Abstract
Intrinsic (primordial) transverse momenta of quarks and gluons are calculated as well as those arising from recoil (bremsstrahlung) effects, using only the well-known parton distributions as input. The intrinsic k T's lie typically in the range of 150–250 MeV. Recent approaches using heuristic integro-differential equations for k T distributions of partons are shown to disagree with the results obtained by rigorous QCD calculations. The transverse momenta of dimuon pairs produced in pp → μ + μ − + X at the ISR can be solely explained by dynamical recoil effects, i.e., q q →(μ +μ −) g and gq→(μ +μ −) q , and no significant intrinsic transverse parton momenta are required. These dimuon transverse momenta show a pronounced energy dependence which could be easily tested at the CERN ISR. The only disagreement occurs for the average dimuon 〈 p T 2〉, but not for 〈 p T〉, observed in pN collisions. Possibilities to resolve this problem are discussed. Our results are also compared with previous theoretical analyses.
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