May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

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

May 26, 2011, 4:40 PM
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


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


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)


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