Phys. Rev. C
75,
035203
(2007)
[7 pages]
Quark-hadron duality in spin structure functions g1p and g1d
P. E. Bosted et al. CLAS Collaboration
Show All Authors/Affiliations
Hide All Authors/Affiliations
P. E. Bosted35,*, K. V. Dharmawardane29,†, G. E. Dodge29, T. A. Forest29, S. E. Kuhn29, Y. Prok38,‡, G. Adams31, M. Amarian29, P. Ambrozewicz12, M. Anghinolfi18, G. Asryan40, H. Avakian17,35, H. Bagdasaryan29,40, N. Baillie39, J. P. Ball2, N. A. Baltzell34, S. Barrow13, V. Batourine22, M. Battaglieri18, K. Beard21, I. Bedlinskiy20, M. Bektasoglu29, M. Bellis5,31, N. Benmouna14, A. S. Biselli11, B. E. Bonner32, S. Bouchigny19,35, S. Boiarinov20,35, R. Bradford5, D. Branford10, W. K. Brooks35, S. Bültmann29, V. D. Burkert35, C. Butuceanu39, J. R. Calarco26, S. L. Careccia29, D. S. Carman28, B. Carnahan6, A. Cazes34, S. Chen13, P. L. Cole16,35, P. Collins2, P. Coltharp13, D. Cords35,§, P. Corvisiero18, D. Crabb38, H. Crannell6, V. Crede13, J. P. Cummings31, R. De Masi7, R. DeVita18, E. De Sanctis17, P. V. Degtyarenko35, H. Denizli30, L. Dennis13, A. Deur35, C. Djalali34, J. Donnelly15, D. Doughty8,35, P. Dragovitsch13, M. Dugger2, S. Dytman30, O. P. Dzyubak34, H. Egiyan35,39,**, K. S. Egiyan40,§, L. Elouadrhiri8,35, P. Eugenio13, R. Fatemi38, G. Fedotov25, R. J. Feuerbach5, H. Funsten39, M. Garçon7, G. Gavalian26,29, G. P. Gilfoyle33, K. L. Giovanetti21, F. X. Girod7, J. T. Goetz3, E. Golovatch18,††, A. Gonenc12, R. W. Gothe34, K. A. Griffioen39, M. Guidal19, M. Guillo34, N. Guler29, L. Guo35, V. Gyurjyan35, C. Hadjidakis19, K. Hafidi1, R. S. Hakobyan6, J. Hardie8,35, D. Heddle8,35, F. W. Hersman26, K. Hicks28, I. Hleiqawi28, M. Holtrop26, M. Huertas34, C. E. Hyde-Wright29, Y. Ilieva14, D. G. Ireland15, B. S. Ishkhanov25, E. L. Isupov25, M. M. Ito35, D. Jenkins37, H. S. Jo19, K. Joo9, H. G. Juengst29, C. Keith35, J. D. Kellie15, M. Khandaker27, K. Y. Kim30, K. Kim22, W. Kim22, A. Klein29,‡‡, F. J. Klein6,12, M. Klusman31, M. Kossov20, L. H. Kramer12,35, V. Kubarovsky31, J. Kuhn5,31, S. V. Kuleshov20, J. Lachniet5,29, J. M. Laget7,35, J. Langheinrich34, D. Lawrence24, Ji Li31, A. C. S. Lima14, K. Livingston15, H. Lu34, K. Lukashin6, M. MacCormick19, J. J. Manak35, N. Markov9, S. McAleer13, B. McKinnon15, 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, L. Morand7, S. A. Morrow7,19, M. Moteabbed12, J. Mueller30, G. S. Mutchler32, P. Nadel-Turonski14, J. Napolitano31, R. Nasseripour12,34, S. Niccolai14,19, G. Niculescu21, I. Niculescu14,21, B. B. Niczyporuk35, M. R. Niroula29, R. A. Niyazov29,35, M. Nozar35, G. V. O'Rielly14, M. Osipenko18,25, A. I. Ostrovidov13, K. Park22, E. Pasyuk2, C. Paterson15, S. A. Philips14, J. Pierce38, N. Pivnyuk20, D. Pocanic38, O. Pogorelko20, E. Polli17, S. Pozdniakov20, B. M. Preedom34, J. W. Price4, D. Protopopescu15,26, L. M. Qin29, B. A. Raue12,35, G. Riccardi13, G. Ricco18, M. Ripani18, F. Ronchetti17, G. Rosner15, P. Rossi17, D. Rowntree23, P. D. Rubin33, F. Sabatié7,29, C. Salgado27, J. P. Santoro35,37,a, V. Sapunenko18,35, R. A. Schumacher5, V. S. Serov20, Y. G. Sharabian35, J. Shaw24, N. V. Shvedunov25, A. V. Skabelin23, E. S. Smith35, L. C. Smith38, D. I. Sober6, A. Stavinsky20, S. S. Stepanyan22, S. Stepanyan8,35,40, B. E. Stokes13, P. Stoler31, S. Strauch34, R. Suleiman23, M. Taiuti18, S. Taylor32, D. J. Tedeschi34, U. Thoma35,b, R. Thompson30, A. Tkabladze14, S. Tkachenko29, L. Todor5, C. Tur34, M. Ungaro9, M. F. Vineyard33,36, A. V. Vlassov20, L. B. Weinstein29, D. P. Weygand35, M. Williams5, E. Wolin35, M. H. Wood34,c, A. Yegneswaran35, J. Yun29, L. Zana26, J. Zhang29, B. Zhao9, and Z. Zhao34 (CLAS Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2Arizona State University, Tempe, Arizona 85287-1504, USA
3University of California at Los Angeles, Los Angeles, California 90095-1547, USA
4California State University, Dominguez Hills, Carson, California 90747, 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
10Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
11Fairfield University, Fairfield, Connecticut 06824, USA
12Florida International University, Miami, Florida 33199, USA
13Florida State University, Tallahassee, Florida 32306, USA
14The George Washington University, Washington, DC 20052, USA
15University of Glasgow, Glasgow G12 8QQ, United Kingdom
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, RU-117259 Moscow, Russia
21James Madison University, Harrisonburg, Virginia 22807, USA
22Kyungpook National University, Daegu 702-701, 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, RU-119899 Moscow, 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 25 July 2006; published 7 March 2007
New measurements of the spin structure functions of the proton and deuteron g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region (W<2 GeV), the data and QCD fits are in good agreement in both magnitude and Q2 dependence for Q2>1.7 GeV2/c2. This “global” duality appears to result from cancellations among the prominent “local” resonance regions: in particular strong σ3/2 contributions in the Δ(1232) region appear to be compensated by strong σ1/2 contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q2 than have been used previously.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.035203
DOI:
10.1103/PhysRevC.75.035203
PACS:
13.60.Hb, 25.30.Fj, 24.30.Gd
*Electronic address: bosted@jlab.org; corresponding author. †Current address: Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA. ‡Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA. §Deceased. **Current address: University of New Hampshire, Durham, New Hampshire 03824-3568, USA. ††Current address: Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia. ‡‡Current address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. aCurrent address: Catholic University of America, Washington, DC 20064, USA. bCurrent address: Physikalisches Institut der Universität Giessen, 35392 Giessen, Germany. cCurrent address: University of Massachusetts, Amherst, Massachusetts 01003, USA.
|
|
