Deep inelastic scattering and forward ${\pi}^{o}$ production at NLO

Aurenche, P and Basu, Rahul and Fontannaz, M and Godbole, RM (2005) Deep inelastic scattering and forward ${\pi}^{o}$ production at NLO. In: The European Physical Journal C - Particles and Fields, 42 (1). pp. 43-52.

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Abstract

We present a detailed phenomenological study of forward hadron (pi(0)) production in deep inelastic scattering, with both the direct and the resolved contributions calculated to NLO accuracy. A comparison of the theoretical predictions for the various distributions with the H1 data and a study of the stability of the QCD predictions under changes of scales is the focus of this study. We obtain a very good overall description of the recent H1 data with the choice of scale Q(2) + E-perpendicular to(2), in contrast to the ( Q(2) + E-perpendicular to(2))/2 required earlier when the resolved contribution was included only at LO accuracy. We find a more modest variation of the predictions, as the scale is changed from ( Q(2) + E-perpendicular to(2))/2 to 2( Q(2) + E-perpendicular to(2)), as compared to the case where the resolved contribution was included only at LO accuracy. This variation is of the order of the rather large experimental errors. Unfortunately, this fact prevents us from concluding that perturbation theory gives an unambiguous prediction for forward particle production in deep inelastic scattering. However, the overall success of perturbative QCD in explaining the small x(Bj) data means that perhaps a full resummation of the BFKL ladder is not called for. We notice the need for rather large resolved contributions to explain the data at low x(Bj) even at somewhat larger Q(2) values.

Item Type: Journal Article Copyright of this article belongs to Springer-Verlag. Division of Physical & Mathematical Sciences > Centre for High Energy Physics 05 Mar 2009 09:54 19 Sep 2010 04:54 http://eprints.iisc.ernet.in/id/eprint/16914