Project/scholarship details
- Project/scholarship ID
143069
- Reference
CERN/FIS-NUC/0005/2015
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
3599-PPCDT
- Funding amount
400,000.00 €
- Start date
2015-03-01
- End date
2017-02-28
Documents
Performance of the ATLAS trigger system in 2015
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationDuring 2015 the ATLAS experiment recorded 3.8fb−1 of proton–proton collision data at a centre-of-mass energy of 13TeV. The ATLAS trigger system is a crucial component of the experiment, responsible for selecting events of interest at a recording rate of approximately 1 kHz from up to 40 MHz of collisions. This paper presents a short overview of the changes to the trigger and data acquisition systems during the ...
Search for Heavy Higgs Bosons A/H Decaying to a Top Quark Pair in pp Collisions...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationA search for heavy pseudoscalar (A) and scalar (H) Higgs bosons decaying into a top quark pair (t¯t) has been performed with 20.3 fb−1 of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy √s=8 TeV. Interference effects between the signal process and standard model t¯t production, which are expected to distort the signal shape from a single p...
Measurement of inclusive and differential cross sections in the H → ZZ* → 4ℓ de...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationInclusive and differential fiducial cross sections of Higgs boson production in proton-proton collisions are measured in the H → ZZ* → 4ℓ decay channel. The proton-proton collision data were produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb−1. The inclusive fiducial cross section in...
Search for lepton-flavour-violating decays of the Higgs and Z bosons with the A...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationDirect searches for lepton flavour violation in decays of the Higgs and Z bosons with the ATLAS detector at the LHC are presented. The following three decays are considered: H→eτ, H→μτ, and Z→μτ. The searches are based on the data sample of proton–proton collisions collected by the ATLAS detector corresponding to an integrated luminosity of 20.3 fb−1 at a centre-of-mass energy of √s=8 TeV. No significant excess...
Measurement of detector-corrected observables sensitive to the anomalous produc...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationObservables sensitive to the anomalous production of events containing hadronic jets and missing momentum in the plane transverse to the proton beams at the Large Hadron Collider are presented. The observables are defined as a ratio of cross sections, for events containing jets and large missing transverse momentum to events containing jets and a pair of charged leptons from the decay of a Z/γ∗ boson. This defi...
Measurement of forward-backward multiplicity correlations in lead-lead, proton-...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationTwo-particle pseudorapidity correlations are measured in √sNN=2.76TeVPb+Pb, √sNN=5.02TeVp+Pb, and √s=13TeVpp collisions at the Large Hadron Collider (LHC), with total integrated luminosities of approximately 7μb−1, 28 nb−1, and 65 nb−1, respectively. The correlation function CN(η1,η2) is measured as a function of event multiplicity using charged particles in the pseudorapidity range |η|<2.4. The correlation fun...
Jet reconstruction and performance using particle flow with the ATLAS Detector
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationThis paper describes the implementation and performance of a particle flow algorithm applied to 20.2 fb−1 of ATLAS data from 8 TeV proton–proton collisions in Run 1 of the LHC. The algorithm removes calorimeter energy deposits due to charged hadrons from consideration during jet reconstruction, instead using measurements of their momenta from the inner tracker. This improves the accuracy of the charged-hadron m...
Measurement of W boson angular distributions in events with high transverse mom...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationThe W boson angular distribution in events with high transverse momentum jets is measured using data collected by the ATLAS experiment from proton–proton collisions at a centre-of-mass energy View the MathML sources=8 TeV at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−120.3 fb−1. The focus is on the contributions to W+jetsW+jets processes from real W emission, which is achiev...
Measurements of top-quark pair to Z-boson cross-section ratios at √s=13 , 8, 7 ...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationRatios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of √s=13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given √s for the two processes and at different √s for each process, as well as double ratios of the two processes at different √s, are evaluated. The ratios are constructed using previously publi...
Search for supersymmetry in events with b-tagged jets and missing transverse mo...
Onofre, A.; Castro, Nuno Filipe; ATLAS CollaborationA search for the supersymmetric partners of the Standard Model bottom and top quarks is presented. The search uses 36.1 fb(-1) of pp collision data at root s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Direct production of pairs of bottom and top squarks ((b) over bar (1) and (t) over bar (1)) is searched for in final states with b-tagged jets and missing transverse momentum. Distin...
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