Speaker
Gabor David
(Brookhaven National Laboratory)
Description
Recent results at RHIC and LHC on centrality dependence of various high pT
observables in very asymmetric collisions (p/d+A) raised a lively discussion
on the ways event-by-event geometry is determined experimentally. In other words:
are the methods based on average soft production still applicable once a truly
hard scattering occurs in a very asymmetric system? In the kinematic limit the
answer is obviously no; at some point the naive factorization of soft and hard
processes should break down. We will compare strength, weaknesses and limitations
of the original Glauber MC and some alternative procedures suggested so far, and
explore whether at least part of the model assumptions can be verified or falsified,
which would lead to a reduction of the ambiguities in basic quantities like impact parameter, number of participants and collisions.
Author
Gabor David
(Brookhaven National Laboratory)
