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|Paper IPM / Particles And Accelerator / 15214||
The study of s−―s asymmetry is essential to better understand of
the structure of nucleon and also the perturbative and nonperturbative mechanisms for
sea quark generation. Actually, the nature and
dynamical origins of this asymmetry have always been an interesting subject to
research both experimentally and theoretically. One of the most powerful models can lead
to s−―s asymmetry is the meson-baryon model (MBM). In this work, using a
simplified configuration of this model suggested by Pumplin, we calculate the s−―s asymmetry for different values of cutoff parameter Λ, to study the dependence of model to this parameter and also to estimate the theoretical uncertainty imposed on the results due to its uncertainty. Then,
we study the evolution of distributions obtained both at next-to-leading order
(NLO) and next-to-next-to-leading order (NNLO) using different evolution schemes.
It is shown that the evolution of the intrinsic quark distributions from a low initial
scale, as suggested by Chang and Pang, is not a good choice at NNLO using variable flavor number scheme (VFNS).
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