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    305 research outputs found

    ATLAS Liquid Argon Calorimeter Phase-II Upgrade Technical Design Report

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    AIR Universita degli studi di Milano

    Search for a CP-odd Higgs boson decaying to Zh in pp collisions at root s=8 TeV with the ATLAS detector

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    See paper for full list of authors – 13 pages plus author list + cover pages (30 pages total), 5 figures, 2 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-06/International audienceA search for a heavy, CP-odd Higgs boson, AA, decaying into a ZZ boson and a 125 GeV Higgs boson, hh, with the ATLAS detector at the LHC is presented. The search uses proton--proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb−1^{-1}. Decays of CP-even hh bosons to ττ\tau\tau or bbbb pairs with the ZZ boson decaying to electron or muon pairs are considered, as well as h→bbh \rightarrow bb decays with the ZZ boson decaying to neutrinos. No evidence for the production of an AA boson in these channels is found and the 95% confidence level upper limits derived for \sigma (gg\rightarrow A) \times \mbox{BR}(A \rightarrow Zh) \times \mbox{BR}(h \rightarrow f\bar{f}) are 0.098--0.013 pb for f=τf=\tau and 0.57--0.014 pb for f=bf=b in a range of mA=m_A = 220--1000 GeV. The results are combined and interpreted in the context of two-Higgs doublet models
    Tomsk State University Repository
    Directory of Open Access Journals
    Edinburgh Research Explorer
    Digitala Vetenskapliga Arkivet - Academic Archive On-line
    Diposit Digital de Documents de la UAB
    International Migration, Integration and Social Cohesion online publications
    Archivio Istituzionale della Ricerca- Università del Salento
    University of Melbourne Institutional Repository
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    Archivio della ricerca - Università degli studi di Napoli "Parthenope"
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    Archivio istituzionale della ricerca - Università degli Studi di Udine
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    Publisher Correction: Observation of triple J/ψ meson production in proton-proton collisions

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    In the version of this article initially published, the first affiliation—Yerevan Physics Institute, Yerevan, Armenia—was missing from the list of author affiliations and has now been inserted in the HTML and PDF versions of the articl
    Politecnio die Bari - Catalogo di prodotti della Ricerca
    Archivio istituzionale della ricerca - Università di Bari
    Archivio della ricerca- Università di Roma La Sapienza

    Evidence for Electroweak Production of W(+/-)W(+/-)jj in pp Collisions at root s=8 TeV with the ATLAS Detector

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    Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.This Letter presents the first study of W±W±jj, same-electric-charge diboson production in association with two jets, using 20.3 fb-1 of proton-proton collision data at √s=8 TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with two reconstructed same-charge leptons (e±e±, e±μ±, and μ±μ±) and two or more jets are analyzed. Production cross sections are measured in two fiducial regions, with different sensitivities to the electroweak and strong production mechanisms. First evidence for W±W±jj production and electroweak-only W±W±jj production is observed with a significance of 4.5 and 3.6 standard deviations, respectively. The measured production cross sections are in agreement with standard model predictions. Limits at 95% confidence level are set on anomalous quartic gauge couplings
    Archivio istituzionale della ricerca - Università di Trieste
    Archivio istituzionale della ricerca - Università degli Studi di Udine
    Archivio della Ricerca - Università di Pisa
    ePubs: the open archive for STFC research publications

    Study of excited <tex>\Lambda_{b}^{0}</tex>statesdecayingto<tex>Λb0π+π−</tex> states decaying to <tex>\Lambda_{b}^{0}\pi^{+}\pi^{-}</tex> in proton-proton collisions at 1as=13TeV

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    Abstract: A study of excited Lambda(0)(b) baryons is reported, based on a data sample collected in 2016-2018 with the CMS detector at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of up to 140fb(-1). The existence of four excited Lambda(0)(b) states: Lambda(0)(b) (5912)(0), Lambda(0)(b) (5920)(0), Lambda(0)(b) (6146)(0), and Lambda(0)(b) (6152)(0) in the Lambda(0)(b)pi(+)pi(-) mass spectrum is confirmed, and their masses are measured. The Lambda(0)(b)pi(+)pi(-) mass distribution exhibits a broad excess of events in the region of 6040-6100 MeV, whose origin cannot be discerned with the present data. (C) 2020 The Author(s). Published by Elsevier B.V
    Institutional Repository Universiteit Antwerpen

