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Abstract: We propose a new method to determine at what transverse momenta particleproduction in high-energy pp collisions is governed by hard parton-partonprocesses. Using information on the transverse spatial distribution of partonsobtained from hard exclusive processes in ep-gamma p scattering, we evaluatethe impact parameter distribution of pp collisions with a hard parton-partonprocess as a function of p T of the produced parton jet. We find that theaverage pp impact parameters in such events depend very weakly on p T in therange 2 < p T < few 100 GeV, while they are much smaller than those inminimum-bias inelastic collisions. The impact parameters in turn govern theobservable transverse multiplicity in such events in the directionperpendicular to the trigger particle or jet. Measuring the transversemultiplicity as a function of p T thus provides an effective tool fordetermining the minimum p T for which a given trigger particle originates froma hard parton-parton process. Additional tests of the proposed geometriccorrelations are possible by measuring the dependence on the trigger rapidity.Various strategies for implementing this method are outlined.



Autor: L. Frankfurt, M. Strikman, C. Weiss

Fuente: https://arxiv.org/







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