CERN Accelerating science

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1.
Measurement of the inclusive $t\bar{t}$ production cross section in the lepton+jets channel in $pp$ collisions at $\sqrt{s}$= 7 TeV with the ATLAS detector using support vector machines / ATLAS Collaboration
A measurement of the top quark pair-production cross section in the lepton+jets decay channel is presented. It is based on 4.6 fb$^{-1}$ of $\sqrt{s} = 7$ TeV $pp$ collision data collected during 2011 by the ATLAS experiment at the CERN Large Hadron Collider. [...]
arXiv:2212.00571; CERN-EP-2022-191.- Geneva : CERN, 2023-08-01 - 34 p. - Published in : Phys. Rev. D 108 (2023) 032014 Fulltext: 2212.00571 - PDF; Publication - PDF; External link: Previous draft version
2.
Measurement of the top-quark mass using a leptonic invariant mass in $pp$ collisions at $\sqrt{s}=13~\textrm{TeV}$ with the ATLAS detector / ATLAS Collaboration
A measurement of the top-quark mass ($m_t$) in the $t\bar{t}\rightarrow~\textrm{lepton}+\textrm{jets}$ channel is presented, with an experimental technique which exploits semileptonic decays of $b$-hadrons produced in the top-quark decay chain. The distribution of the invariant mass $m_{\ell\mu}$ of the lepton, $\ell$ (with $\ell=e,\mu$), from the $W$-boson decay and the muon, $\mu$, originating from the $b$-hadron decay is reconstructed, and a binned-template profile likelihood fit is performed to extract $m_t$. [...]
arXiv:2209.00583; CERN-EP-2020-018.- Geneva : CERN, 2023-06-05 - 54 p. - Published in : JHEP 2306 (2023) 019 Fulltext: 2209.00583 - PDF; document - PDF; External link: Previous draft version
3.
Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking / ATLAS Collaboration
The factor of four increase in the LHC luminosity, from $0.5\times 10^{34}\,\textrm{cm}^{-2}\textrm{s}^{-1}$ to $2.0\times 10^{34}\textrm{cm}^{-2}\textrm{s}^{-1}$, and the corresponding increase in pile-up collisions during the 2015-2018 data-taking period, presented a challenge for ATLAS to trigger on missing transverse momentum. The output data rate at fixed threshold typically increases exponentially with the number of pile-up collisions, so the legacy algorithms from previous LHC data-taking periods had to be tuned and new approaches developed to maintain the high trigger efficiency achieved in earlier operations. [...]
arXiv:2005.09554; CERN-EP-2020-050.- Geneva : CERN, 2020-08-19 - 53 p. Article from SCOAP3: PDF; Fulltext: PDF; External link: Previous draft version
4.
Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger / ATLAS Collaboration
The PreProcessor of the ATLAS Level-1 Calorimeter Trigger prepares the analogue trigger signals sent from the ATLAS calorimeters by digitising, synchronising and calibrating them to reconstruct transverse energy deposits, which are then used in further processing to identify event features. During the first long shutdown of the LHC from 2013 to 2014, the central components of the PreProcessor, the Multichip Modules, were replaced by upgraded versions that feature modern ADC and FPGA technology in order to ensure optimal performance in the high pile-up environment of LHC Run 2. [...]
arXiv:2005.04179; CERN-EP-2020-042.- Geneva : CERN, 2020-11-10 - 48 p. - Published in : JINST Fulltext: PDF; Fulltext from publisher: PDF; External link: Previous draft version
5.
Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at $\sqrt{s} = $ 8 TeV / CMS Collaboration
The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS Collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb$^{-1}$ for each experiment. [...]
arXiv:2005.03799; CMS-TOP-19-004; ATLAS-TOPQ-2018-02; CERN-EP-2020-012; CMS-TOP-19-004-003.- Geneva : CERN, 2020-08-12 - 63 p. - Published in : JHEP 2008 (2020) 051 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF; External links: Additional information for the analysis; CMS AuthorList
6.
Performance of the ATLAS muon triggers in Run 2 / ATLAS Collaboration
The performance of the ATLAS muon trigger system is evaluated with proton$-$proton ($pp$) and heavy-ion (HI) collision data collected in Run 2 during 2015-2018 at the Large Hadron Collider. It is primarily evaluated using events containing a pair of muons from the decay of $Z$ bosons to cover the intermediate momentum range between 25 GeV and 100 GeV. [...]
arXiv:2004.13447; CERN-EP-2020-031.- Geneva : CERN, 2020-09-14 - 60 p. Fulltext: PDF; External link: Previous draft version
7.
Search for direct production of electroweakinos in final states with missing transverse momentum and a Higgs boson decaying into photons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
A search for a chargino$-$neutralino pair decaying via the 125 GeV Higgs boson into photons is presented. The study is based on the data collected between 2015 and 2018 with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb$^{-1}$ of $pp$ collisions at a centre-of-mass energy of 13 TeV. [...]
arXiv:2004.10894; CERN-EP-2019-204.- Geneva : CERN, 2020-10-01 - 46 p. - Published in : JHEP 2010 (2020) 005 Article from SCOAP3: PDF; Fulltext: PDF; External link: Previous draft version
8.
Measurement of the Lund jet plane using charged particles in 13 TeV proton$-$proton collisions with the ATLAS detector / ATLAS Collaboration
The prevalence of hadronic jets at the LHC requires that a deep understanding of jet formation and structure is achieved in order to reach the highest levels of experimental and theoretical precision. There have been many measurements of jet substructure at the LHC and previous colliders, but the targeted observables mix physical effects from various origins. [...]
arXiv:2004.03540; CERN-EP-2020-030.- Geneva : CERN, 2020-06-05 - 21 p. - Published in : Phys. Rev. Lett. Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; External link: Previous draft version
9.
Measurements of the production cross-section for a $Z$ boson in association with $b$-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 $b$-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 35.6 fb$^{-1}$. Inclusive and differential cross-sections are measured for events containing a $Z$ boson decaying into electrons or muons and produced in association with at least one or at least two $b$-jets with transverse momentum $p_\mathrm{T}>$ 20 GeV and rapidity $|y| < 2.5$. [...]
arXiv:2003.11960; CERN-EP-2020-022.- Geneva : CERN, 2020-07-07 - 57 p. - Published in : JHEP 2007 (2020) 044 Article from SCOAP3: PDF; Fulltext: PDF; External link: Previous draft version
10.
Search for long-lived, massive particles in events with a displaced vertex and a muon with large impact parameter in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
A search for long-lived particles decaying into hadrons and at least one muon is presented. The analysis selects events that pass a muon or missing-transverse-momentum trigger and contain a displaced muon track and a displaced vertex. [...]
arXiv:2003.11956; CERN-EP-2019-219.- Geneva : CERN, 2020-08-14 - 30 p. - Published in : Phys. Rev. D 102 (2020) 032006 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF; External link: Previous draft version

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1 Schaeffer, J M
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