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ATLAS Notes

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2025-03-20
18:31
The performance of the New Small Wheels of the ATLAS detector in the heart of LHC Run-3 / Tsigaridas, Stergios (TRIUMF (CA))
During the second long shutdown of the Large Hadron Collider (LHC) at CERN, the most important upgrade within the ATLAS experiment was replacement of the two inner endcap stations of the Muon Spectrometer (MS), with the New Small Wheels (NSW). [...]
ATL-MUON-PROC-2025-007. - 2025 - 4.
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2025-03-20
17:31
The ATLAS ITk Strip Detector System for the Phase-II LHC Upgrade. / Lacasta Llacer, Carlos (Univ. of Valencia and CSIC (ES))
ATLAS is currently preparing for the HL-LHC upgrade, with an all-silicon Inner Tracker (ITk) that will replace the current Inner Detector. [...]
ATL-ITK-PROC-2025-010. - 2025 - 4.
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2025-03-20
04:05
Heavy-ion physics highlights from ATLAS / Grabowska-Bold, Iwona (AGH University of Krakow (PL))
Recent measurements from the heavy-ion physics programme from the ATLAS experiment at the LHC are reviewed. [...]
ATL-PHYS-PROC-2025-022. - 2025 - 10.
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2025-03-19
11:43
ATLAS QCD jet measurements / Zaplatilek, Ota (Czech Technical University in Prague (CZ))
This article presents a recent QCD measurement of the jet cross-section ratios from the ATLAS experiment at CERN’s Large Hadron Collider, using proton–proton collisions at a center-of-mass energy of 13 TeV. [...]
ATL-PHYS-PROC-2025-021. - 2025 - 4.
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2025-03-18
12:06
Deriving constraints on long-lived axion-like particles from existing searches for exotic decays of the Higgs boson with the ATLAS detector
Two ATLAS searches for anomalous decays of the Higgs boson into pseudo-scalar particles are used to set exclusion limits for models containing decays to long-lived axion-like particles (ALPs). [...]
ATL-PHYS-PUB-2025-007. - 2025 - 13.
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2025-03-18
09:11
The High-Granularity Timing Detector for ATLAS at HL-LHC / Pinol Bel, Joaquim (The Barcelona Institute of Science and Technology (BIST) (ES))
The increased particle flux expected at the HL-LHC poses a serious challenge for the ATLAS 1 detector performance, especially in the forward region which has reduced detector granularity. [...]
ATL-HGTD-PROC-2025-001. - 2025 - 10.
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2025-03-11
14:19
ATLAS searches for electroweak supersymmetry with compressed spectra / Rasheed, Hammad (Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Supersymmetry (SUSY) models with featuring small mass splittings between one or more particles and the lightest neutralino \(\tilde{\chi}^{0}_{1}\) could solve the hierarchy problem as well as offer a suitable dark matter candidate consistent with the observed thermal-relic dark matter density. [...]
ATL-PHYS-PROC-2025-020. - 2025 - 11.
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2025-03-11
13:59
Highlights on top quark physics with the ATLAS experiment at the LHC / Hirschbuehl, Dominic (Bergische Universitaet Wuppertal (DE))
The large top-quark samples collected with the ATLAS experiment at the LHC together with a unprecedented understanding of the measured data have yielded measurements of production cross-sections for top-quark pair-production not only in new kinematic regions but also in association with additional quarks and boson. [...]
ATL-PHYS-PROC-2025-019. - 2025 - 4.
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2025-03-11
00:14
Electroweak measurements of multiboson production with the ATLAS experiment / Gotz, Stefanie Andrea (Ludwig Maximilians Universitat (DE))
Electroweak measurements of multiboson production provide a unique glance at the self-interactions of the electroweak gauge bosons, which are described by the electroweak symmetry breaking mechanism of the Standard Model. [...]
ATL-PHYS-PROC-2025-018. - 2025 - 10.
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2025-03-10
10:11
Investigating initial state of heavy-ion collisions using $[p_\mathrm{T}]$ fluctuations and $v_n - [p_\mathrm{T}]$ correlations in ATLAS / Bold, Tomasz (AGH University of Krakow (PL))
This paper presents recent studies of event-wise mean transverse momentum, $[p_\mathrm{T}]$ that can help differentiate the interplay between the effect of radial collectivity, random thermal motion and deformation in nuclear geometry. [...]
ATL-PHYS-PROC-2025-017. - 2025 - 6.
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