Phys. Rev. D
67,
092001
(2003)
[18 pages]
Kinematically complete measurement of the proton structure function F2 in the resonance region and evaluation of its moments
M. Osipenko et al. (CLAS Collaboration)
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M. Osipenko1,2, G. Ricco2, M. Taiuti2, M. Ripani2, S. Simula3, G. Adams4, E. Anciant5, M. Anghinolfi2, B. Asavapibhop7, G. Audit5, T. Auger5, H. Avakian8,9, H. Bagdasaryan10, J. P. Ball11, S. Barrow24, M. Battaglieri2, K. Beard31, M. Bektasoglu20, N. Bianchi9, A. S. Biselli4, S. Boiarinov8,35, P. Bosted7, S. Bouchigny12,8, R. Bradford17, D. Branford13, W. J. Briscoe14, W. K. Brooks8, V. D. Burkert8, J. R. Calarco15, D. S. Carman16, B. Carnahan18, A. Cazes19, C. Cetina14,17, L. Ciciani20, R. Clark17, P. L. Cole21,8, A. Coleman6,*, D. Cords8,†, P. Corvisiero2, D. Crabb22, H. Crannell18, J. P. Cummings4, E. De Sanctis9, P. V. Degtyarenko8, H. Denizli23, L. Dennis24, R. De Vita2, K. V. Dharmawardane20, C. Djalali19, G. E. Dodge20, J. J. Domingo8, D. Doughty25,8, P. Dragovitsch24, M. Dugger11, S. Dytman23, M. Eckhause6, H. Egiyan6, K. S. Egiyan10, L. Elouadrhiri8, A. Empl4, R. Fatemi22, G. Fedotov1, R. J. Feuerbach17, J. Ficenec26, T. A. Forest20, H. Funsten6, S. J. Gaff27, M. Gai28, G. Gavalian15,10, S. Gilad29, G. P. Gilfoyle30, K. L. Giovanetti31, P. Girard19, K. Griffioen6, E. Golovatch1, C. I. O Gordon32, M. Guidal12, M. Guillo19, L. Guo8, V. Gyurjyan8, C. Hadjidakis12, J. Hardie25,8, D. Heddle25,8, F. W. Hersman15, K. Hicks16, R. S. Hicks7, M. Holtrop15, J. Hu4, C. E. Hyde-Wright20, B. S. Ishkhanov1, M. M. Ito8, D. Jenkins26, K. Joo8,22, J. H. Kelley27, J. D. Kellie32, M. Khandaker33, D. H. Kim34, K. Y. Kim23, K. Kim34, M. S. Kim34, W. Kim34, A. Klein20, F. J. Klein18,8, A. V. Klimenko20, M. Klusman4, M. Kossov35, L. H. Kramer37,8, Y. Kuang6, S. E. Kuhn20, J. Kuhn4, J. Lachniet17, J. M. Laget5, D. Lawrence7, Ji Li4, K. Livingston32, K. Lukashin8,18, J. J. Manak8, C. Marchand5, S. McAleer24, J. McCarthy22, J. W. C. McNabb17, B. A. Mecking8, S. Mehrabyan23, M. D. Mestayer8, C. A. Meyer17, K. Mikhailov35, R. Minehart22, M. Mirazita9, R. Miskimen7, V. Mokeev1,8, L. Morand5, S. A. Morrow12,5, V. Muccifora9, J. Mueller23, L. Y. Murphy14, G. S. Mutchler36, J. Napolitano4, R. Nasseripour37, S. O. Nelson27, S. Niccolai14, G. Niculescu16, I. Niculescu14, B. B. Niczyporuk8, R. A. Niyazov20, M. Nozar8,33, G. V. O’Rielly14, A. K. Opper16, K. Park34, K. Paschke17, E. Pasyuk11, G. Peterson7, S. A. Philips14, N. Pivnyuk35, D. Pocanic22, O. Pogorelko35, E. Polli9, S. Pozdniakov35, B. M. Preedom19, J. W. Price38, Y. Prok22, D. Protopopescu32, L. M. Qin20, B. A. Raue37,8, G. Riccardi24, B. G. Ritchie11, F. Ronchetti9,3, P. Rossi9, D. Rowntree29, P. D. Rubin30, F. Sabatié5,20, K. Sabourov27, C. Salgado33, J. P. Santoro26,8, V. Sapunenko8, M. Sargsyan37,8, R. A. Schumacher17, V. S. Serov35, Y. G. Sharabian8,10, J. Shaw7, S. Simionatto14, A. V. Skabelin29, E. S. Smith8, L. C. Smith22, D. I. Sober18, M. Spraker27, A. Stavinsky35, S. Stepanyan20,10, P. Stoler4, S. Taylor36, D. J. Tedeschi19, U. Thoma8, R. Thompson23, L. Todor17, C. Tur19, M. Ungaro4, M. F. Vineyard30,‡, A. V. Vlassov35, K. Wang22, L. B. Weinstein20, H. Weller27, D. P. Weygand8, C. S. Whisnant19,31, E. Wolin8, M. H. Wood19, A. Yegneswaran8, J. Yun20, B. Zhang29, J. Zhao29, and Z. Zhou29,25 (CLAS Collaboration)
