Transverse Momentum of Sea and Valence Partons and Effect of Scaling Violation

概要

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The average transverse momentum of partons inside a hadron is investigated within the framework of two component covariant parton model. By reproducing the measured structure function from this model, the following features on the transverse momentum of the sea and valence parton are exhibited: The transverse momentum of the sea parton,<k_T(x)>_s, takes a value 〜400 MeV at x=0 and decreases rapidly as x increases. On the other hand, the transverse momentum of the valence parton,<k_T(x)>_v, is zero at x=0 and √<2>M<sime> 1.3GeV at x=1 where M is the mass of the target hadron (proton), which are the consequence independent of parameters involved in the model. The x dependence of the <k_T(x)>_v has the interesting property that it increases when x increases towards x=0.3〜0.4, peaks and subsequently decreases and reaches to √<2>M when x approaches 1. The effect of the model independent way, Further the transverse momentum, <q_T>, of the dilepton events is investigated on the basis of the Drell-Yan mechanism. It is suggested that the behaviour of the <q_T> depends strongly upon the Feynman variable x_F and M_<ii>/√<s> where M_<ii> is the mass of the dilepton and s the c.m. energy. Furthermore by the use of the naive parton model, the possibility is presented that R≡σ_L/σ_T increases in the small x region and decreases in the intermediate x region as q^2 increases.
理論物理学刊行会の論文
1978-01-25