Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-21
Int.J.Mod.Phys.E15:1209-1232,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages 18 figures RevTex4
Scientific paper
10.1142/S0218301306004843
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.
Ahmadov Azar I.
Boztosun Ismail
Dadashov E. A.
Muradov Kh. R.
Soylu A.
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