The scale dependent nuclear effects in parton distributions for practical applications |
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Authors: | K.J. Eskola V.J. Kolhinen C.A. Salgado |
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Affiliation: | Department of Physics, University of Jyv?skyl?, P.O.Box 35, FIN-40351 Jyv?skyl?, Finland, FI Departamento de Física de Partículas, Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain, ES
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Abstract: | The scale dependence of the ratios of parton distributions in a proton of a nucleus A and in the free proton, , is studied within the framework of the lowest order leading-twist DGLAP evolution. By evolving the initial nuclear distributions obtained with the GRV-LO and CTEQ4L sets at a scale , we show that the ratios are only moderately sensitive to the choice of a specific modern set of free parton distributions. We propose that to a good first approximation, this parton distribution set-dependence of the nuclear ratios can be neglected in practical applications. With this result, we offer a numerical parametrization of for all parton flavours i in any , and at any and any for computing cross sections of hard processes in nuclear collisions. Received: 10 August 1998 / Published online: 27 April 1999 |
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