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ATLAS Preprints

Derniers ajouts:
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.
Fulltext

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2024-03-14
09:00
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
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. [...]
CERN-EP-2024-044.
- 2024.
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2024-03-12
08:10
Search for charged-lepton-flavour violating $\mu\tau qt$ interactions in top-quark production and decay in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector at the LHC / ATLAS Collaboration
A search for charged-lepton-flavour violating $\mu\tau qt$ ($q=u,c$) interactions is presented, considering both top-quark production and decay. [...]
arXiv:2403.06742 ; CERN-EP-2024-061.
- 2024. - 54 p.
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2024-03-11
09:20
Observation of electroweak production of $W^+W^-$ in association with jets in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector / ATLAS Collaboration
A measurement of the production of $W$ bosons with opposite electric charges in association with two jets is presented based on 140 fb$^{-1}$ of data collected by the ATLAS detector in proton-proton collisions at $\sqrt{s}=13$ TeV. [...]
arXiv:2403.04869 ; CERN-EP-2024-015.
- 2024. - 41 p.
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2024-03-06
09:30
Fiducial and differential cross-section measurements of electroweak $W\gamma jj$ production in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
The observation of the electroweak production of a $W$ boson and a photon in association with two jets, using $pp$ collision data at the Large Hadron Collider at a centre of mass energy of $\sqrt{s}=13$ TeV, is reported. [...]
arXiv:2403.02809 ; CERN-EP-2024-048.
- 2024. - 48 p.
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2024-03-06
09:16
Differential cross-sections for events with missing transverse momentum and jets measured with the ATLAS detector in 13 TeV proton-proton collisions / ATLAS Collaboration
Measurements of inclusive, differential cross-sections for the production of events with missing transverse momentum in association with jets in proton-proton collisions at $\sqrt{s}=13$ TeV are presented. [...]
arXiv:2403.02793 ; CERN-EP-2024-034.
- 2024. - 63 p.
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2024-03-05
09:05
Measurement of $t$-channel production of single top quarks and antiquarks in $pp$ collisions at 13 TeV using the full ATLAS Run 2 data sample / ATLAS Collaboration
The production of single top quarks and top antiquarks via the $t$-channel exchange of a virtual $W$ boson is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV at the LHC using $140\,\mathrm{fb^{-1}}$ of ATLAS data. [...]
arXiv:2403.02126 ; CERN-EP-2023-289.
- 2024. - 61 p.
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