Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-10-19
Phys.Rev. D51 (1995) 6036-6051
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages plus 13 pages with figures, requires epsf.sty, revised version to appear in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.51.6036
We argue that parton distributions in coordinate space provide a more natural object for nonperturbative methods compared to the usual momentum distributions in which the physics of different longitudinal distances is being mixed. To illustrate the advantages of the coordinate space formulation, we calculate the coordinate space distributions for valence quarks in the proton using the QCD sum rule approach. A remarkable agreement is found between the calculated and the experimentally measured u-quark distribution up to light-cone distances $\Delta^- = \Delta^0 - \Delta^3$ of order $\sim 1$ fm in the proton rest frame. The calculation for valence d quarks gives much worse results; the reasons for this discrepancy are discussed.
Braun Volker
Gornicki Pawel
Mankiewicz Lech
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