Phys. Rev. Lett.
103,
202301
(2009)
[5 pages]
New Measurements of the European Muon Collaboration Effect in Very Light Nuclei
J. Seely et al.
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J. Seely1, A. Daniel2, D. Gaskell3, J. Arrington4,*, N. Fomin5, P. Solvignon4, R. Asaturyan6,†, F. Benmokhtar7, W. Boeglin8, B. Boillat9, P. Bosted3, A. Bruell3, M. H. S. Bukhari2, M. E. Christy10, B. Clasie1, S. Connell5,‡, M. M. Dalton5, D. Day5, J. Dunne11, D. Dutta11,12, L. El Fassi4, R. Ent3, H. Fenker3, B. W. Filippone13, H. Gao1,12, C. Hill5, R. J. Holt4, T. Horn7,3, E. Hungerford2, M. K. Jones3, J. Jourdan9, N. Kalantarians2, C. E. Keppel10, D. Kiselev9, M. Kotulla9, C. Lee14, A. F. Lung3, S. Malace10, D. G. Meekins3, T. Mertens9, H. Mkrtchyan6, T. Navasardyan6, G. Niculescu15, I. Niculescu15, H. Nomura16, Y. Okayasu2,16, A. K. Opper17, C. Perdrisat18, D. H. Potterveld4, V. Punjabi19, X. Qian12, P. E. Reimer4, J. Roche3, V. M. Rodriguez2, O. Rondon5, E. Schulte4, E. Segbefia10, K. Slifer5, G. R. Smith3, V. Tadevosyan6, S. Tajima5, L. Tang10, G. Testa9, R. Trojer9, V. Tvaskis10, W. F. Vulcan3, F. R. Wesselmann5, S. A. Wood3, J. Wright5, L. Yuan10, and X. Zheng4
1Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
2University of Houston, Houston, Texas, USA
3Thomas Jefferson National Laboratory, Newport News, Virginia, USA
4Physics Division, Argonne National Laboratory, Argonne, Illinois, USA
5University of Virginia, Charlottesville, Virginia, USA
6Yerevan Physics Institute, Yerevan, Armenia
7University of Maryland, College Park, Maryland, USA
8Florida International University, Miami, Florida, USA
9Basel University, Basel, Switzerland
10Hampton University, Hampton, Virginia, USA
11Mississippi State University, Jackson, Mississippi, USA
12Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina, USA
13Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California, USA
14University of the Witwatersrand, Johannesburg, South Africa
15James Madison University, Harrisonburg, Virginia, USA
16Tohoku University, Sendai, Japan
17Ohio University, Athens, Ohio, USA
18College of William and Mary, Williamsburg, Virginia, USA
19Norfolk State University, Norfolk, Virginia, USA
Received 28 April 2009; revised 27 July 2009; published 13 November 2009
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Physics
Focus
New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from 2H, 3He, 4He, 9Be and 12C for 0.3<x<0.9, Q2≈3–6 GeV2. These data represent the first measurement of the EMC effect for 3He at large x and a significant improvement for 4He. The data do not support previous A-dependent or density-dependent fits to the EMC effect and suggest that the nuclear dependence of the quark distributions may depend on the local nuclear environment.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.202301
DOI:
10.1103/PhysRevLett.103.202301
PACS:
13.60.Hb, 24.85.+p, 25.30.Fj
*Corresponding author: johna@anl.gov †Deceased ‡Present address: University of Johannesburg, Johannesburg, South Africa.
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