Phys. Rev. C 80, 035207 (2009) [29 pages]
Applications of quark-hadron duality in the F2 structure function
Abstract
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S. P. Malace, 1,2 G. S. Adams, 3 A. Ahmidouch, 4 T. Angelescu, 5 J. Arrington, 6 R. Asaturyan, 7 O. K. Baker, 1,8 N. Benmouna, 9 H. P. Blok, 10 W. U. Boeglin, 11 P. E. Bosted, 8 H. Breuer, 12 M. E. Christy, 1 Y. Cui, 13 M. M. Dalton, 14 S. Danagoulian, 4 D. Day, 15 J. A. Dunne, 16 D. Dutta, 16 R. Ent, 1,8 H. C. Fenker, 8 L. Gan, 17 D. Gaskell, 8 K. Hafidi, 6 W. Hinton, 1 R. J. Holt, 6 T. Horn, 12 G. M. Huber, 18 E. Hungerford, 13 X. Jiang, 19 M. Jones, 8 K. Joo, 20 N. Kalantarians, 13 J. J. Kelly, 12 C. E. Keppel, 1,8 E. R. Kinney, 21 V. Kubarovsky, 8 Y. Li, 13 Y. Liang, 22 P. Markowitz, 11 E. McGrath, 23 P. McKee, 15 D. G. Meekins, 8 H. Mkrtchyan, 7 T. Navasardyan, 7 G. Niculescu, 22,23 I. Niculescu, 23 P. E. Reimer, 6 J. Reinhold, 11 J. Roche, 8 E. Schulte, 6 E. Segbefia, 1 C. Smith, 15 G. R. Smith, 8 V. Tadevosyan, 7 L. Tang, 1,8 M. Ungaro, 20 A. Uzzle, 1 S. Vidakovic, 18 A. N. Villano, 3 W. F. Vulcan, 8 F. R. Wesselmann, 15 B. Wojtsekhowski, 8 S. A. Wood, 8 L. Yuan, 1 and X. Zheng61Hampton University, Hampton, Virginia 23668, USA
2University of South Carolina, Columbia, South Carolina 29208, USA
3Rensselaer Polytechnic Institute, Troy, New York 12180, USA
4North Carolina A&T State University, Greensboro, North Carolina 27411, USA
5Bucharest University, Bucharest, Romania
6Physics Division, Argonne National Laboratory, Argonne, Illinois 60565, USA
7Yerevan Physics Institute, Yerevan, Armenia
8Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
9The George Washington University, Washington, D.C. 20052, USA
10Department of Physics, VU-university, 1081 HV, Amsterdam, The Netherlands
11Florida International University, University Park, Florida 33199, USA
12University of Maryland, College Park, Maryland 20742, USA
13University of Houston, Houston, Texas 77204, USA
14University of the Witwatersrand, Johannesburg, South Africa
15University of Virginia, Charlottesville, Virginia 22901, USA
16Mississippi State University, Mississippi State, Mississippi 39762, USA
17University of North Carolina Wilmington, Wilmington, North Carolina 28403, USA
18University of Regina, Regina, Saskatchewan, Canada S4S 0A2
19Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
20University of Connecticut, Storrs, Connecticut 06269, USA
21University of Colorado, Boulder, Colorado 80309, USA
22Ohio University, Athens, Ohio 45071, USA
23James Madison University, Harrisonburg, Virginia 22807, USA
Received 2 June 2009; published 30 September 2009
Inclusive electron-proton and electron-deuteron inelastic cross sections have been measured at Jefferson Lab (JLab) in the resonance region, at large Bjorken x, up to 0.92, and four-momentum transfer squared Q2 up to 7.5 GeV2 in the experiment E00-116. These measurements are used to extend to larger x and Q2 precision, quantitative, studies of the phenomenon of quark-hadron duality. Our analysis confirms, both globally and locally, the apparent “violation” of quark-hadron duality previously observed at a Q2 of 3.5 GeV2 when resonance data are compared to structure function data created from CTEQ6M and MRST2004 parton distribution functions (PDFs). More importantly, our new data show that this discrepancy saturates by Q2~4 GeV2, becoming Q2 independent. This suggests only small violations of Q2 evolution by contributions from the higher-twist terms in the resonance region that is confirmed by our comparisons to ALEKHIN and ALLM97. We conclude that the unconstrained strength of the CTEQ6M and MRST2004 PDFs at large x is the major source of the disagreement between data and these parametrizations in the kinematic regime we study and that, in view of quark-hadron duality, properly averaged resonance region data could be used in global quantum chromodynamics fits to reduce PDF uncertainties at large x.
©2009 The American Physical Society
| URL: |
http://link.aps.org/doi/10.1103/PhysRevC.80.035207
|
| DOI: |
10.1103/PhysRevC.80.035207 |
| PACS: |
25.30.Fj;
24.85.+p
|
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