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Prog. Theor. Phys. Vol. 59 No. 1 (1978) pp. 184-198

[ Full Text PDF : FREE ACCESS (1254K) ]

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

Tetsuji Kawabe

Department of Physics, Kyushu University 33, Fukuoka 812

(Received August 11, 1977)

Abstract:

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, <kT(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, <kT(x)>v, is zero at x = 0 and √2M ≃1.3 GeV 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 <kT(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 √2M when x approaches 1. The effect of the scaling violation on the <kT(x)>i, i = s and v, is also taken into account as possible as in the model independent way. Further the transverse momentum, <qT>, of the dilepton events is investigated on the basis of the Drell-Yan mechanism. It is suggested that the behaviour of the <qT> depends strongly upon the Feynman variable xF and Mll/√s where Mll 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 ≡σL/σT increases in the small x region and decreases in the intermediate x region as q2 increases.


URL : http://ptp.ipap.jp/link?PTP/59/184/
DOI : 10.1143/PTP.59.184

[ Full Text PDF : FREE ACCESS (1254K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 60 No. 6 (1978) pp. 1824-1833 :
    Hadron Mass Corrections and Parton Transverse Momentum in Hadronic µ-Pair Production
    Kuni Harada, Toshiaki Kaneko, Norisuke Sakai and Osamu Sawada
  2. Progress of Theoretical Physics Vol. 61 No. 3 (1979) pp. 928-941 :
    Vortex String Picture and Large pT Reactions
    Masahiro Imachi, Tetsuji Kawabe, Shoichiro Otsuki and Hiroshi Yoneyama
  3. Progress of Theoretical Physics Vol. 62 No. 2 (1979) pp. 475-489 :
    Effects of Off-Shell Partons on R=σL/σT and Primordial Transverse Momentum
    Sumio Wada

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