Polarized antiquark distributions from chiral quark-soliton model: summary of the results

In these short notes we present a parametrization of the results obtained in the chiral quark-soliton model for polarized antiquark distributions ∆ū, ∆d̄ and ∆s̄ at a low normalization point around μ = 0.6 GeV. The aim of these short notes is to summarize the results for the polarized antiquark distributions ∆ū, ∆d̄ and ∆s̄ obtained in refs. [1, 2, 3] in the framework of the chiral quark-soliton model. The chiral quark-soliton model [4] is a low-energy field theoretical model of the nucleon structure which allows a consistent calculations of leading twist quark and antiquark distributions [1]. Due to its field theoretical nature the quark and antiquark distributions obtained in this model satisfy all general QCD requirements: positivity, sum rules, inequalities, etc. A remarkable prediction of the chiral quark soliton model, noted first in ref. [1], is the strong flavour asymmetry of polarized antiquarks, the feature which is missing in other models like, for instance, pion cloud models (for discussion of this point see Ref. [5]). The fits below are based on the calculations of Refs. [1, 2, 3], generalized to the case of three flavours. The results of these calculations are fitted by the form inspired by quark counting rules discussed in Ref. [6]: