CERN Accelerating science

ATLAS Preprints

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2021-05-18
08:39
Flow harmonics in heavy ion physics at CMS and ATLAS / Krintiras, Georgios Konstantinos
How can we gain a detailed insight into the hydrodynamic response of the system created in heavy ion collisions to the fluctuating initial geometry and viscous effects? Do we create a strongly interacting medium in proton-nucleus and proton-proton collisions, or rather a system of partons undergoing few scatterings? To what extent can we discriminate between initial momentum correlations and flow generated as a response to the initial geometry via interactions in the final state? Do measurements of identified particle flow confirm the observations from inclusive charged hadrons? An experimental overview of anisotropic flow measurements, ranging from large down to the smallest collision systems, is given in these proceedings..
arXiv:2105.07287.
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2021-05-13
09:51
Top quark mass and cross sections in ATLAS and CMS / Defranchis, Matteo M.
With the large data set delivered during the second run of the CERN LHC, inclusive and differential measurements of the top quark-antiquark production cross section at the ATLAS and CMS experiments often reach a precision that is comparable or superior to that of the corresponding theoretical calculations. [...]
arXiv:2105.05776.
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2021-05-06
19:33
Higgs rare and exotic decays / Morvaj, Ljiljana (CERN)
Several recent searches for exotic and rare decays of the Standard Model Higgs with the ATLAS and CMS detectors are presented. [...]
arXiv:2105.06951 ; ATL-PHYS-PROC-2021-022.
- 2021. - 6 p.
Original Communication (restricted to ATLAS) - Full text - Fulltext

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2021-05-03
15:51
Performance of the ATLAS Level-1 topological trigger in Run 2 / ATLAS Collaboration
During LHC Run 2 (2015-2018) the ATLAS Level-1 topological trigger allowed efficient data-taking by the ATLAS experiment at luminosities up to 2.1x10$^{34}$ cm$^{-2}$s$^{-1}$, which exceeds the design value by a factor of two. [...]
arXiv:2105.01416 ; CERN-EP-2021-040.
- 2021. - 36 p.
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2021-04-28
13:23
Treatment of top-quark backgrounds in extreme phase spaces: the ''top $p_{T}$ reweighting'' and novel data-driven estimations in ATLAS and CMS / Serkin, Leonid (Abdus Salam Int. Cent. Theor. Phys. (IT))
The top quark plays an important role in searches for physics beyond the SM, both as a dominant background and as a key signature for the signal. [...]
arXiv:2105.03977 ; ATL-PHYS-PROC-2021-016.
- 2021. - 7 p.
Original Communication (restricted to ATLAS) - Full text - Fulltext

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2021-04-27
11:19
Search for dark matter in events with missing transverse momentum and a Higgs boson decaying into two photons in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
A search for dark-matter particles in events with large missing transverse momentum and a Higgs boson candidate decaying into two photons is reported. [...]
arXiv:2104.13240 ; CERN-EP-2021-012.
- 2021. - 49 p.
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2021-04-07
13:04
A search for the decays of stopped long-lived particles at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
A search for long-lived particles, which have come to rest within the ATLAS detector, is presented. [...]
arXiv:2104.03050 ; CERN-EP-2021-041.
- 2021. - 48 p.
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2021-04-01
04:35
Measuring standard model parameters using top-quark cross sections in ATLAS and CMS / Defranchis, Matteo M. (CERN) /ATLAS Collaboration ; CMS Collaboration
Theoretical predictions of top-quark cross sections depend on the values of the parameters of the quantum chromodynamics Lagrangian, such as the strong coupling constant and the mass of the top quark, but also on parameters of the electroweak sector of the standard model and parton distribution functions. Comparisons between state-of-the-art calculations and recent measurements at the ATLAS and CMS experiments at the CERN LHC allow for the precise determination of these parameters. [...]
arXiv:2103.16384.- 2021-03-30 - 6 p. Fulltext: PDF;
In : 13th International Workshop on Top-Quark Physics, Durham, United Kingdom, 14 - 18 Sep 2020

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2021-03-26
04:01
Latest Studies of the SM Higgs Boson Couplings to Fermions at ATLAS / Liu, Yanlin (Michigan U.)
This proceeding presents the latest studies on the Yukawa couplings of the Standard Model Higgs boson with 139 fb$^{-1}$ data collected using the ATLAS detector at a center-of-mass energy of 13 TeV. [...]
arXiv:2103.12780.
- 5 p.
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2021-03-23
14:43
Measurements of the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a $Z$ boson at $\sqrt{s} = 13$ TeV with the ATLAS detector
Measurements of both the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a $Z$ boson ($t\bar{t}Z$) are presented. [...]
CERN-EP-2021-011.
- 2021.
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