30,254 research outputs found
ATLAS Collaboration Maps
No full textMaps showing the institution countries of the ATLAS Collaboration and the nationalities of ATLAS members. For PDF versions of these maps, please refer to links below. (Collaboration Map updated November 2024, Nationalities Map updated June 2022
Measurements of single top quark production processes with the ATLAS and CMS experiments
No full textThis report contains a brief summary of the latest single top quark production cross-section measurements performed by the ATLAS and CMS
collaborations on pp collisions collected during Run 2 of the LHC. Various results for t−channel, s−channel and W associated single top production
are discussed. Particular attention is given to the main techniques used by the analyses and the main systematic uncertainties limiting these precise measurements
Performance of the reconstruction of large impact parameter tracks in the inner detector of ATLAS
No full textSearches for long-lived particles (LLPs) are among the most promising avenues for discovering physics beyond the Standard Model at the Large Hadron Collider (LHC). However, displaced signatures are notoriously difficult to identify due to their ability to evade standard object reconstruction strategies. In particular, the ATLAS track reconstruction applies strict pointing requirements which limit sensitivity to charged particles originating far from the primary interaction point. To recover efficiency for LLPs decaying within the tracking detector volume, the ATLAS Collaboration employs a dedicated large-radius tracking (LRT) pass with loosened pointing requirements. During Run 2 of the LHC, the LRT implementation produced many incorrectly reconstructed tracks and was therefore only deployed in small subsets of events. In preparation for LHC Run 3, ATLAS has significantly improved both standard and large-radius track reconstruction performance, allowing for LRT to run in all events. This development greatly expands the potential phase-space of LLP searches and streamlines LLP analysis workflows. This paper will highlight the above achievement and report on the readiness of the ATLAS detector for track-based LLP searches in Run 3. © 2023, The Author(s)
ATLAS Overview Week in Marrakech in 2013
No full textATLAS Overview Week in Marrakech in 2013 Image supporting ATLAS Blog - 31 July 2015 meetings collaboration
Measurement of the flavour composition of dijet events in pp collisions at s√=7 TeV with the ATLAS detector
No full textThis paper describes a measurement of the flavour composition of dijet events produced in pp collisions at s√=7~TeV using the ATLAS detector. The measurement uses the full 2010 data sample, corresponding to an integrated luminosity of 39 pb−1. Six possible combinations of light, charm and bottom jets are identified in the dijet events, where the jet flavour is defined by the presence of bottom, charm or solely light flavour hadrons in the jet. Kinematic variables, based on the properties of displaced decay vertices and optimised for jet flavour identification, are used in a multidimensional template fit to measure the fractions of these dijet flavour states as functions of the leading jet transverse momentum in the range 40 GeV to 500 GeV and jet rapidity |y|<2.1. The fit results agree with the predictions of leading- and next-to-leading-order calculations, with the exception of the dijet fraction composed of bottom and light flavour jets, which is underestimated by all models at large transverse jet momenta. The ability to identify jets containing two b-hadrons, originating from e.g. gluon splitting, is demonstrated. The difference between bottom jet production rates in leading and subleading jets is consistent with the next-to-leading-order predictions
Search for a new gauge boson via the process in collisions at with the ATLAS detector
No full textA search for a new Z′ gauge boson predicted by Lμ-Lτ models, based on charged-current Drell-Yan production, pp→W±(∗)→Z′μ±ν→μ±μ μ±ν, is presented. The data sample used corresponds to an integrated luminosity of 140 fb-1 of proton-proton collisions at s=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The search examines a final state of 3μ plus large missing transverse momentum. Upper limits are set on the Z′ production cross section times branching ratio in the mass range of 5-81 GeV. After combining with the previous Z′ search using the neutral-current Drell-Yan production with a 4μ final state, the most stringent exclusion limits to date are achieved in the parameter space of the Z′ coupling strength and mass. © 2024 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the 'https://creativecommons.org/licenses/by/4.0/'Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3
ATLAS Experiment: Measurements of the W boson mass
No full textOn 23 March 2023, the ATLAS Collaboration released an improved ATLAS measurement of the W boson mass is in line with the Standard Model of particle physics
Search for squarks and gluinos in final states with one ivsolated lepton, jets, and missing transverse momentum at root s = 13 TeV with the ATLAS detector (vol 81, 600, 2021)
No full textIn this article the title was incorrectly given as ‘Search for squarks and gluinos in final states with one isolated lepton, jets, and missing transverse momentum at √s = 13 with the ATLAS detector’ but should have been ‘Search for squarks and gluinos in final states with one isolated lepton, jets, and missing transverse momentum at √s = 13 TeV with the ATLAS detector’. The original article has been corrected. © 2021, CERN for the benefit of ATLAS Collaboration
ATLAS events at 13 TeV - 2016 conferences
No full textThe ATLAS collaboration has released in 2016 an impressive number of results using data collected at 13 TeV. Some of the corresponding event displays are grouped here for media and press. The reference to the conference note is given in the caption. Read more on ATLAS results with the links provided below
ATLAS Run 2 searches for electroweak production of supersymmetric particles interpreted within the pMSSM
No full textA summary of the constraints from searches performed by the ATLAS collaboration for the electroweak production of charginos and neutralinos is presented. Results from eight separate ATLAS searches are considered, each using 140 fb−1 of proton-proton data at a centre-of-mass energy of s = 13 TeV collected at the Large Hadron Collider during its second data-taking run. The results are interpreted in the context of the 19-parameter phenomenological minimal supersymmetric standard model, where R-parity conservation is assumed and the lightest supersymmetric particle is assumed to be the lightest neutralino. Constraints from previous electroweak, flavour and dark matter related measurements are also considered. The results are presented in terms of constraints on supersymmetric particle masses and are compared with limits from simplified models. Also shown is the impact of ATLAS searches on parameters such as the dark matter relic density and the spin-dependent and spin-independent scattering cross-sections targeted by direct dark matter detection experiments. The Higgs boson and Z boson ‘funnel regions’, where a low-mass neutralino would not oversaturate the dark matter relic abundance, are almost completely excluded by the considered constraints. Example spectra for non-excluded supersymmetric models with light charginos and neutralinos are also presented. © The Author(s) 2024
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