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| VOLUME 82 | ISSUE 2 |
PAGE 57
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| An approach to NLO QCD analysis of the semi-inclusive DIS data with the modified Jacobi polynomial expansion method |
A. N. Sissakian, O. Yu. Shevchenko, O. N. Ivanov
Joint Institute for Nuclear Research, 141980 Dubna, Russia
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PACS: 13.60.Hb, 13.85.Ni, 13.88.+e
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Abstract
It is proposed the modification of the Jacobi polynomial expansion
method (MJEM) which is based on the application of the truncated moments
instead of the full ones. This allows to reconstruct with a high precision
the local quark helicity distributions even for the narrow accessible for
measurement Bjorken x region using as an input only four first moments
extracted from the data in next to leading order QCD. It is also proposed
the variational (extrapolation) procedure allowing to reconstruct the
distributions outside the accessible Bjorken x region using the
distributions obtained with MJEM in the accessible region. The numerical
calculations encourage one that the proposed variational (extrapolation)
procedure could be applied to estimate the full first (especially important)
quark moments.
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