20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Unintegrated parton densities at small x

23 Jul 2011, 12:00
15m
Bayard (Alpes Congrès - Alpexpo)

Bayard

Alpes Congrès - Alpexpo

Parallel session talk QCD QCD

Speaker

Dr Martin Hentschinski (IFT-UAM Madrid)

Description

We present a definition of an unintegrated seaquark density for the LO CCFM Monte-Carlo CASCADE and discuss determination of a NLO BFKL unintegrated gluon density from a fit to combined HERA data. The kT-dependent sea-quark density is defined using high energy factorization, while the quark-gluon splitting is treated with exact kinematics. The latter is found to agree with the kT-dependent splitting function obtained by Catani and Hautmann. The result is implemented into CASCADE and a comparison of exact versus factorized matrix element is carried out for forward Z production. The unintegrated gluon density is obtained as a convolution of NLO BFKL Green's function and non-perturbative proton impact factor. We discuss several aspects of the construction of the collinear improved Green's function, which is taken with the full NLO running coupling corrections. For the proton impact we construct a model, where free parameters are determined by the fit.

Primary author

Dr Martin Hentschinski (IFT-UAM Madrid)

Co-authors

Dr Agustin Sabio Vera (IFT-UAM Madrid) Ms Clara Salas Hernandez (IFT-UAM Madrid)

Presentation Materials