Speaker
Prof.
Néstor Armesto
(Universidade de Santiago de Compostela)
Description
In this talk I will review how coherence phenomena affect most aspects of the
description of high-energy hadronic collisions. Concerning their initial stage, I
will consider correlations in the wave function of the colliding hadrons, nucleons
or nuclei, that are reflected in the final state. I will argue that such
correlations offer an explanation for the description of observed phenomena in
proton-proton and proton-nucleus collisions at the LHC such as the ridge, i.e.
two-particle correlations along several rapidity units collimated in azimuthal
angle, so they are enhanced at zero and 180 degrees. Then, turning to the final
stage of the collisions, I will address how coherence in the QCD branching process
is involved in the phenomena of energy loss of fast partons traversing the
partonic medium produced in heavy-ion collisions, used as hard probes of the
medium.
