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Do we understand the single-spin asymmetry for \(\pi^0\) inclusive production in pp collisions?

  • theoretical physics
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Abstract.

The cross section data for \(\pi^0\) inclusive production in pp collisions is considered in a rather broad kinematic region in energy \(\sqrt{s}\), Feynman variable x F and transverse momentum p T. The analysis of these data is done in the perturbative QCD framework at the next-to-leading order. We find that they cannot be correctly described in the entire kinematic domain and this leads us to conclude that the single-spin asymmetry, A N for this process, observed several years ago at FNAL by the experiment E704 and the recent result obtained at BNL-RHIC by STAR, are two different phenomena.

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Authors and Affiliations

  1. Centre de Physique Théorique, UMR 6207, CNRS-Luminy Case 907, 13288, Marseille Cedex 9, France

    C. Bourrely & J. Soffer

Authors
  1. C. Bourrely
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  2. J. Soffer
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Additional information

Received: 10 March 2004, Revised: 19 May 2004, Published online: 14 July 2004

preprint CPT-2003/P.4581

(UMR 6207 is Unité Mixte de Recherche du CNRS and of Universités Aix-Marseille I and Aix-Marseille II and of Université du Sud Toulon-Var, Laboratoire affilié á la FRUMAM)

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Bourrely, C., Soffer, J. Do we understand the single-spin asymmetry for \(\pi^0\) inclusive production in pp collisions?. Eur. Phys. J. C 36, 371–374 (2004). https://doi.org/10.1140/epjc/s2004-01956-4

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  • DOI: https://doi.org/10.1140/epjc/s2004-01956-4

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