Phys. Rev. C
76,
025211
(2007)
[16 pages]
π0 photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
M. Dugger et al. CLAS Collaboration
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M. Dugger1, B. G. Ritchie1, J. P. Ball1, P. Collins1, E. Pasyuk1, R. A. Arndt2, W. J. Briscoe2, I. I. Strakovsky2, R. L. Workman2, G. Adams31, M. Amarian29, P. Ambrozewicz12, E. Anciant7, M. Anghinolfi18, B. Asavapibhop24, G. Asryan40, G. Audit7, H. Avakian17,35, H. Bagdasaryan29, N. Baillie39, N. A. Baltzell34, S. Barrow13, M. Battaglieri18, K. Beard21, I. Bedlinskiy20, M. Bektasoglu28,29,*, M. Bellis5, N. Benmouna2, B. L. Berman2, N. Bianchi17, A. S. Biselli5,31, B. E. Bonner32, S. Bouchigny19,35, S. Boiarinov20,35, R. Bradford5, D. Branford11, W. K. Brooks35, S. Bültmann29, V. D. Burkert35, C. Butuceanu39, J. R. Calarco26, S. L. Careccia29, D. S. Carman35, B. Carnahan6, S. Chen13, P. L. Cole16,35, A. Coleman39,†, P. Coltharp13, D. Cords35,‡, P. Corvisiero18, D. Crabb38, H. Crannell6, J. P. Cummings31, E. De Sanctis17, R. De Vita18, P. V. Degtyarenko35, H. Denizli30, L. Dennis13, A. Deur35, K. V. Dharmawardane29, K. S. Dhuga2, R. Dickson5, C. Djalali34, G. E. Dodge29, J. Donnelly14, D. Doughty8,35, P. Dragovitsch13, S. Dytman30, O. P. Dzyubak34,§, H. Egiyan26,35,39, K. S. Egiyan40,‡, L. Elouadrhiri8,35, A. Empl31, P. Eugenio13, R. Fatemi38, G. Fedotov25, G. Feldman2, R. J. Feuerbach5, J. Ficenec37, T. A. Forest29, H. Funsten39, M. Garçon7, G. Gavalian26,29,40, G. P. Gilfoyle33, K. L. Giovanetti21, F. X. Girod7, J. T. Goetz3, R. W. Gothe34, K. A. Griffioen39, M. Guidal19, M. Guillo34, N. Guler29, L. Guo35, V. Gyurjyan35, C. Hadjidakis19, R. S. Hakobyan6, J. Hardie8,35, D. Heddle8,35, F. W. Hersman26, K. Hicks28, I. Hleiqawi28, M. Holtrop26, J. Hu31, M. Huertas34, C. E. Hyde-Wright29, Y. Ilieva2, D. G. Ireland14, B. S. Ishkhanov25, M. M. Ito35, D. Jenkins37, H. S. Jo19, K. Joo9,38, H. G. Juengst2,29, N. Kalantarians29, J. D. Kellie14, M. Khandaker27, K. Y. Kim30, K. Kim22, W. Kim22, A. Klein29, F. J. Klein6,35, A. V. Klimenko29, M. Klusman31, M. Kossov20, Z. Krahn5, L. H. Kramer12,35, V. Kubarovsky31, J. Kuhn5, S. E. Kuhn29, V. Kuznetsov22, J. Lachniet29, J. M. Laget7,35, J. Langheinrich34, D. Lawrence24, T. Lee26, A. C. S. Lima2, K. Livingston14, K. Lukashin6,35, J. J. Manak35, C. Marchand7, L. C. Maximon2, S. McAleer13, B. McKinnon14, J. W. C. McNabb5, B. A. Mecking35, M. D. Mestayer35, C. A. Meyer5, T. Mibe28, K. Mikhailov20, R. Minehart38, M. Mirazita17, R. Miskimen24, V. Mokeev25, K. Moriya5, S. A. Morrow7,19, V. Muccifora17, J. Mueller30, G. S. Mutchler32, P. Nadel-Turonski2, J. Napolitano31, R. Nasseripour12,34, S. Niccolai2,19, G. Niculescu21, I. Niculescu21, B. B. Niczyporuk35, M. Niroula29, R. A. Niyazov29,35, M. Nozar35, G. V. O'Rielly2, M. Osipenko18,25, A. I. Ostrovidov13, K. Park22, C. Paterson14, S. A. Philips2,**, J. Pierce38, N. Pivnyuk20, D. Pocanic38, O. Pogorelko20, S. Pozdniakov20, B. M. Preedom34, J. W. Price3,4, Y. Prok23,35, D. Protopopescu14, L. M. Qin29, B. A. Raue12,35, G. Riccardi13, G. Ricco18, M. Ripani18, F. Ronchetti17, G. Rosner14, P. Rossi17, D. Rowntree23, P. D. Rubin33, F. Sabatié7,29, J. Slamanca16, C. Salgado27, J. P. Santoro6,35, V. Sapunenko18,35, R. A. Schumacher5, V. S. Serov20, A. Shafi2, Y. G. Sharabian35,40, J. Shaw24, S. Simionatto2, A. V. Skabelin23, E. S. Smith35, L. C. Smith38, D. I. Sober6, M. Spraker14, A. Stavinsky20, S. S. Stepanyan22, S. Stepanyan35,40, B. E. Stokes13, P. Stoler31, S. Strauch2,34, M. Taiuti18, S. Taylor32, D. J. Tedeschi34, R. Thompson30, A. Tkabladze2, S. Tkachenko29, L. Todor5, C. Tur34, M. Ungaro9,31, M. F. Vineyard36, A. V. Vlassov20, K. Wang38, L. B. Weinstein29, H. Weller10, D. P. Weygand35, M. Williams5, E. Wolin35, M. H. Wood24,34, A. Yegneswaran35, J. Yun29, L. Zana26, and J. Zhang29 (CLAS Collaboration)
