigny22, S. Boiarinov2, R. Bradford8, D. Branford13, W. J. Briscoe17, W. K. Brooks2, V. D. Burkert2, C. Butuceanu40, J. R. Calarco29, S. L. Careccia32, D. S. Carman2, B. Carnahan9, L. Casey9, S. Chen16, L. Cheng9, P. L. Cole19, P. Collins5, P. Coltharp16, D. Crabb39, H. Crannell9, V. Crede16, J. P. Cummings34, N. Dashyan41, R. De Vita21, E. De Sanctis20, P. V. Degtyarenko2, H. Denizli33, L. Dennis16, A. Deur2, K. V. Dharmawardane32, R. Dickson8, G. E. Dodge32, D. Doughty2,11, M. Dugger5, S. Dytman33, O. P. Dzyubak1, H. Egiyan29, K. S. Egiyan41, L. El Fassi4, L. Elouadrhiri2, P. Eugenio16, G. Fedotov28, G. Feldman17, R. J. Feuerbach8, A. Fradi22, H. Funsten40, M. Garçon10, G. Gavalian29,32, G. P. Gilfoyle36, K. L. Giovanetti24, F. X. Girod10, J. T. Goetz6, C. I. O. Gordon18, R. W. Gothe1, K. A. Griffioen40, M. Guidal22, N. Guler32, L. Guo2, V. Gyurjyan2, C. Hadjidakis22, K. Hafidi4, H. Hakobyan41, R. S. Hakobyan9, C. Hanretty16, J. Hardie2,11, N. Hassall18, 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. Ito2, D. Jenkins38, H. S. Jo22, J. R. Johnstone18, K. Joo12, H. G. Juengst17,32, N. Kalantarians32, J. D. Kellie18, M. Khandaker30, P. Khetarpal34, W. Kim25, A. Klein32, F. J. Klein9, A. V. Klimenko32, M. Kossov23, Z. Krahn8, L. H. Kramer2,15, V. Kubarovsky2,34, J. Kuhn8, S. E. Kuhn32, S. V. Kuleshov23, J. Lachniet8,32, J. M. Laget2,10, J. Langheinrich1, D. Lawrence27, Ji Li34, K. Livingston18, H. Y. Lu1, M. MacCormick22, N. Markov12, P. Mattione35, S. McAleer16, B. McKinnon18, J. W. C. McNabb8, B. A. Mecking2, S. Mehrabyan33, J. J. Melone18, M. D. Mestayer2, C. A. Meyer8, T. Mibe31, K. Mikhailov23, R. Minehart39, M. Mirazita20, R. Miskimen27, V. Mokeev28, K. Moriya8, S. A. Morrow10,22, M. Moteabbed15, J. Mueller33, E. Munevar17, G. S. Mutchler35, P. Nadel-Turonski17, S. Niccolai17,22, G. Niculescu24,31, I. Niculescu24, B. B. Niczyporuk2, M. R. Niroula32, R. A. Niyazov2,32, M. Nozar2, M. Osipenko21,28, A. I. Ostrovidov16, K. Park1, E. Pasyuk5, C. Paterson18, S. Anefalos Pereira20, J. Pierce39, N. Pivnyuk23, D. Pocanic39, O. Pogorelko23, S. Pozdniakov23, B. M. Preedom1, J. W. Price7, Y. Prok26, D. Protopopescu18,29, B. A. Raue2,15, G. Riccardi16, G. Ricco21, M. Ripani21, B. G. Ritchie5, F. Ronchetti20, G. Rosner18, P. Rossi20, F. Sabatié10, J. Salamanca19, C. Salgado30, J. P. Santoro2,9,38, V. Sapunenko2, R. A. Schumacher8, V. S. Serov23, Y. G. Sharabian2, D. Sharov28, N. V. Shvedunov28, E. S. Smith2, L. C. Smith39, D. I. Sober9, D. Sokhan13, A. Stavinsky23, S. Stepanyan2, S. S. Stepanyan25, B. E. Stokes16, P. Stoler34, I. I. Strakovsky17, S. Strauch1,17, M. Taiuti21, D. J. Tedeschi1, A. Tkabladze17, S. Tkachenko32, L. Todor36, M. Ungaro12,34, M. F. Vineyard36,37, A. V. Vlassov23, D. P. Watts13, L. B. Weinstein32, M. Williams8, E. Wolin2, A. Yegneswaran2, L. Zana29, B. Zhang26, J. Zhang32, B. Zhao12, and Z. W. Zhao1 (CLAS Collaboration)
1University of South Carolina, Columbia, South Carolina 29208, USA
2Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
3University of Giessen, D-35392, Giessen, Germany
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5Arizona State University, Tempe, Arizona 85287-1504, USA
6University of California at Los Angeles, Los Angeles, California 90095-1547, USA
7California State University, Dominguez Hills, Carson, California 90747, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Catholic University of America, Washington, DC 20064, USA
10CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
11Christopher Newport University, Newport News, Virginia 23606, USA
12University of Connecticut, Storrs, Connecticut 06269, USA
13Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
14Fairfield University, Fairfield, Connecticut 06824, USA
15Florida International University, Miami, Florida 33199, USA
16Florida State University, Tallahassee, Florida 32306, USA
17The George Washington University, Washington, DC 20052, USA
18University of Glasgow, Glasgow G12 8QQ, United Kingdom, USA
19Idaho State University, Pocatello, Idaho 83209, USA
20INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy, USA
21INFN, Sezione di Genova, I-16146 Genova, Italy, USA
22Institut de Physique Nucleaire ORSAY, Orsay, France, USA
23Institute of Theoretical and Experimental Physics, Moscow, RU-117259, Russia, USA
24James Madison University, Harrisonburg, Virginia 22807, USA
25Kyungpook National University, Daegu 702-701, Republic of Korea
26Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
27University of Massachusetts, Amherst, Massachusetts 01003, USA
28Moscow State University, General Nuclear Physics Institute, RU-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, USA
Received 5 March 2008; published 8 July 2008
The light vector mesons (ρ,ω, and ϕ) were produced in deuterium, carbon, titanium, and iron targets in a search for possible in-medium modifications to the properties of the ρ meson at normal nuclear densities and zero temperature. The vector mesons were detected with the CEBAF Large Acceptance Spectrometer (CLAS) via their decays to e+e-. The rare leptonic decay was chosen to reduce final-state interactions. A combinatorial background was subtracted from the invariant mass spectra using a well-established event-mixing technique. The ρ-meson mass spectrum was extracted after the ω and ϕ signals were removed in a nearly model-independent way. Comparisons were made between the ρ mass spectra from the heavy targets (A>2) with the mass spectrum extracted from the deuterium target. With respect to the ρ-meson mass, we obtain a small shift compatible with zero. Also, we measure widths consistent with standard nuclear many-body effects such as collisional broadening and Fermi motion.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.015201
DOI:
10.1103/PhysRevC.78.015201
PACS:
14.40.Cs, 11.30.Rd, 21.65.Jk, 24.85.+p
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