Phys. Rev. Lett.
104,
242301
(2010)
[6 pages]
Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q2=8.5 GeV2
A. J. R. Puckett et al.
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A. J. R. Puckett1,*, E. J. Brash2,3, M. K. Jones3, W. Luo4, M. Meziane5, L. Pentchev5, C. F. Perdrisat5, V. Punjabi6, F. R. Wesselmann6, A. Ahmidouch7, I. Albayrak8, K. A. Aniol9, J. Arrington10, A. Asaturyan11, H. Baghdasaryan12, F. Benmokhtar13, W. Bertozzi1, L. Bimbot14, P. Bosted3, W. Boeglin15, C. Butuceanu16, P. Carter2, S. Chernenko17, E. Christy8, M. Commisso12, J. C. Cornejo9, S. Covrig3, S. Danagoulian7, A. Daniel18, A. Davidenko19, D. Day12, S. Dhamija15, D. Dutta20, R. Ent3, S. Frullani21, H. Fenker3, E. Frlez12, F. Garibaldi21, D. Gaskell3, S. Gilad1, R. Gilman3,22, Y. Goncharenko19, K. Hafidi10, D. Hamilton23, D. W. Higinbotham3, W. Hinton6, T. Horn3, B. Hu4, J. Huang1, G. M. Huber16, E. Jensen2, C. Keppel8, M. Khandaker6, P. King18, D. Kirillov17, M. Kohl8, V. Kravtsov19, G. Kumbartzki22, Y. Li8, V. Mamyan12, D. J. Margaziotis9, A. Marsh2, Y. Matulenko19, J. Maxwell12, G. Mbianda24, D. Meekins3, Y. Melnik19, J. Miller25, A. Mkrtchyan11, H. Mkrtchyan11, B. Moffit1, O. Moreno9, J. Mulholland12, A. Narayan20, S. Nedev26, Nuruzzaman20, E. Piasetzky27, W. Pierce2, N. M. Piskunov17, Y. Prok2, R. D. Ransome22, D. S. Razin17, P. Reimer10, J. Reinhold15, O. Rondon12, M. Shabestari12, A. Shahinyan11, K. Shestermanov19,†, S. Širca28, I. Sitnik17, L. Smykov17,†, G. Smith3, L. Solovyev19, P. Solvignon10, R. Subedi12, E. Tomasi-Gustafsson14,29, A. Vasiliev19, M. Veilleux2, B. B. Wojtsekhowski3, S. Wood3, Z. Ye8, Y. Zanevsky17, X. Zhang4, Y. Zhang4, X. Zheng12, and L. Zhu1
1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Christopher Newport University, Newport News, Virginia 23606, USA
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
4Lanzhou University, Lanzhou 730000, Gansu, People’s Republic of China
5College of William and Mary, Williamsburg, Virginia 23187, USA
6Norfolk State University, Norfolk, Virginia 23504, USA
7North Carolina A&T State University, Greensboro, North Carolina 27411, USA
8Hampton University, Hampton, Virginia 23668, USA
9California State University Los Angeles, Los Angeles, California 90032, USA
10Argonne National Laboratory, Argonne, Illinois, 60439, USA
11Yerevan Physics Institute, Yerevan 375036, Armenia
12University of Virginia, Charlottesville, Virginia 22904, USA
13Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
14Institut de Physique Nucléaire, CNRS/IN2P3 and Université Paris-Sud, Orsay Cedex, France
15Florida International University, Miami, Florida 33199, USA
16University of Regina, Regina, Saskatchewan S4S OA2, Canada
17JINR-LHE, Dubna, Moscow Region, Russia 141980
18Ohio University, Athens, Ohio 45701
19IHEP, Protvino, Moscow Region, Russia 142284
20Mississippi State University, Starkville, Mississippi 39762, USA
21INFN, Sezione Sanità and Istituto Superiore di Sanità, 00161 Rome, Italy
22Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
23University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
24University of Witwatersrand, Johannesburg, South Africa
25University of Maryland, College Park, Maryland 20742, USA
26University of Chemical Technology and Metallurgy, Sofia, Bulgaria
27University of Tel Aviv, Tel Aviv, Israel
28University of Ljubljana, SI-1000 Ljubljana, Slovenia
29DSM, IRFU, SPhN, Saclay, 91191 Gif-sur-Yvette, France
Received 20 April 2010; published 18 June 2010
Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon’s quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements of the proton electromagnetic form factor ratio using the recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending the range of Q2 for which GEp is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the nonperturbative regime.
© 2010 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.242301
DOI:
10.1103/PhysRevLett.104.242301
PACS:
25.30.Bf, 13.40.Gp, 24.85.+p
*Corresponding author. puckett@jlab.org †Deceased.
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