Elliptic Flow Dependance on “Effective Energy” in pp Collisions at √s=13.6 TeV Measured in the ATLAS Experiment

by Bar Glik

BGU

at Particles and Fields Seminar

Mon, 27 Jan 2025, 14:00
Sacta-Rashi Building for Physics (54), room 207

Abstract

The extreme energy density of high energy heavy-ion collisions at the LHC produces the quark gluon plasma - QCD state of matter. The matter appears to be well described by hydrodynamics and a salient signature of the medium is its “transverse flow”. This flow arises from collective expansion of the medium transverse to the beam direction and manifests as an anisotropic azimuthal distribution of final state particles. These particles are measured in the ATLAS detector, and analyzed to quantify the flow. The flow phenomena are largely understood (as stemming from the quark gluon plasma) in heavy-ion collisions and described well by models of the collision geometry coupled with hydrodynamic evolution. Somewhat surprisingly flow appear also in proton proton collisions where its origin is murkier. Several studies have been undertaken to learn under what conditions flow develops in proton proton collisions, and if there is a parameter which controls it similar to geometry in heavy-ion collisions.
In this talk, I will present a novel approach to characterizing pp collisions using forward detectors to define an "effective collision energy" variable and present flow measurement as a function of this effective energy.

Created on 29-12-2024 by Kats, Yevgeny (katsye)
Updaded on 20-01-2025 by Kats, Yevgeny (katsye)