1Moscow State University, 119992 Moscow, Russia
2INFN, Sezione di Genova, and Dipartimento di Fisica dell’Università, 16146 Genova, Italy
3Università di ROMA III, 00146 Roma, Italy
4Rensselaer Polytechnic Institute, Troy, New York 12180
5CEA-Saclay, Service de Physique Nucléaire, F91191 Gif-sur-Yvette, Cedex, France
6College of William and Mary, Williamsburg, Virginia 23187
7University of Massachusetts, Amherst, Massachusetts 01003
8Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
9INFN, Laboratori Nazionali di Frascati, PO 13, 00044 Frascati, Italy
10Yerevan Physics Institute, 375036 Yerevan, Armenia
11Arizona State University, Tempe, Arizona 85287
12Institut de Physique Nucleaire ORSAY, IN2P3 BP 1, 91406 Orsay, France
13Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
14The George Washington University, Washington, DC 20052
15University of New Hampshire, Durham, New Hampshire 03824
16Ohio University, Athens, Ohio 45701
17Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
18Catholic University of America, Washington, D.C. 20064
19University of South Carolina, Columbia, South Carolina 29208
20Old Dominion University, Norfolk, Virginia 23529
21University of Texas at El Paso, El Paso, Texas 79968
22University of Virginia, Charlottesville, Virginia 22901
23University of Pittsburgh, Pittsburgh, Pennsylvania 15260
24Florida State University, Tallahassee, Florida 32306
25Christopher Newport University, Newport News, Virginia 23606
26Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
27Duke University, Durham, North Carolina 27708
28University of Connecticut, Storrs, Connecticut 06269
29Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
30University of Richmond, Richmond, Virginia 23173
31James Madison University, Harrisonburg, Virginia 22807
32University of Glasgow, Glasgow G12 8QQ, United Kingdom
33Norfolk State University, Norfolk, Virginia 23504
34Kyungpook National University, Taegu 702-701, South Korea
35Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
36Rice University, Houston, Texas 77005
37Florida International University, Miami, Florida 33199
38University of California at Los Angeles, Los Angeles, California 90095
Received 23 January 2003; published 13 May 2003
We measured the inclusive electron-proton cross section in the nucleon resonance region (W<2.5GeV) at momentum transfers Q2 below 4.5(GeV/c)2 with the CLAS detector. The large acceptance of CLAS allowed the measurement of the cross section in a large, contiguous two-dimensional range of Q2 and x, making it possible to perform an integration of the data at fixed Q2 over the significant x interval. From these data we extracted the structure function F2 and, by including other world data, we studied the Q2 evolution of its moments, Mn(Q2), in order to estimate higher twist contributions. The small statistical and systematic uncertainties of the CLAS data allow a precise extraction of the higher twists and will require significant improvements in theoretical predictions if a meaningful comparison with these new experimental results is to be made.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.67.092001
DOI:
10.1103/PhysRevD.67.092001
PACS:
13.60.Hb, 12.38.Cy, 12.38.Qk
*Current address: Systems Planning and Analysis, Alexandria, VA 22311. †Deceased. ‡Current address: Union College, Schenectady, NY 12308.
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