Pion and Kaon Production in Nucleon - Nucleon Collisions

Physics – Nuclear Physics – Nuclear Theory

Scientific paper

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a talk presented by Marta Tichoruk at the international conference MESON2006, Cracow, June 2006, 5 pages, 3 figures

Scientific paper

Inclusive cross section for pion production in proton - proton collisions are calculated based on unintegrated parton distribution functions (uPDFs). In addition to purely gluonic terms the present approach includes also quark degrees of freedom. Phenomenological fragmentation functions from the literature are used. The new mechanisms are responsible for $\pi^+$ - $\pi^-$ asymmetry. In contrast to standard collinear approach, application of 2 $\to$ 1 $k_t$ - factorization approach can be extended towards much lower transverse momenta, both at mid and forward rapidity region. The results of the calculation are compared with SPS and RHIC data.

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