Abstract
Leading-twist Bjorken polarised sum rule (BSR) Γ‾1p−n(Q2) is evaluated using its known renormalon structure. In addition, we add OPE terms with the dimension D=2,4, and fit this to experimental data for inelastic BSR in specific intervals of momenta, Q2≥Qmin2, where Qmin2≈(1.7±0.3)GeV2. Reasonable values of the pQCD coupling can be extracted only for specific choices of Qmin2, but have in general, for other choices of Qmin2, very large uncertainties and thus cannot be extracted in practice. On the other hand, if we fix the pQCD coupling to the known world average values, the D=2 and D=4 OPE terms can be determined within reasonable uncertainties dominated by the experimental uncertainties of the data.
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