AAMQS: a non-linear QCD description of new HERA data at small-x

May 26, 2011, 4:40 PM
20m
Rotonde de l'Europe (150) (Imperial Palace)

Rotonde de l'Europe (150)

Imperial Palace

Allée Impérial 74000 Annecy, France Tél. : +33 4 50 09 30 00
Parallel Pre-equilibrium and initial state physics Pre-equilibrium and initial state

Speaker

Dr Paloma Quiroga Arias (LPTHE , UPMC Univ. Paris 6)

Description

Recent developments in the computation of the NLO improvement for non-linear QCD evolution equations has allowed, for the first time, for the consistent description of experimental data using a first principle approach. In particular, the Balitsky-Kovchegov equation including running coupling effects (rcBK) has been shown to provide an excellent global description of inclusive DIS data. I will present a global analysis of available data on inclusive structure functions measured in electron-proton scattering at small values of Bjorken-x, including the latest data from the combined HERA analysis on reduced cross sections. The resulting parametrizations allow for the reliable computation of physical observables in a kinematical region (relevant for both p-p and A-A programmes at the LHC) where the standard DGLAP based techniques are expected to fail. Also, the inclusion of the heavy quark contribution has resulted in a good description of the experimental data for the charm component of the proton structure function. Further, I will discuss the kinematical domain where significant deviations from NLO-DGLAP should be expected and a strategy to interface this approach, reliant on k_t factorization, with the commonly used collinearly factorized parton distribution functions. Also preliminary extensions for nuclei will be discussed.

Primary author

Dr Paloma Quiroga Arias (LPTHE , UPMC Univ. Paris 6)

Co-authors

Carlos Salgado (Departamento de Fisica de Particulas and IGFAE, Universidade de Santiago de Compostela) Guilherme Milhano (CENTRA, IST Lisbon and CERN TH) Javier Albacete (Institut de Physique Theorique, CEA/Saclay) Nestor Armesto (Departamento de Fisica de Particulas and IGFAE, Universidade de Santiago de Compostela)

Presentation materials