Higher Twist Effects in Proton-Proton Collisions

Abstract

In this article, we investigate the contribution of the high twist Feynman diagrams to the large-$p_T$ pion production cross section in proton-proton collisions and we present the general formulae for the high and leading twist differential cross sections. The pion wave function where two non-trivial Gegenbauer coefficients $a_2$ and $a_4$ have been extracted from the CLEO data, two other pion model wave functions, $P_2$, $P_3$, the asymptotic and the Chernyak-Zhitnitsky wave functions are used in the calculations. The results of all the calculations reveal that the high twist cross sections, the ratios $R$, $r$, the dependence transverse momentum $p_T$ and the rapidity $y$ of pion in the ${\Phi }_{CLEO}(x,Q^2)$ wave function case is very close to the ${\Phi }_{asy}(x)$ asymptotic wave function case. It is shown that the high twist contribution to the cross section depends on the choice of the meson wave functions.

28 pages 18 figures RevTex4

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• Fragmentation Functions for Pions, Kaons, and Protons at Next-to-Leading Order
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• Higher Twist Effects in Proton-Proton Collisions
• New Parametrizations for the Photon Structure Function
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Cited by in corpus (10)

• Higher Twist Effects in Proton-Proton Collisions
• Infrared renormalons and single meson production in proton-proton collisions
• Higher Twist Effects in Photon-Photon Collisions
• Meson Wave Functions From Holographic Qcd And The Role Of Infrared Renormalons In Proton-Proton Collisions
• Inclusive Gluon Production in Pion-Proton Collisions and the Principle Maximum Conformality Renormalization Scale
• The Meson Production in Proton-Proton Collisions in Next-To-Leading Order and Infrared Renormalons
• Meson Production in Proton-Proton Collisions in the Naive Non-Abelianization Approximation and the Role of Infrared Renormalons
• Pion wave functions from holographic QCD and the role of infrared renormalons in photon-photon collisions
• The inclusive production of charged pion pairs in proton-antiproton collisions
• Higher-twist mechanism and inclusive gluon production in pion-proton collisions