345 research outputs found
Role of quantum fluctuations in a system with strong fields
In this work we study how quantum fluctuations modify the quantum evolution
of an initially classical field theory. We consider a scalar theory
coupled to an external source as a toy model for the Color Glass Condensate
description of the early time dynamics of heavy-ion collisions. We demonstrate
that quantum fluctuations considerably modify the time evolution driving the
system to evolve in accordance with ideal hydrodynamics. We attempt to
understand the mechanism behind this relaxation to ideal hydrodynamics by using
modified initial spectra and studying the particle content of the theory.Comment: Prepared for the New Journal of Physics Focus Issue "Strongly
Correlated Quantum Fluids: From Ultracold Quantum Gases to QCD Plasmas
Azimuthal collimation of long range rapidity correlations by strong color fields in high multiplicity hadron-hadron collisions
The azimuthal collimation of di-hadrons with large rapidity separations in
high multiplicity p+p collisions at the LHC is described in the Color Glass
Condensate (CGC) effective theory [1] by N_c^2 suppressed multi-ladder QCD
diagrams that are enhanced \alpha_S^(-8) due to gluon saturation in hadron
wavefunctions. We show that quantitative computations in the CGC framework are
in good agreement with data from the CMS experiment on per trigger di-hadron
yields and predict further systematics of these yields with varying trigger pT
and charged hadron multiplicity. Radial flow generated by re-scattering is
strongly limited by the structure of the p+p di-hadron correlations. In
contrast, radial flow explains the systematics of identical measurements in
heavy ion collisions.Comment: accepted version for PR
- …