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arXiv · 0904.4448

New measurements of the EMC effect in very light nuclei

J. Seely·A. Daniel·D. Gaskell·J. Arrington·N. Fomin·P. Solvignon·R. Asaturyan·F. Benmokhtar·W. Boeglin·B. Boillat·P. Bosted·A. Bruell·M. H. S. Bukhari·M. E. Christy·B. Clasie·S. Connell·M. Dalton·D. Day·J. Dunne·D. Dutta·L. El Fassi·R. Ent·H. Fenker·B. W. Filippone·H. Gao·C. Hill·R. J. Holt·T. Horn·E. Hungerford·M. K. Jones·J. Jourdan·N. Kalantarians·C. E. Keppel·D. Kiselev·M. Kotulla·C. Lee·A. F. Lung·S. Malace·D. G. Meekins·T. Mertens·H. Mkrtchyan·T. Navasardyan·G. Niculescu·I. Niculescu·H. Nomura·Y. Okayasu·A. K. Opper·C. Perdrisat·D. H. Potterveld·V. Punjabi·X. Qian·P. E. Reimer·J. Roche·V. M. Rodriguez·O. Rondon·E. Schulte·E. Segbefia·K. Slifer·G. R. Smith·V. Tadevosyan·S. Tajima·L. Tang·G. Testa·R. Trojer·V. Tvaskis·W. F. Vulcan·F. R. Wesselmann·S. A. Wood·J. Wright·L. Yuan·X. Zheng
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Abstract

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, Q^2 approximately 3-6 GeV^2. 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.

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J. Seely, A. Daniel, D. Gaskell, J. Arrington, N. Fomin, P. Solvignon, R. Asaturyan, F. Benmokhtar, W. Boeglin, B. Boillat, P. Bosted, A. Bruell, M. H. S. Bukhari, M. E. Christy, B. Clasie, S. Connell, M. Dalton, D. Day, J. Dunne, D. Dutta, L. El Fassi, R. Ent, H. Fenker, B. W. Filippone, H. Gao, C. Hill, R. J. Holt, T. Horn, E. Hungerford, M. K. Jones, J. Jourdan, N. Kalantarians, C. E. Keppel, D. Kiselev, M. Kotulla, C. Lee, A. F. Lung, S. Malace, D. G. Meekins, T. Mertens, H. Mkrtchyan, T. Navasardyan, G. Niculescu, I. Niculescu, H. Nomura, Y. Okayasu, A. K. Opper, C. Perdrisat, D. H. Potterveld, V. Punjabi, X. Qian, P. E. Reimer, J. Roche, V. M. Rodriguez, O. Rondon, E. Schulte, E. Segbefia, K. Slifer, G. R. Smith, V. Tadevosyan, S. Tajima, L. Tang, G. Testa, R. Trojer, V. Tvaskis, W. F. Vulcan, F. R. Wesselmann, S. A. Wood, J. Wright, L. Yuan, X. Zheng. 2009-10-27. New measurements of the EMC effect in very light nuclei. https://doi.org/10.1103/physrevlett.103.202301

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