Some Consequences of a Modified Kuti-Weisskopf Quark-Parton Model

Abstract

emerging leptons produced via a n exchange of a ACKNOWLEDGMENT single photon (based on the parton model) is given in the l a s t paper [Eq. (35)] of Ref. 7 and may b e of I a m sincerely grateful to Professor Norman s o m e use. Christ f o r his sponsorship of this problem. *This research was supported by the U. S. Atomic Energy Commission. IF. Ehlotzky and H. Mitter, Nuovo Cimento g, 181 (1968), and references therein. his is to acknowledge the help of Professor L. M. Lederman in carrying out a similar calculation on radiative corrections to the decay of an indefinitemetric photon (unpublished). 3~. Christenson et a l . , Phys. Rev. Lett. 25, 1523 (1970). 4~h a t is, E = E , +. . . contributions from higher-order radiative corrections to the lepton-pair production cross section. 5~. D. Bjorken and E. A. Paschos, Phys. Rev. 2, 1975 (1969). %. D. Drell and T.-M. Yan, Phys. Rev. Lett. 25, 316 (1970). 7~. Fujikawa, Nuovo Cimento E, 83 (1972), E, 117 (1972) ; V. M. Budnev et a1 . , Phys. Lett. x, 526 (1972); A. Soni, Phys. Rev. D 8, 880 (1973). 8~2 u is computed in the last paper of Ref. 7.We attempt to modify the Kuti-Weisskopf quark-parton model s o as to obtain agreement with recent experimental and theoretical results. We find that, at the cost of sacrificing some simplicity, reasonable phenomenological fits can be obtained.

A determination of parton distributions with faithful uncertainty estimation

“…At a very early stage [1][2][3][4][5][6], parton distributions were determined through a combination of general physical principles (as embodied in sum rules), model assumptions and the first crude experimental information coming from Bjorken scaling and its violation. These determinations were semi-quantitative at best, and they were aimed at showing the compatibility of the data with the partonic interpretation of hard processes.…”

“…Accumulated knowledge eventually led to parton sets (such as as the CTEQ5 [21] and MRST2001 [22] sets) very likely to have an accuracy comparable to that of next-to-leading order QCD computation, adequate for the determination of most hard processes at collider energies. These parton sets differ in many technical details, but are rooted in a similar approach: a parton parametrization is assumed, based on the functional form f (x) ∼ x α (1 − x) β (used since the earliest investigations [1]), and its parameters are then tuned so that the various computed observables fit the experimental data.…”

Progress in the Determination of the Partonic Structure of the Proton

“…At a very early stage [3][4][5][6][7][8][9], parton distributions were determined through a combination of model assumptions and the first experimental results on deep-inelastic electron-nucleon scattering (DIS). These determinations were semi-quantitative at best, and they were aimed at showing the compatibility of the data with the partonic interpretation of hard processes.…”

Discussion of Vector Meson Production in Kp Interactions in Terms of a Simple Quark Fusion Model

“…[9], in order to account for the conversion of gluons into qq pairs. The factor iZ = 0.43 is introduced to take into account the suppression of strange sea quark pair production [4].…”

“…For the valence quark distribution inside the proton, parametrizations used for the description of deep inelmtic scattering are taken [9]:…”