# CERN Accelerating science

The ATLAS Conference Slides collection contains transparencies on ATLAS that have been presented at conferences. More information about conferences can be found on the external ATLAS Talks at International Physics Conferences webpage.
SUBMIT ATLAS SLIDE

# ATLAS Conference Slides

2021-01-22
15:43
 Sensitivity of jet quenching to the initial geometry in Pb+Pb collisions with ATLAS / Rinn, Timothy Thomas (University of Illinois at Urbana-Champaign) /ATLAS Collaboration Measurements of jet suppression and modification in heavy-ion collisions provide powerful and broad information on the dynamics of the hot, dense plasma formed in relativistic nucleus-nucleus collisions. In this talk at the Initial Stages conference, we present measurements of jet energy loss and modification which are sensitive to the initial transverse geometry of Pb+Pb collisions. [...] ATL-PHYS-SLIDE-2021-016.- Geneva : CERN, 2021 - 1 p. Fulltext: PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021

2021-01-21
22:55
 Recent ATLAS measurements of correlations from small to large collision systems / Mohapatra, Soumya (Nevis Laboratory, Columbia University) /ATLAS Collaboration Measurements of two-particle correlations in pp collisions show features that are strikingly similar to those seen in heavy-ion collisions, suggesting that a tiny droplet of the QGP is produced even in such collisions. In the pp collisions models that attribute the correlations to semi-hard processes can also qualitatively reproduce the measurements. [...] ATL-PHYS-SLIDE-2021-015.- Geneva : CERN, 2021 Fulltext: PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021

2021-01-21
21:28
 Recent heavy flavor and quarkonium measurements with the ATLAS detector / Lebedev, Alexandre (Iowa State University) /ATLAS Collaboration Measurements of open heavy-flavor hadron and quarkonium in heavy-ion collisions provide a powerful tool to study both initial-state effects on heavy-quark production and final-state interactions between heavy quarks and the quark-gluon plasma (QGP). Recent ATLAS measurements of azimuthal anisotropy of muons from heavy-flavor decays in pp and Pb+Pb collisions are presented. [...] ATL-PHYS-SLIDE-2021-014.- Geneva : CERN, 2021 - 15 p. Fulltext: ATL-PHYS-SLIDE-2021-014 - PDF; Recent_heavy_flavor_and_quarkonia_results_from_ATLAS - PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021

2021-01-21
21:24
 Measurements of long-range correlations in photonuclear collisions with ATLAS / Seidlitz, Blair Daniel (University of Colorado Boulder) /ATLAS Collaboration The ultra-peripheral collisions (UPCs) of relativistic heavy ion beams lead to a diverse set of photon-nucleus interactions. The measurements of particles and their interaction produced in photo-nuclear reactions can shed light on the QCD dynamics of novel, extremely asymmetric colliding systems, with energies between those available at RHIC and the LHC. [...] ATL-PHYS-SLIDE-2021-013.- Geneva : CERN, 2021 Fulltext: PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021

2021-01-21
18:02
 Correlations between flow and transverse momentum in Pb+Pb and Xe+Xe collisions with ATLAS / Behera, Arabinda (Stony Brook University) /ATLAS Collaboration The measurement of the correlation between flow harmonics $v_n$ and average transverse momentum $p_\mathrm{T}$ for n = 2, 3 and 4 with the ATLAS detector at the LHC is presented, based on 3$\mu \mathrm{b}^{-1}$ Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV and 22$\mu \mathrm{b}^{-1}$ Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. This correlation is characterized by the Pearson correlation coefficient, $\rho(v_n^2,[p_\mathrm{T}])$, which quantifies the strength of the correlation between $v_n^2$ and event-by-event average $p_\mathrm{T}$, $[p_\mathrm{T}]$. [...] ATL-PHYS-SLIDE-2021-012.- Geneva : CERN, 2021 Fulltext: PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021