1Arizona State University, Tempe, Arizona 85287-1504, USA
2The George Washington University, Washington, DC 20052, USA
3University of California at Los Angeles, Los Angeles, California 90095-1547, USA
4California State University, Dominguez Hills, Carson, California 90747-0005, USA
5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
6Catholic University of America, Washington, DC 20064, USA
7CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
8Christopher Newport University, Newport News, Virginia 23606, USA
9University of Connecticut, Storrs, Connecticut 06269, USA
10Duke University, Durham, North Carolina 27708-0305, USA
11Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
12Florida International University, Miami, Florida 33199, USA
13Florida State University, Tallahassee, Florida 32306, USA
14University of Glasgow, Glasgow G12 8QQ, United Kingdom
15Physikalisches Institut der Universitaet Giessen, D-35392 Giessen, Germany
16Idaho State University, Pocatello, Idaho 83209, USA
17INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
18INFN, Sezione di Genova, I-16146 Genova, Italy
19Institut de Physique Nucleaire ORSAY, Orsay, France
20Institute of Theoretical and Experimental Physics, Moscow, RU-117259 Russia
21James Madison University, Harrisonburg, Virginia 22807, USA
22Kyungpook National University, 702-701 Daegu, South Korea
23Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
24University of Massachusetts, Amherst, Massachusetts 01003, USA
25Moscow State University, General Nuclear Physics Institute, Moscow, RU-119899 Russia
26University of New Hampshire, Durham, New Hampshire 03824-3568, USA
27Norfolk State University, Norfolk, Virginia 23504, USA
28Ohio University, Athens, Ohio 45701, USA
29Old Dominion University, Norfolk, Virginia 23529, USA
30University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
31Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
32Rice University, Houston, Texas 77005-1892, USA
33University of Richmond, Richmond, Virginia 23173, USA
34University of South Carolina, Columbia, South Carolina 29208, USA
35Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
36Union College, Schenectady, New York 12308, USA
37Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
38University of Virginia, Charlottesville, Virginia 22901, USA
39College of William and Mary, Williamsburg, Virginia 23187-8795, USA
40Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 15 May 2007; published 24 August 2007
Differential cross sections for the reaction γp→pπ0 have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.675 to 2.875 GeV. The results reported here possess greater accuracy in the absolute normalization than previous measurements. They disagree with recent CB-ELSA measurements for the process at forward scattering angles. Agreement with the SAID and MAID fits is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been extended to 3 GeV. Resonance couplings have been extracted and compared to previous determinations.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.025211
DOI:
10.1103/PhysRevC.76.025211
PACS:
13.60.Le, 14.20.Gk, 13.30.Eg, 13.75.Gx
*Present address: Sakarya University, Sakarya, Turkey. †Present address: Systems Planning and Analysis, Alexandria, Virginia 22311, USA. ‡Deceased. §Present address: Department of Radiology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. **Present address: Canberra Industries, Meriden, Connecticut 06457, USA.
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