Transverse momentum dependence of semi-inclusive pion production

H. Mkrtchyan , P.E. Bosted , G.S. Adams , A. Ahmidouch , T. Angelescu , J. Arrington , R. Asaturyan , O.K. Baker

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

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classification ✦ hep-ph

keywords dependencetransversedeuteronlargermomentumprotonquarkssemi-inclusive

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Cross sections for semi-inclusive electroproduction of charged pions ($\pi^{\pm}$) 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.

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Transverse momentum dependence of semi-inclusive pion production

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