Project/scholarship details


  • 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


Measurements of ψ(2S) and X(3872) → J/ψπ + π − production in pp collisions at √...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and psi(2S), in the decay mode J/psi pi (+) pi (-), measured using 11.4 fb(-1) of pp collisions at root s = 8 Tev by the ATLAS detector at the LHC. The ratio of cross-sections X(3872)/psi(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X...


Precision measurement and interpretation of inclusive W+, W− and Z/γ∗ productio...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

High-precision measurements by the ATLAS Collaboration are presented of inclusive W+→ℓ+ν, W−→ℓ−ν¯ and Z/γ∗→ℓℓ (ℓ=e,μ) Drell–Yan production cross sections at the LHC. The data were collected in proton–proton collisions at s√=7TeV with an integrated luminosity of 4.6fb−1. Differential W+ and W− cross sections are measured in a lepton pseudorapidity range |ηℓ|<2.5. Differential Z/γ∗ cross sections are measured as ...


Searches for the Zγ decay mode of the Higgs boson and for new high-mass resonan...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

This article presents searches for the Zγ decay of the Higgs boson and for narrow high-mass resonances decaying to Zγ, exploiting Z boson decays to pairs of electrons or muons. The data analysis uses 36.1 fb−1 of pp collisions at s√=13 recorded by the ATLAS detector at the CERN Large Hadron Collider. The data are found to be consistent with the expected Standard Model background. The observed (expected — assumi...


Measurements of charge and CP asymmetries in b-hadron decays using top-quark ev...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

Same- and opposite-sign charge asymmetries are measured in lepton+jets tt¯ events in which a b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 fb−1 from proton-proton collisions at a centre-of-mass energy of s√=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. The charge asymmetries are based on the charge of the lepton from...


Measurements of top-quark pair differential cross-sections in the lepton plus j...

Onofre, A.; Castro, Nuno Filipe; ATLAS Collaboration

Measurements of differential cross-sections of top-quark pair production in fiducial phase-spaces are presented as a function of top-quark and t (t) over bar system kinematic observables in proton-proton collisions at a centre-of-mass energy of root s = 13TeV. The data set corresponds to an integrated luminosity of 3.2 fb(-1), recorded in 2015 with the ATLAS detector at the CERN Large Hadron Collider. Events wi...


Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton–prot...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of s√=8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measureme...


Search for lepton-flavour-violating decays of the Higgs and Z bosons with the A...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

Direct 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 Collaboration

Observables 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...


Performance of the ATLAS track reconstruction algorithms in dense environments ...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

With the increase in energy of the Large Hadron Collider to a centre-of-mass energy of 13 TeV for Run 2, events with dense environments, such as in the cores of high-energy jets, became a focus for new physics searches as well as measurements of the Standard Model. These environments are characterized by charged-particle separations of the order of the tracking detectors sensor granularity. Basic track quantiti...


Studies of Z gamma production in association with a high-mass dijet system in p...

Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration

The production of a Z boson and a photon in association with a high-mass dijet system is studied using 20.2 fb−1 of proton-proton collision data at a centre-of-mass energy of s√=8 TeV recorded with the ATLAS detector in 2012 at the Large Hadron Collider. Final states with a photon and a Z boson decaying into a pair of either electrons, muons, or neutrinos are analysed. Electroweak and total pp → Zγjj cross-sect...

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