Studying the emergence of Hot & Cold QCD phenomena in Heavy Ions at the ATLAS experiment

Tuesday 27 Feb 2024, 15:00 → 17:00 Europe/Rome

IR-1A (Aula Riunioni) (Via Irnerio 46)

Riccardo Longo (University of Illinois Urbana-Champaign)

Ricercatori INFN Bologna is inviting you to a scheduled Zoom meeting.

Topic: ATLAS ZDC
Time: Feb 27, 2024 02:30 PM Rome

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Meeting ID: 920 6795 7633
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15:00 → 17:00 Studying the emergence of Hot & Cold QCD phenomena in Heavy Ions at the ATLAS experiment

Since the beginning of its operations, the ATLAS experiment has participated in the LHC Heavy-ion program, recording A+A and p+A collisions at different center of mass energies, as well as dedicated low luminosity p+p data to be used as a baseline to study nuclear modification effects. Thanks to the ATLAS detector's versatility, several unique measurements have been performed using Run 1 and 2 data, advancing the understanding of Quantum Chromodynamics (QCD) in both hot and cold temperature regimes and of precision Quantum Electrodynamics.
Jet and track-based measurements in A+A collisions provided input to probe the strong coupling behavior of the Quark Gluon Plasma (QGP) over a variety of length scales to explore the emergence of quark and gluon modes at short wavelengths. Meanwhile, similar measurements in smaller systems like p+A, p+p, and photo-nuclear reactions have found collective behavior and, at the same time, no clear evidence of QGP formation, raising several intriguing questions that still need to be answered. p+A and photo-nuclear reactions have also been extensively studied at ATLAS to investigate initial-state effects, shedding light on dynamics related to nuclear structure and color fluctuations in the proton.
Several of these measurements rely on the collision geometry characterization that is provided by a high-performance Zero Degree Calorimeter (ZDC) installed for Heavy Ion runs at ±140 meters from the interaction point. This vital piece of instrumentation will need an upgrade for the HL-LHC era, where the radiation environment and space available for detector implementation will place significant challenges that demand the construction of a new HL-ZDC.
This talk will feature recent results obtained by the ATLAS Heavy Ion group, review the performance of the existing ZDC, and discuss the future outlook for the HL-ZDC upgrade.

Speaker: Dr Riccardo Longo (University of Illinois Urbana-Champaign)

02272024_BolognaSeminar_Final.pdf