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Transverse momentum dependence of semi-inclusive pion production RID E-5803-2011

Author:
Mkrtchyan, H.  Bosted, P. E.  Adams, G. S.  Ahmidouch, A.  Angelescu, I.  Arrington, J.  Asaturyan, R.  Baker, O. K.  Benmouna, N.  Bertoncini, C.  Blok, H. P.  Boeglin, W. U.  Breuer, H.  Christy, M. E.  Connell, S. H.  Cui, Y.  Dalton, M. M.  Danagoulian, S.  Day, D.  Dodario, T.  Dunne, J. A.  Dutta, D.  El Khayari, N.  Ent, R.  Fenker, H. C.  Frolov, V. V.  Gan, L.  Gaskell, D.  Hafidi, K.  Hinton, W.  Holt, R. J.  Horn, T.  Huber, G. M.  Hungerford, E.  Jiang, X.  Jones, M.  Joo, K.  Kalantarians, N.  Kelly, J. J.  Keppel, C. E.  Kubarovsky, V.  Li, Y.  Liang, Y.  Malace, S.  Markowitz, P.  McGrath, E.  McKee, P.  Meekins, D. G.  Moziak, B.  Navasardyan, T.  Niculescu, G.  Niculescu, I.  Opper, A. K.  Ostapenko, T.  Reimer, P. E.  Reinhold, J.  Roche, J.  Rock, S. E.  Schulte, E.  Segbefia, E.  Smith, C.  Smith, G. R.  Stoler, P.  Tadevosyan, V.  Tang, L.  Ungaro, M.  Uzzle, A.  Vidakovic, S.  Villano, A.  Vulcan, W. F.  Wang, M.  Warren, G.  Wesselmann, F.  Wojtsekhowski, B.  Wood, S. A.  Xu, C.  Yuan, L.  Zheng, X.  Zhu, H.  


Journal:
PHYSICS LETTERS B


Issue Date:
2008


Abstract(summary):

Cross sections for semi-inclusive electroproduction of charged pions (pi(+/-)) from both proton and deuteron targets were measured for 0.2 < x < 0.5, 2 < Q(2) < 4 GeV(2), 0.3 < z < 1, and P(t)(2) < 0.2 GeV(2). For P(t) < 0.1 GeV, we find the azimuthal dependence to be small, as expected theoretically. For both pi(+) and pi(-), the P(t) dependence from the deuteron is found to be slightly weaker than from the proton. In the context of a simple model, this implies that the initial transverse momenta width of d quarks is larger than for u quarks and, contrary to expectations, the transverse momentum width of the favored fragmentation function is larger than the unfavored one. (C) 2008 Elsevier B.V. All rights reserved.


Page:
20---25


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