Higher twist effects in proton-proton collisions

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Ahmadov A. I., Boztosun I., Muradov R. K., Soylu A., Dadashov E. A.

INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, cilt.15, sa.6, ss.1209-1231, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 15 Sayı: 6
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1142/s0218301306004843
  • Dergi Adı: INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1209-1231
  • Anahtar Kelimeler: leading twist, high twist, pion wave function, LARGE-MOMENTUM-TRANSFER, QCD SUM-RULES, PION WAVE-FUNCTION, EXCLUSIVE PROCESSES, FORM-FACTORS, MESONS, SCATTERING
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

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.