Monte Carlo and large angle gluon radiation

Yuri Dokshitzer (1) , G. Marchesini (2)

1 LPTHE - Laboratoire de Physique Théorique et Hautes Energies
2 Dipartimento Fisica Teorica

We discuss the problem of incorporating recoil effects into the probabilistic QCD evolution scheme based on the picture of colour dipoles as done in recent Monte Carlo programs. Such a scheme correctly describes subleading soft contributions to multiplicity distributions. However we find that a {\it simple}\/ receipt for incorporating recoil effects into the dipole multiplication picture based on the ordering of gluon {\em energies}\/ conflicts the collinear factorization and does not lead to the correct DGLAP equation.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Yuri Dokshitzer, G. Marchesini. Monte Carlo and large angle gluon radiation. Journal of High Energy Physics, 2009, pp.0903:117. ⟨hal-00344187⟩