Speaker
Description
Despite being the overwhelming majority of events produced in
hadron or heavy ion collisions, minimum bias events do not enjoy a robust
first-principles theoretical description as their dynamics are dominated
by low-energy quantum chromodynamics. In this talk, I will present a novel
expansion scheme of the cross section for minimum bias events in the large
number of detected particles N >> 1. I will identify power counting rules
and symmetries of minimum bias from which the form of the squared matrix
element can be expanded in irreducible symmetric polynomials of the phase
space coordinates. As two applications of this expansion, the single-
particle transverse momentum spectrum in pp collisions can be described by
a one-parameter distribution and the constraint of positivity of the
squared matrix element forces all azimuthal correlations in heavy ion
collisions vanish in the N → ∞ limit, as observed in data.
| Preferred track | Forward & Diffractive Physics |
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