Power corrections in the longitudinal and transverse structure functions of proton and deuteron

Details Power corrections in the longitudinal and transverse structure functions of proton and deuteron Power corrections in the longitudinal and transverse structure functions of proton and deuteron

1999-01-20

arxiv.org/abs/hep-ph/9901360v2

Nucl.Phys. B555 (1999) 306-334

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version with only minor changes, to appear in Nuclear Physics B

Scientific paper

10.1016/S0550-3213(99)00302-8

Power corrections to the Q**2 behaviour of the low-order moments of both the longitudinal and transverse structure functions of proton and deuteron have been investigated using available phenomenological fits of existing data in the Q**2 range between 1 and 20 (GeV/c)**2. The Natchmann definition of the moments has been adopted for disentangling properly target-mass and dynamical higher-twist effects in the data. The leading twist has been treated at next-to-leading order in the strong coupling constant and the effects of higher orders of the perturbative series have been estimated using a renormalon-inspired model. The contributions of (target-dependent) multiparton correlations to both 1/Q**2 and 1/Q**4 power terms have been determined in the transverse channel, while the longitudinal one appears to be consistent with a pure infrared renormalon picture in the whole Q**2-range between 1 and 20 (GeV/c)**2. Finally, the extracted twist-2 contribution in the deuteron turns out to be compatible with the hypothesis of an enhanced d-quark parton distribution at large x.

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