Eccentricity and elliptic flow in pp collisions at the LHC

Understand

High-multiplicity proton-proton collisions at the LHC may exhibit collective phenomena such as elliptic flow.

• We study this issue using DIPSY, a brand-new Monte Carlo event generator which features almost-NLO BFKL dynamics and describes the transverse shape of the proton including all fluctuations.
• We predict the eccentricity of the collision as a function of the multiplicity and estimate the magnitude of elliptic flow.
• We suggest that flow can be signaled by a sign change in the four-particle azimuthal correlation.