Phys. Rev. C
78,
058201
(2008)
[4 pages]
Scaling study of the pion electroproduction cross sections
T. Horn et al.
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T. Horn1, X. Qian2, J. Arrington3, R. Asaturyan4, F. Benmokthar5, W. Boeglin6, P. Bosted1, A. Bruell1, M. E. Christy7, E. Chudakov1, B. Clasie8, M. M. Dalton9, A. Daniel10, D. Day11, D. Dutta12, L. El Fassi3, R. Ent1, H. Fenker1, J. Ferrer13, N. Fomin11, H. Gao2, K. Garrow14, D. Gaskell1, C. Gray9, G. M. Huber15, M. K. Jones1, N. Kalantarians16, C. E. Keppel1,7, K. Kramer2, Y. Li16, Y. Liang17, A. F. Lung1, S. Malace7, P. Markowitz6, A. Matsumura18, D. Meekins1, T. Mertens19, T. Miyoshi18, H. Mkrtchyan4, R. Monson20, T. Navasardyan4, G. Niculescu13, I. Niculescu13, Y. Okayasu18, A. K. Opper21, C. Perdrisat22, V. Punjabi23, A. W. Rauf24, V. Rodriguez16, D. Rohe19, J. Seely8, E. Segbefia7, G. R. Smith1, M. Sumihama18, V. Tadevosyan4, L. G. Tang1,7, V. Tvaskis25, A. Villano26, W. Vulcan1, F. R. Wesselmann23, S. A. Wood1, L. Yuan7, and X. C. Zheng3
1Physics Division, TJNAF, Newport News, Virginia 23606, USA
2Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
3Argonne National Laboratory, Argonne, Illinois 60439, USA
4Yerevan Physics Institute, 375036 Yerevan, Armenia
5University of Maryland, College Park, Maryland 20742, USA
6Florida International University, Miami, Florida 33119, USA
7Hampton University, Hampton, Virginia 23668, USA
8Massachussets Institute of Technology, Cambridge, Massachusetts 02139, USA
9University of the Witwatersrand, Johannesburg, South Africa
10University of Houston, Houston, Texas 77204, USA
11University of Virginia, Charlottesville, Virginia 22904, USA
12Mississippi State University, Mississippi State, Mississippi 39762, USA
13James Madison University, Harrisonburg, Virginia 22807, USA
14TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada
15University of Regina, Regina, Saskatchewan S4S 0A2, Canada
16University of Houston, Houston, Texas 77204, USA
17The American University, Washington, District of Columbia 20016, USA
18Tohoku University, Sendai, Japan
19Basel University, Basel, Switzerland
20Central Michigan University, Mount Pleasant, Michigan 48859, USA
21Ohio University, Athens, Ohio 45071, USA
22College of William and Mary, Williamsburg, Virginia 23187, USA
23Norfolk State University, Norfolk, Virginia, USA
24University of Manitoba, Winnipeg, Manitoba, R3T-2N2, Canada
25Faculteit Natuur-en Sterrenkunde, Vrije Universiteit, NL-1081 HV Amsterdam, The Netherlands
26Rensselaer Polytechnic Institute, Troy, New York 12180, USA
Received 12 July 2007; revised 9 May 2008; published 18 November 2008
The 1H(e, e'π+)n cross section was measured for arange of four-momentum transfer up to Q2=3.91 GeV2 at values of the invariant mass W above the resonance region. The Q2 dependence of the longitudinal component was found to be consistent with the Q2-scaling prediction for hard exclusive processes. This suggests that the QCD factorization theorem is applicable at rather low values of Q2. The transverse term falls off slower than the naive Q-8 expectation and remains appreciable even at Q2=3.91 GeV2.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.058201
DOI:
10.1103/PhysRevC.78.058201
PACS:
14.40.Aq, 25.30.Rw, 11.55.Jy, 13.40.Gp
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