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Mkrtchyan, H.; Bosted, P.E.; Adams, G.S.; Ahmidouch, A.; Angelescu, T.; 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.
Physics letters. B, 07/2008, Volume: 665, Issue: 1Journal Article
Cross sections for semi-inclusive electroproduction of charged pions (π±) from both proton and deuteron targets were measured for 0.2<x<0.5, 2<Q2<4 GeV2, 0.3<z<1, and Pt2<0.2 GeV2. For Pt<0.1 GeV, we find the azimuthal dependence to be small, as expected theoretically. For both π+ and π−, the Pt 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.
