Abstract
The gluon and sea distributions of the pion are uniquely determined by the requirement of avalence-like structure of the input parton distributions at some low resolution scale. These (dynamical) results are obtained with practically no free parameters, just using the experimentally determined pionic valence distribution combined with the constraints for the pionic gluon distribution provided by direct-γ data. Simple parametrizations of the resulting parton distributions are presented in the range 10−5≲x<1 and 0.3≲Q 2≲108 GeV2 as obtained from the leading-and higher-order evolution equations.
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Glück, M., Reya, E. & Vogt, A. Pionic parton distributions. Z. Phys. C - Particles and Fields 53, 651–655 (1992). https://doi.org/10.1007/BF01559743
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DOI: https://doi.org/10.1007/BF01559743