Eur. Phys. J. C (2007) 51: 859-866
https://doi.org/10.1140/epjc/s10052-007-0353-0

Regular Article - Theoretical Physics

Perturbative Q²-power corrections to the structure function g₁

¹ Ioffe Physico-Technical Institute, 194021, St. Petersburg, Russia
² Dipartimento di Fisica and INFN, Via della Vasca Navale 84, 00146, Roma , Italy
³ St. Petersburg Institute of Nuclear Physics, 188300, Gatchina, Russia

^* e-mail: mario.greco@roma3.infn.it

Received: 2 April 2007
Published online: 1 August 2007

Abstract

We show that (∼1/(Q²)^k) power corrections to the spin structure function g₁ at small x are generated perturbatively from the regulated infrared divergencies. We present the explicit series of such terms as well as the formulae for their resummation. These contributions are not included in the standard analysis of the experimental data. We argue that accounting for such terms can sizably change the impact of the power corrections conventionally attributed to the higher twists.