Possible parametrization of parton distributions incorporating singular smallx behaviour implied by QCD and its phenomenological implications for HERA |
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Authors: | J Kwiecinski D Strozik-Kotlorz |
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Institution: | 1. Department of Theoretical Physics, H. Niewodniczanski Institute of Nuclear Physics, ul. Radzikowskiego 152, PL-31-342, Krakow, Poland
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Abstract: | The gluon and quark distributions of the nucleon are evaluated using the Altarelli-Parisi equations with the input distributions atQ 0 2 =5 GeV2 for seaquarks and gluons modified by the factor (ax ?0.5+b). The new parametrization is constrained to satisfy the momentum sum rule and after backward evolution (fromQ 0 2 =5 GeV2 toQ 2=1 GeV2) it is also constrained to give approximately 1/x behaviour of the sea-quark and gluon distributions in the limited region of smallx (10?3<x<10?2 or so). The theoretical predictions relevant for HERA for structure functionsF 2(x, Q 2) andF L (x, Q 2) in the region of very smallx(10?4<x<10?2) and largeQ 2 and for the cross-sectionσ(γ* p→ΨX) are presented. Distributions of heavy quarks (c,b,t) are also discussed. |
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