Validity check of the KATIE parton level event generator in the k_{t}factorization and collinear frameworks
Abstract
In the present paper, we check and study the validity of the KATIE parton level event generator by calculating the inclusive electronproton (ep) dijet and the protonproton (pp) DrellYan electronpair production's differential cross sections in the k_{t} and collinear factorization frameworks. The MartinRyskinWatt (MRW) unintegrated parton distribution functions (UPDFs) are used as the input UPDFs. The results are compared with those of ZEUS ep inclusive dijet and ATLAS pp DrellYan electronpair productions, experimental data. The KATIE parton level event generator can directly calculate the cross sections in the k_{t}factorization framework. It was noticed by van Hameren, the author of KATIE, that the lab to the Breit transformation in this generator was not correctly implemented, so the produced output did not cover the ep ZEUS experimental data in which the mentioned transformation is applied. The author of the code fixed the bug by implementing the correct transformation in the KATIE parton event generator. Then, we could appropriately produce the ep inclusive dijet differential cross section, in comparison with those of ZEUS data. It is also shown that the MartinRyskinWatt at the nexttoleading order level, with the angular ordering constraint, can successfully predict the ATLAS pp DrellYan data. Finally, as it is expected, we conclude that the k_{t} factorization is an appropriate tool for the small longitudinal parton momenta and high center of mass energies, with respect to the collinear one.
 Publication:

Physical Review D
 Pub Date:
 September 2021
 DOI:
 10.1103/PhysRevD.104.054019
 arXiv:
 arXiv:2107.14649
 Bibcode:
 2021PhRvD.104e4019K
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment;
 High Energy Physics  Theory
 EPrint:
 Phys. Rev. D 104, 054019 (2021)