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ATLAS Preprints

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2024-03-25
07:02
Measurements of electroweak $W^{\pm}Z$ boson pair production in association with two jets in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
Measurements of integrated and differential cross-sections for electroweak $W^{\pm}Z$ production in association with two jets ($W^{\pm}Zjj$) in proton-proton collisions are presented. [...]
arXiv:2403.15296 ; CERN-EP-2024-082.
- 2024. - 53 p.
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2024-03-25
06:55
Search for light long-lived particles in $pp$ collisions at $\sqrt{s}=13$ TeV using displaced vertices in the ATLAS inner detector / ATLAS Collaboration
A search for long-lived particles (LLPs) using 140 fb$^{-1}$ of $pp$ collision data with $\sqrt{s} = 13$ TeV recorded by the ATLAS experiment at the LHC is presented. [...]
arXiv:2403.15332 ; CERN-EP-2024-086.
- 2024. - 35 p.
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2024-03-25
06:47
Measurements of the production cross-section for a $Z$ boson in association with $b$- or $c$-jets in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
This paper presents a measurement of the production cross-section of a $Z$ boson in association with $b$- or $c$-jets, in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 140 fb$^{-1}$. [...]
arXiv:2403.15093 ; CERN-EP-2024-081.
- 2024. - 60 p.
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2024-03-22
16:18
Search for heavy Majorana neutrinos in $e^{\pm} e^{\pm}$ and $e^{\pm} \mu^{\pm}$ final states via WW scattering in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
A search for heavy Majorana neutrinos in scattering of same-sign $W$ boson pairs in proton-proton collisions at $\sqrt{s}= 13$ TeV at the LHC is reported. [...]
CERN-EP-2024-083.
- 2024.
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2024-03-22
16:05
Measurement of the W-boson mass and width with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 7 TeV / ATLAS Collaboration
Proton-proton data recorded by the ATLAS detector in 2011, at a centre-of-mass energy of 7 TeV, have been used for an improved determination of the W-boson mass and a first measurement of the W-boson width at the LHC. [...]
arXiv:2403.15085 ; CERN-EP-2024-074.
- 2024. - 51 p.
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2024-03-19
13:13
Measurement of vector boson production cross sections and their ratios using $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS detector / ATLAS Collaboration
Fiducial and total $W^\pm$ and $Z$ boson cross sections, their ratios and the ratio of top-antitop-quark pair and $W$-boson fiducial cross sections are measured in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13.6$ TeV, corresponding to an integrated luminosity of 29 fb$^{-1}$ of data collected in 2022 by the ATLAS experiment at the Large Hadron Collider [...]
arXiv:2403.12902 ; CERN-EP-2024-069.
- 2024. - 42 p.
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2024-03-18
10:48
Four tops, SM and BSM by ATLAS and CMS, including EFT interpretations / Bhowmik, Sandeep (Cantabria Inst. of Phys.) /ATLAS and CMS Collaborations
This article presents the observation of four-top-quark ($\rm t\bar{t}t\bar{t}$) production in proton-proton collisions by the ATLAS and CMS experiments at the CERN LHC. The analysis is performed using data samples collected by both experiments separately at a center-of-mass energy of 13 TeV during 2016-2018 and corresponding to an integrated luminosity of 140 $\rm fb^{-1}$ and 138 $\rm fb^{-1}$ by the ATLAS and CMS Collaborations respectively. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured $\rm t\bar{t}t\bar{t}$ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations by the ATLAS and 5.6 (4.9) standard deviations by CMS experiment. The $\rm t\bar{t}t\bar{t}$ production cross section is measured to be $\rm 22.5^{+6.6}_{-5.5}$ fb and $\rm 17.7^{+4.4}_{-4.0}$ fb by the ATLAS and CMS experiment respectively, in agreement with the available standard model predictions. Data are also used by the ATLAS experiment to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect $\rm t\bar{t}t\bar{t}$ production..
CMS-CR-2024-056.- Geneva : CERN, 2024 - 11 p. Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons , Mumbai, In, 28 Nov - 2 Dec 2023

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2024-03-15
13:28
Exploration at the high-energy frontier: ATLAS Run 2 searches investigating the exotic jungle beyond the Standard Model / ATLAS Collaboration
The Large Hadron Collider is at the high-energy frontier of particle physics, having produced proton-proton collisions during Run 2, from 2015 to 2018, at an unprecedented centre-of-mass energy of 13 TeV. [...]
arXiv:2403.09292 ; CERN-EP-2024-075.
- 2024. - 123 p.
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2024-03-15
13:22
Measurements of inclusive and differential cross-sections of $t\bar{t}\gamma$ production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
Inclusive and differential cross-sections are measured at particle level for the associated production of a top quark pair and a photon ($t\bar{t}\gamma$). [...]
arXiv:2403.09452 ; CERN-EP-2024-052.
- 2024. - 72 p.
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2024-03-15
05:33
Search for low-mass resonances decaying into two jets and produced in association with a photon or a jet at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
A search is performed for localized excesses in the low-mass dijet invariant mass distribution, targeting a hypothetical new particle decaying into two jets and produced in association with either a high transverse momentum photon or a jet. [...]
arXiv:2403.08547.
- 43 p.
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