2021-01-20
07:35
The track-based alignment of the ALFA Roman Pot detectors of the ATLAS experiment
 Reference: ATL-FWD-PUB-2021-003 Note: PUB Keywords:  ALFA, alignment Created: 2021. -1 p ALFA detector is part of the ATLAS Roman Pot detector dedicated to measure protons scattered at very small angles. ALFA aims to study elastic and diffractive events in special runs with reduced luminosity and optimized beam optics. Precision of the measurement depends on the correct positioning of the ALFA detector with respect to the actual beam position. For this purpose track-based procedure is used which utilizes tracks of beam halo and elastic protons collected during physics data taking. This poster presents results of fast and robust alignment of ALFA detectors during LHC Run 2. The alignment constants are used in analysis of diffractive events and also serve as preliminary values in elastic analysis. Precise measurements of the elastic cross sections required dedicated more precise measurement Original Communication (restricted to ATLAS)Fulltext

2021-01-19
19:50
A study of the proton reconstruction efficiency with the ALFA detector using an overlay technique of Monte Carlo signal events with zero-bias collider data.
 Reference: ATL-FWD-PUB-2021-001 Note: PUB Created: 2021. -mult. p The purpose of the ATLAS Roman Pot (ARP) detector is to measure protons scattered at very small angles. ARP aims to study elastic and diffractive events, exclusive production and photon induced interactions. In LHC Run 2, ARP participated in the ATLAS high-luminosity data taking. In addition, several special runs with reduced luminosity were taken. Any cross section measurement requires good understanding of the particle reconstruction efficiency. This task is particularly complicated in case of forward protons where actual beam condition is important part of the working environment. Modeling of the very forward region in terms of primary particle flux and inactive material producing secondary particle is generally not precise. An overlay technique of MonteCarlo signal events with zero-bias collider data overcomes these difficulties and may provide better understanding of the proton reconstruction efficiency. Proposed plots present results of the proton reconstruction efficiency with the ALFA detector. Original Communication (restricted to ATLAS)Fulltext

2021-01-19
09:05
 Recent heavy-ion results from ATLAS / Tapia Araya, Sebastian (University of Illinois at Urbana-Champaign) /ATLAS Collaboration Summary of new results from ATLAS to be presented in Initial stages 2021 ATL-PHYS-SLIDE-2021-011.- Geneva : CERN, 2021 - 24 p. Fulltext: PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021

2021-01-18
20:45
 Measurement of $\gamma\gamma \rightarrow \mu^{+}\mu^{-}$ pairs in non-ultra peripheral Pb+Pb collisions with the ATLAS detector / Gilbert, Benjamin Jacob (Nevis Laboratory, Columbia University) ; Mohapatra, Soumya (Nevis Laboratory, Columbia University) ; Cole, Brian (Nevis Laboratory, Columbia University) /ATLAS Collaboration ATLAS measurements of dimuons produced via γγ scattering processes in inelastic, non-ultra-peripheral Pb+Pb collisions at 5.02 TeV are presented using an integrated luminosity of 1.9 nb−1. The γγ→μ+μ− pairs are identified via selections on pair momentum asymmetry and acoplanarity, and the contribution from the heavy flavor decay background is estimated using both template and asymptotic fit methods. [...] ATL-PHYS-SLIDE-2021-010.- Geneva : CERN, 2021 - 1 p. Fulltext: PDF; External link: Original Communication (restricted to ATLAS)

2021-01-18
17:50
 Review of Flow, Non-flow and Decorrelation Observables / Hu, Qipeng (Lawrence Livermore National Laboratory) /ATLAS Collaboration Invited talk by Initial Stage 2021 conference organizers ATL-PHYS-SLIDE-2021-009.- Geneva : CERN, 2021 Fulltext: PDF; External link: Original Communication (restricted to ATLAS) In : The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions, Weizmann Institute, Israel, 10 - 15 Jan 2021