https://doi.org/10.1140/epjc/s10052-009-0884-7
Regular Article - Theoretical Physics
Markovian MC simulation of QCD evolution at NLO level with minimum k T
1
Institute of Nuclear Physics IFJ-PAN, ul. Radzikowskiego 152, 31-342, Cracow, Poland
2
Marian Smoluchowski Institute of Physics, Jagiellonian University, ul. Reymonta 4, 30-059, Cracow, Poland
* e-mail: Przemyslaw.Stoklosa@ifj.edu.pl
Received:
17
October
2008
Revised:
27
November
2008
Published online:
13
February
2009
We present two Monte Carlo algorithms of the Markovian type which solve the modified QCD evolution equations at NLO level. The modifications with respect to the standard DGLAP evolution concern the argument of the strong coupling constant, α S. We first analyze the z-dependent argument and then the k T -dependent one. The evolution time variable is identified with the rapidity. The two algorithms are tested to 0.05% precision level. We find that the NLO corrections in the evolution of the parton momentum distributions with k T -dependent coupling constant are of the order of 10 to 20%, and in the small-x region even up to 30%, with respect to the LO contributions.
PACS: 12.38.-t – / 12.38.Bx – / 12.38.Cy –
© Springer-Verlag , 2009
