Two-dimensional discrete wavelet analysis of multiparticle event topology in heavy-ion collisions

Abstract

The event-by-event analysis of multiparticle production in high energy hadron and nuclei collisions can be performed using the discrete wavelet transformation. The ring-like and jet-like structures in two-dimensional angular histograms are well extracted by wavelet analysis. For the first time the method is applied to the jet-like events with background simulated by event generators, which are developed to describe nucleus-nucleus collisions at LHC energies. The jet positions are located quite well by the discrete wavelet transformation of angular particle distribution even in presence of strong background.

Jet-images: computer vision inspired techniques for jet tagging

“…Third, the similarity between two jets can be easily and quickly computed using standard linear algebra computations. While the concept of analyzing jets as images is not new (see for instance [43][44][45][46]), this paper presents a computer vision inspired framework for processing and interpretation of jet-images.…”

The Wake in Mid-Central Nuclear Collisions

“…They are not taken into account in Eq. (10) where the intensity of the radiation at the creation points is shown. It should be damped exponentially with its path from the creation point to the surface.…”

“…The second term in (10) corresponds to the radiation induced by the longitudinal oscillations in the wake left behind the away-side parton. It is emitted mostly in the direction perpendicular to the wake.…”

“…However, the collision axis imposes some special direction in the problem which could influence the chromopermittivity tensor Lorenz-transforming it. Therefore, even for central collisions it would be instructive to measure the Cherenkov humps for the trigger orientation different from about π/2 (see [10]).…”

QCD in the nuclear medium and effects due to Cherenkov gluons

“…Some estimates of properties of the nuclear matter formed in ultrarelativistic heavy-ion collisions have been done. This consideration predicts new features at the LHC [25].…”