Phys. Rev. C
78,
025210
(2008)
[14 pages]
Electroproduction of ϕ(1020) mesons at 1.4⩽Q2⩽3.8 GeV2 measured with the CLAS spectrometer
J. P. Santoro et al. CLAS Collaboration
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J. P. Santoro1,2, E. S. Smith3, M. Garçon4, M. Guidal5, J. M. Laget3, C. Weiss3, G. Adams35, M. J. Amaryan33, M. Anghinolfi22, G. Asryan43, G. Audit4, H. Avakian3, H. Bagdasaryan33,43, N. Baillie42, J. Ball4, J. P. Ball7, N. A. Baltzell39, S. Barrow17, M. Battaglieri22, I. Bedlinskiy24, M. Bektasoglu33,*, M. Bellis10, N. Benmouna18, B. L. Berman18, A. S. Biselli15,35, L. Blaszczyk17, B. E. Bonner36, C. Bookwalter17, S. Bouchigny5, S. Boiarinov3,24, R. Bradford10, D. Branford13, W. J. Briscoe18, W. K. Brooks38, S. Bültmann33, V. D. Burkert3, C. Butuceanu42, J. R. Calarco30, S. L. Careccia33, D. S. Carman3, L. Casey2, A. Cazes39, S. Chen17, L. Cheng2, P. L. Cole3,20, P. Collins7, P. Coltharp17, D. Cords3,†, P. Corvisiero22, D. Crabb41, H. Crannell2, V. Crede17, J. P. Cummings35, D. Dale20, N. Dashyan43, R. De Masi4, E. De Sanctis21, R. De Vita22, P. V. Degtyarenko3, H. Denizli34, L. Dennis17, A. Deur3, S. Dhamija16, K. V. Dharmawardane33, K. S. Dhuga18, R. Dickson10, C. Djalali39, G. E. Dodge33, D. Doughty3,11, M. Dugger7, S. Dytman34, O. P. Dzyubak39, H. Egiyan3,42,‡, K. S. Egiyan43,†, L. El Fassi6, L. Elouadrhiri3, P. Eugenio17, R. Fatemi41, G. Fedotov29, R. J. Feuerbach10, J. Ficenec1, T. A. Forest20, A. Fradi5, H. Funsten42,†, G. Gavalian30,33, N. Gevorgyan43, G. P. Gilfoyle37, K. L. Giovanetti25, F. X. Girod4, J. T. Goetz8, W. Gohn12, C. I. O. Gordon19, R. W. Gothe39, L. Graham39, K. A. Griffioen42, M. Guillo39, N. Guler33, L. Guo3, V. Gyurjyan3, C. Hadjidakis5, K. Hafidi6, H. Hakobyan43, C. Hanretty17, J. Hardie3,11, N. Hassall19, D. Heddle3,§, F. W. Hersman30, K. Hicks32, I. Hleiqawi32, M. Holtrop30, C. E. Hyde-Wright33, Y. Ilieva18, D. G. Ireland19, B. S. Ishkhanov29, E. L. Isupov29, M. M. Ito3, D. Jenkins1, H. S. Jo5, J. R. Johnstone19, K. Joo3,12, H. G. Juengst33, N. Kalantarians33, D. Keller32, J. D. Kellie19, M. Khandaker31, W. Kim26, A. Klein33, F. J. Klein2, A. V. Klimenko33, M. Kossov24, Z. Krahn10, L. H. Kramer3,16, V. Kubarovsky3, J. Kuhn10,35, S. E. Kuhn33, S. V. Kuleshov24, V. Kuznetsov26, J. Lachniet10,33, J. Langheinrich39, D. Lawrence28, Ji Li35, K. Livingston19, H. Y. Lu39, M. MacCormick5, C. Marchand4, N. Markov12, P. Mattione36, S. McAleer17, B. McKinnon19, J. W. C. McNabb10, B. A. Mecking3, S. Mehrabyan34, J. J. Melone19, M. D. Mestayer3, C. A. Meyer10, T. Mibe32, K. Mikhailov24, R. Minehart41, M. Mirazita21, R. Miskimen28, V. Mokeev3,29, L. Morand4, B. Moreno5, K. Moriya10, S. A. Morrow4,5, M. Moteabbed16, J. Mueller34, E. Munevar18, G. S. Mutchler36, P. Nadel-Turonski18, R. Nasseripour16,39,**, S. Niccolai5,18, G. Niculescu25,32, I. Niculescu3,18,25, B. B. Niczyporuk3, M. R. Niroula33, R. A. Niyazov33,35, M. Nozar3, G. V. O'Rielly18, M. Osipenko22, A. I. Ostrovidov17, K. Park26,39, S. Park17, E. Pasyuk7, C. Paterson19, S. Anefalos Pereira21, S. A. Philips18, J. Pierce41, N. Pivnyuk24, D. Pocanic41, O. Pogorelko24, I. Popa18, S. Pozdniakov24, B. M. Preedom39, J. W. Price9, S. Procureur4, Y. Prok41,††, D. Protopopescu19,30, L. M. Qin33, B. A. Raue3,16, G. Riccardi17, G. Ricco22, M. Ripani22, B. G. Ritchie7, G. Rosner19, P. Rossi21, F. Sabatié4, M. S. Saini17, J. Salamanca20, C. Salgado31, V. Sapunenko3, D. Schott16, R. A. Schumacher10, V. S. Serov24, Y. G. Sharabian3, D. Sharov29, N. V. Shvedunov29, A. V. Skabelin27, L. C. Smith41, D. I. Sober2, D. Sokhan13, A. Stavinsky24, S. S. Stepanyan26, S. Stepanyan3, B. E. Stokes17, P. Stoler35, I. I. Strakovsky18, S. Strauch18,39, M. Taiuti22, D. J. Tedeschi39, A. Tkabladze18,*, S. Tkachenko33, L. Todor10,‡‡, C. Tur39, M. Ungaro12,35, M. F. Vineyard37,40, A. V. Vlassov24, D. P. Watts19,a, L. B. Weinstein33, D. P. Weygand3, M. Williams10, E. Wolin3, M. H. Wood39,b, A. Yegneswaran3, M. Yurov26, L. Zana30, J. Zhang33, B. Zhao12, and Z. W. Zhao39 (CLAS Collaboration)
1Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
2Catholic University of America, Washington, DC 20064, USA
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
4CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
5Institut de Physique Nucleaire ORSAY, Orsay, France
6Argonne National Laboratory, Argonne, Illinois 60439, USA
7Arizona State University, Tempe, Arizona 85287-1504, USA
8University of California at Los Angeles, Los Angeles, California 90095-1547, USA
9California State University, Dominguez Hills, Carson, California 90747, USA
10Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
11Christopher Newport University, Newport News, Virginia 23606, USA
12University of Connecticut, Storrs, Connecticut 06269, USA
13Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
14Emmy-Noether Foundation, Germany
15Fairfield University, Fairfield, Connecticut 06824, USA
16Florida International University, Miami, Florida 33199, USA
17Florida State University, Tallahassee, Florida 32306, USA
18George Washington University, Washington, DC 20052, USA
19University of Glasgow, Glasgow G12 8QQ, United Kingdom
20Idaho State University, Pocatello, Idaho 83209, USA
21INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
22INFN, Sezione di Genova, I-16146 Genova, Italy
23Institute für Strahlen und Kernphysik, Universität Bonn, Germany
24Institute of Theoretical and Experimental Physics, RU-117259 Moscow, Russia
25James Madison University, Harrisonburg, Virginia 22807, USA
26Kyungpook National University, Daegu 702-701, Republic of Korea
27Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
28University of Massachusetts, Amherst, Massachusetts 01003, USA
29Moscow State University, General Nuclear Physics Institute, RU-119899 Moscow, Russia
30University of New Hampshire, Durham, New Hampshire 03824-3568, USA
31Norfolk State University, Norfolk, Virginia 23504, USA
32Ohio University, Athens, Ohio 45701, USA
33Old Dominion University, Norfolk, Virginia 23529, USA
34University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
35Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
36Rice University, Houston, Texas 77005-1892, USA
37University of Richmond, Richmond, Virginia 23173, USA
38Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile
39University of South Carolina, Columbia, South Carolina 29208, USA
40Union College, Schenectady, New York 12308, USA
41University of Virginia, Charlottesville, Virginia 22901, USA
42College of William and Mary, Williamsburg, Virginia 23187-8795, USA
43Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 28 March 2008; published 18 August 2008
Electroproduction of exclusive ϕ vector mesons has been studied with the CLAS detector in the kinematic range 1.4⩽Q2⩽3.8 GeV2,0.0⩽t'⩽3.6 GeV2, and 2.0⩽W⩽3.0 GeV. The scaling exponent for the total cross section as 1/(Q2+Mϕ2)n was determined to be n=2.49±0.33. The slope of the four-momentum transfer t' distribution is bϕ=0.98±0.17 GeV-2. Under the assumption of s-channel helicity conservation, we determine the ratio of longitudinal to transverse cross sections to be R=0.86±0.24. A two-gluon exchange model is able to reproduce the main features of the data.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.025210
DOI:
10.1103/PhysRevC.78.025210
PACS:
13.60.Le, 12.40.Nn, 12.40.Vv, 25.30.Rw
*Current address: Ohio University, Athens, Ohio 45701, USA. †Deceased. ‡Current address: University of New Hampshire, Durham, New Hampshire 03824-3568, USA. §Current address: Christopher Newport University, Newport News, Virginia 23606, USA. **Current address: George Washington University, Washington, DC 20052, USA. ††Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA. ‡‡Current address: University of Richmond, Richmond, Virginia 23173, USA. aCurrent address: Edinburgh University, Edinburgh EH9 3JZ, United Kingdom. bCurrent address: University of Massachusetts, Amherst, Massachusetts 01003, USA.
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