    Measurement of electroweak WZ boson production and search for new physics in WZ + two jets events in pp collisions at s=13TeV

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    A measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ→ℓνℓ′ℓ′, where ℓ,ℓ′=e,μ. The analysis is based on a data sample of proton-proton collisions at s=13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb−1. The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented. © 2019 The Author(s
    Pergamos : Unified Institutional Repository / Digital Library Platform of the National and Kapodistrian University of Athens

    Measurement of the top quark mass in the t(t)over-bar -> dilepton channel from root s=8TeVATLAS data

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    The top quark mass is measured in the t (t) over bar -> dilepton channel (lepton= e, mu) using ATLAS data recorded in the year 2012 at the LHC. The data were taken at a proton-proton centre-of-mass energy of root s = 8 TeV and correspond to an integrated luminosity of about 20.2 fb(-1). Exploiting the template method, and using the distribution of invariant masses of lepton-b-jetpairs, the top quark mass is measured to be m(top) = 172.99 +/- 0.41(stat)+/- 0.74(syst) GeV, with a total uncertainty of 0.84 GeV. Finally, acombination with previous ATLAS m(top) measurements from root s = 7 TeV data in the t (t) over bar -> dilepton and t (t) over bar -> lepton + jets channels results in m(top) = 172.84 +/- 0.34(stat)+/- 0.61(syst) GeV, with a total uncertainty of 0.70 GeV. (C) 2016 The Author. Published by Elsevier B.V
    Gazi University Research Information System

    Measurement of the W+ W- production cross section in pp collisions at a centre-of-mass energy of root s=13 TeV with the ATLAS experiment

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    The production of opposite-charge W-boson pairs in proton-proton collisions at root s = 13 TeV is measured using data corresponding to 3.16 fb(-1) of integrated luminosity collected by the ATLAS detector at the CERN Large Hadron Collider in 2015. Candidate W-boson pairs are selected by identifying their leptonic decays into an electron, a muon and neutrinos. Events with reconstructed jets are not included in the candidate event sample. The cross-section measurement is performed in a fiducial phase space close to the experimental acceptance and is compared to theoretical predictions. Agreement is found between the measurement and the most accurate calculations available. (C) 2017 The Author. Published by Elsevier B.V
    Gazi University Research Information System

    Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at <tex>\sqrt{s_{NN}}$</tex>=5.02 TeV

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    Abstract: Evidence for the light-by-light scattering process, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of 390 mu b(-1) recorded by the CMS experiment at the LHC. Light-by-light scattering processes are selected in events with two photons exclusively produced, each with transverse energy E-T(gamma) > 2 GeV, pseudorapidity vertical bar eta(gamma)vertical bar 5 GeV, diphoton transverse momentum p(T)(gamma gamma) gamma gamma) = 120 +/- 46(stat) +/- 28(syst) +/- 12(theo) nb, is consistent with the standard model prediction. The m(gamma gamma) distribution is used to set new exclusion limits on the production of pseudoscalar axion-like particles, via the gamma gamma -> a -> gamma gamma process, in the mass range m(a) = 5-90 GeV. (C) 2019 The Author(s). Published by Elsevier B.V
    Institutional Repository Universiteit Antwerpen

    A Deep Neural Network for Simultaneous Estimation of b Jet Energy and Resolution

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    We describe a method to obtain point and dispersion estimates for the energies of jets arising from b quarks produced in proton–proton collisions at an energy of s=13TeV at the CERN LHC. The algorithm is trained on a large sample of simulated b jets and validated on data recorded by the CMS detector in 2017 corresponding to an integrated luminosity of 41 fb-1. A multivariate regression algorithm based on a deep feed-forward neural network employs jet composition and shape information, and the properties of reconstructed secondary vertices associated with the jet. The results of the algorithm are used to improve the sensitivity of analyses that make use of b jets in the final state, such as the observation of Higgs boson decay to b b ¯. © 2020, The Author(s)
    Pergamos : Unified Institutional Repository / Digital Library Platform of the National and Kapodistrian University of Athens
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