Phys. Rev. Lett.
86,
1713–1716
(2001)
Measurement of the Charged Pion Electromagnetic Form Factor
J. Volmer et al. (The Jefferson Lab Fπ Collaboration)
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J. Volmer11,21, D. Abbott19, H. Anklin4,19, C. Armstrong2, J. Arrington1, K. Assamagan5, S. Avery5, O. K. Baker5,19, H. P. Blok11,21, C. Bochna6, E. J. Brash16, H. Breuer8, N. Chant8, J. Dunne19, T. Eden12,19, R. Ent19, D. Gaskell14, R. Gilman17,19, K. Gustafsson8, W. Hinton5, G. M. Huber16, H. Jackson1, M. K. Jones2, C. Keppel5,19, P. H. Kim7, W. Kim7, A. Klein13, D. Koltenuk15, M. Liang19, G. J. Lolos16, A. Lung19, D. J. Mack19, D. McKee10, D. Meekins2, J. Mitchell19, H. Mkrtchyan22, B. Mueller1, G. Niculescu5, I. Niculescu5, D. Pitz18, D. Potterveld1, L. M. Qin13, J. Reinhold1, I. K. Shin7, S. Stepanyan22, V. Tadevosyan22, L. G. Tang5,19, R. L. J. van der Meer16,19, K. Vansyoc13, D. Van Westrum3, W. Vulcan19, S. Wood19, C. Yan19, W.-X. Zhao9, and B. Zihlmann19,20 (The Jefferson Lab Fπ Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439 2College of William and Mary, Williamsburg, Virginia 23187 3University of Colorado, Boulder, Colorado 76543 4Florida International University, Miami, Florida 33119 5Hampton University, Hampton, Virginia 23668 6University of Illinois, Champaign, Illinois 61801 7Kyungpook National University, Taegu, Korea 8University of Maryland, College Park, Maryland 20742 9M.I.T.–Laboratory for Nuclear Sciences and Department of Physics, Cambridge, Massachussetts 02139 10New Mexico State University, Las Cruces, New Mexico 88003-8001 11NIKHEF, Postbus 41882, NL-1009 DB Amsterdam, The Netherlands 12Norfolk State University, Norfolk, Virginia 23504 13Old Dominion University, Norfolk, Virginia 23529 14Oregon State University, Corvallis, Oregon 97331 15University of Pennsylvania, Philadelphia, Pennsylvania 19104 16University of Regina, Regina, Saskatchewan S4S-0A2, Canada 17Rutgers University, Piscataway, New Jersey 08855 18DAPNIA/SPhN, CEA/Saclay, F-91191 Gif-sur-Yvette, France 19Physics Division, TJNAF, Newport News, Virginia 23606 20University of Virginia, Charlottesville, Virginia 22901 21Faculteit Natuur- en Sterrenkunde, Vrije Universiteit, NL-1081 HV Amsterdam, The Netherlands 22Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 17 October 2000; published in the issue dated 26 February 2001
Separated longitudinal and transverse structure functions for the reaction 1H(e,e′π+)n were measured in the momentum transfer region Q2 = 0.6–1.6(GeV/c)2 at a value of the invariant mass W = 1.95GeV. New values for the pion charge form factor were extracted from the longitudinal cross section by using a recently developed Regge model. The results indicate that the pion form factor in this region is larger than previously assumed and is consistent with a monopole parametrization fitted to very low Q2 elastic data.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.1713
DOI:
10.1103/PhysRevLett.86.1713
PACS:
14.40.Aq, 11.55.Jy, 13.40.Gp, 25.30.Rw
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