Phys. Rev. Lett.
99,
072501
(2007)
[5 pages]
Investigation of Proton-Proton Short-Range Correlations via the 12C(e,e′pp) Reaction
R. Shneor et al. Jefferson Lab Hall A Collaboration
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R. Shneor1, P. Monaghan2, R. Subedi3, B. D. Anderson3, K. Aniol4, J. Annand5, J. Arrington6, H. Benaoum7, F. Benmokhtar8, P. Bertin9, W. Bertozzi2, W. Boeglin10, J. P. Chen11, Seonho Choi12, E. Chudakov11, E. Cisbani13, B. Craver14, C. W. de Jager11, R. J. Feuerbach11, S. Frullani13, F. Garibaldi13, O. Gayou2, S. Gilad2, R. Gilman15,11, O. Glamazdin16, J. Gomez11, J.-O. Hansen11, D. W. Higinbotham11, T. Holmstrom17, H. Ibrahim18, R. Igarashi19, E. Jans20, X. Jiang15, Y. Jiang21, L. Kaufman22, A. Kelleher17, A. Kolarkar23, E. Kuchina15, G. Kumbartzki15, J. J. LeRose11, R. Lindgren14, N. Liyanage14, D. J. Margaziotis4, P. Markowitz10, S. Marrone13, M. Mazouz24, D. Meekins11, R. Michaels11, B. Moffit17, S. Nanda11, C. F. Perdrisat17, E. Piasetzky1, M. Potokar25, V. Punjabi26, Y. Qiang2, J. Reinhold10, B. Reitz11, G. Ron1, G. Rosner5, A. Saha11, B. Sawatzky14,27, A. Shahinyan28, S. Širca25,29, K. Slifer14,27, P. Solvignon27, V. Sulkosky17, N. Thompson5, P. E. Ulmer18, G. M. Urciuoli13, E. Voutier24, K. Wang14, J. W. Watson3, L. B. Weinstein18, B. Wojtsekhowski11, S. Wood11, H. Yao27, X. Zheng6,2, and L. Zhu30 (Jefferson Lab Hall A Collaboration)
1Tel Aviv University, Tel Aviv 69978, Israel
2Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
3Kent State University, Kent, Ohio 44242, USA
4California State University Los Angeles, Los Angeles, California 90032, USA
5University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
6Argonne National Laboratory, Argonne, Illinois 60439, USA
7Syracuse University, Syracuse, New York 13244, USA
8University of Maryland, College Park, Maryland 20742, USA
9Laboratoire de Physique Corpusculaire, F-63177 Aubière, France
10Florida International University, Miami, Florida 33199, USA
11Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
12Seoul National University, Seoul 151-747, South Korea
13INFN, Sezione Sanitá and Istituto Superiore di Sanitá, Laboratorio di Fisica, I-00161 Rome, Italy
14University of Virginia, Charlottesville, Virginia 22904, USA
15Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
16Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine
17College of William and Mary, Williamsburg, Virginia 23187, USA
18Old Dominion University, Norfolk, Virginia 23508, USA
19University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
20Nationaal Instituut voor Kernfysica en Hoge-Energiefysica, Amsterdam, The Netherlands
21University of Science and Technology of China, Hefei, Anhui, China
22University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
23University of Kentucky, Lexington, Kentucky 40506, USA
24Laboratoire de Physique Subatomique et de Cosmologie, 38026 Grenoble, France
25Institute “Jožef Stefan,” 1000 Ljubljana, Slovenia
26Norfolk State University, Norfolk, Virginia 23504, USA
27Temple University, Philadelphia, Pennsylvania 19122, USA
28Yerevan Physics Institute, Yerevan 375036, Armenia
29Department of Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
30University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Received 14 March 2007; published 17 August 2007
We investigated simultaneously the 12C(e,e′p) and 12C(e,e′pp) reactions at Q2=2 (GeV/c)2, xB=1.2, and in an (e, e′p) missing-momentum range from 300 to 600 MeV/c. At these kinematics, with a missing momentum greater than the Fermi momentum of nucleons in a nucleus and far from the delta excitation, short-range nucleon-nucleon correlations are predicted to dominate the reaction. For (9.5±2)% of the 12C(e,e′p) events, a recoiling partner proton was observed back-to-back to the 12C(e,e′p) missing-momentum vector, an experimental signature of correlations.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.072501
DOI:
10.1103/PhysRevLett.99.072501
PACS:
21.30.Fe, 21.60.−n, 24.10.−i, 25.30.−c
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