Phys. Rev. Lett.
94,
012301
(2005)
[5 pages]
Onset of Asymptotic Scaling in Deuteron Photodisintegration
P. Rossi et al. CLAS Collaboration
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P. Rossi1, M. Mirazita1, F. Ronchetti1,2, E. De Sanctis1, G. Adams29, P. Ambrozewicz12, E. Anciant4, M. Anghinolfi16, B. Asavapibhop22, G. Audit4, H. Avakian1,34, H. Bagdasaryan27, J. P. Ball3, S. Barrow13, M. Battaglieri16, K. Beard19, M. Bektasoglu27, M. Bellis29, N. Benmouna14, B. L. Berman14, W. Bertozzi21, N. Bianchi1, A. S. Biselli29, S. Boiarinov34,18, B. E. Bonner30, S. Bouchigny17,34, R. Bradford6, D. Branford11, W. J. Briscoe14, W. K. Brooks34, V. D. Burkert34, C. Butuceanu38, J. R. Calarco24, D. S. Carman26, B. Carnahan7, S. Chen13, P. L. Cole33,34, D. Cords34, P. Corvisiero16, D. Crabb37, H. Crannell7, J. P. Cummings29, R. De Vita16, P. V. Degtyarenko34, H. Denizli28, L. Dennis13, A. Deppman1, K. V. Dharmawardane27, K. S. Dhuga14, C. Djalali32, G. E. Dodge27, D. Doughty8,34, P. Dragovitsch13, M. Dugger3, S. Dytman28, O. P. Dzyubak32, H. Egiyan38,34, K. S. Egiyan39, L. Elouadrhiri34, A. Empl29, P. Eugenio13, R. Fatemi37, R. J. Feuerbach6, J. Ficenec36, T. A. Forest27, H. Funsten38, M. Gai9, G. Gavalian24,39, S. Gilad21, G. P. Gilfoyle31, K. L. Giovanetti19, C. I. O. Gordon15, K. Griffioen38, M. Guidal17, M. Guillo32, L. Guo34, V. Gyurjyan34, C. Hadjidakis17, R. S. Hakobyan7, J. Hardie8,34, D. Heddle8,34, F. W. Hersman24, K. Hicks26, R. S. Hicks22, M. Holtrop24, J. Hu29, C. E. Hyde-Wright27, Y. Ilieva14, M. M. Ito34, D. Jenkins36, H. S. Jo17, K. Joo34,37, J. D. Kellie15, M. Khandaker25, K. Y. Kim28, K. Kim20, W. Kim20, A. Klein27, F. J. Klein7,34, A. V. Klimenko27, M. Klusman29, M. Kossov18, L. H. Kramer12,34, J. Kuhn6, S. E. Kuhn27, J. Lachniet6, J. M. Laget4, D. Lawrence22, Ji Li29, A. C. S. Lima14, K. Livingston15, K. Lukashin34,*, J. J. Manak34, C. Marchand4, S. McAleer13, J. McCarthy37, J. W. C. McNabb6, B. A. Mecking34, S. Mehrabyan28, J. J. Melone15, M. D. Mestayer34, C. A. Meyer6, K. Mikhailov18, R. Miskimen22, V. Mokeev23,34, L. Morand4, S. A. Morrow17, V. Muccifora1, J. Mueller28, G. S. Mutchler30, J. Napolitano29, R. Nasseripour12, S. Niccolai14, G. Niculescu26, I. Niculescu14, B. B. Niczyporuk34, R. A. Niyazov34, M. Nozar34, J. T. O'Brien7, G. V. O'Rielly14, M. Osipenko23, A. Ostrovidov13, K. Park20, E. Pasyuk3, G. Peterson22, S. A. Philips14, N. Pivnyuk18, D. Pocanic37, O. Pogorelko18, E. Polli1, S. Pozdniakov18, B. M. Preedom32, J. W. Price5, Y. Prok37, D. Protopopescu24, L. M. Qin27, B. A. Raue12,34, G. Riccardi13, G. Ricco16, M. Ripani16, B. G. Ritchie3, G. Rosner15, D. Rowntree21, P. D. Rubin31, F. Sabatié4,27, C. Salgado25, J. P. Santoro36,34, V. Sapunenko16, R. A. Schumacher6, V. S. Serov18, Y. G. Sharabian34,39, J. Shaw22, S. Simionatto14, A. V. Skabelin21, E. S. Smith34, L. C. Smith37, D. I. Sober7, M. Spraker10, A. Stavinsky18, S. Stepanyan27,39, B. Stokes13, P. Stoler29, I. I. Strakovsky14, S. Strauch14, M. Taiuti16, S. Taylor30, D. J. Tedeschi32, U. Thoma34, R. Thompson28, A. Tkabladze26, L. Todor6, C. Tur32, M. Ungaro29, M. F. Vineyard35, A. V. Vlassov18, K. Wang37, L. B. Weinstein27, H. Weller10, D. P. Weygand34, C. S. Whisnant32,†, E. Wolin34, M. H. Wood32, A. Yegneswaran34, J. Yun27, B. Zhang21, and Z. Zhou21,‡ (CLAS Collaboration)
1Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, PO 13, 00044 Frascati, Italy
2Università di ROMA III, 00146 Roma, Italy
3Arizona State University, Tempe, Arizona 85287, USA
4CEA-Saclay, Service de Physique Nucléaire, F91191 Gif-sur-Yvette, Cedex, France
5University of California at Los Angeles, Los Angeles, California 90095, USA
6Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
7Catholic University of America, Washington, D.C. 20064, USA
8Christopher Newport University, Newport News, Virginia 23606, USA
9University of Connecticut, Storrs, Connecticut 06269, USA
10Duke University, Durham, North Carolina 27708, USA
11Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
12Florida International University, Miami, Florida 33199, USA
13Florida State University, Tallahassee, Florida 32306, USA
14The George Washington University, Washington, D.C. 20052, USA
15University of Glasgow, Glasgow G12 8QQ, United Kingdom
16Istituto Nazionale di Fisica Nucleare, Sezione di Genova, 16146 Genova, Italy
17Institut de Physique Nucleaire ORSAY, IN2P3 BP 1, 91406 Orsay, France
18Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia
19James Madison University, Harrisonburg, Virginia 22807, USA
20Kyungpook National University, Taegu 702-701, Republic of Korea
21Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
22University of Massachusetts, Amherst, Massachusetts 01003, USA
23Moscow State University, 119899 Moscow, Russia
24University of New Hampshire, Durham, New Hampshire 03824, USA
25Norfolk State University, Norfolk, Virginia 23504, USA
26Ohio University, Athens, Ohio 45701, USA
27Old Dominion University, Norfolk, Virginia 23529, USA
28University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
29Rensselaer Polytechnic Institute, Troy, New York 12180, USA
30Rice University, Houston, Texas 77005, USA
31University of Richmond, Richmond, Virginia 23173, USA
32University of South Carolina, Columbia, South Carolina 29208, USA
33University of Texas at El Paso, El Paso, Texas 79968, USA
34Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
35Union College, Schenectady, New York 12308, USA
36Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
37University of Virginia, Charlottesville, Virginia 22901, USA
38College of William and Mary, Williamsburg, Virginia 23187, USA
39Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 21 April 2004; published 6 January 2005
We investigate the transition from the nucleon-meson to the quark-gluon description of the strong interaction using the photon energy dependence of the d(γ,p)n differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between 30° and 150°. A possible signature for this transition is the onset of cross-section s-11 scaling with the total energy squared, s, at some proton transverse momentum PT. The results show that the scaling has been reached for proton transverse momentum above about 1.1 GeV/c. This may indicate that the quark-gluon regime is reached above this momentum.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.012301
DOI:
10.1103/PhysRevLett.94.012301
PACS:
24.85.+p, 21.45.+v, 25.20.–x
*Current address: Catholic University of America, WA, D.C. 20064, USA. †Current address: James Madison University, Harrisonburg, VA 22807, USA. ‡Current address: Christopher Newport University, Newport News, VA 23606, USA.
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