High Energy Scattering in QCD: Putting Together All the Main Ingredients

Noviembre 2, 2015
De 3:00pm hasta 4:00pm

IFT Seminar Room/Red Room

Specialist level
José Daniel Madrigal
IPhT, Saclay

IFT Seminar Room/Red Room


In this seminar we first provide a pedagogical introduction to the description of QCD dynamics in processes characterized by a very large center-of-mass energy, describing how radiative corrections enhanced by logs of this quantity lead to an exponential rising of the gluon density inside a hadron until saturation is reached. We then argue that this energy evolution as encoded in the BFKL/BK equations still presents large collinear radiative corrections at each order in perturbation theory which need to be resummed for making reliable contact with phenomenology, and show how to perform this nontrivial resummation. The relevance of this improvement is shown by very succesful and discriminatory fits to the HERA DIS data, including for the first time all main ingredients of high-energy QCD: rapidity/energy logs, collinear double and single logs, running coupling and saturation.