2021-01-22 15:43 |
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2021-01-21 22:55 |
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2021-01-21 21:28 |
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2021-01-21 21:24 |
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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
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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
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Original Communication (restricted to ATLAS) Fulltext
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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.
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Original Communication (restricted to ATLAS) Fulltext
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2021-01-19 09:05 |
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2021-01-18 20:45 |
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2021-01-18 17:50 |
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