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
Search for pair production of Higgs bosons in the bb¯bb¯ final state using prot...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationA search for Higgs-boson pair production in the bb¯bb¯ final state is carried out with 3.2 fb−1 of proton-proton collision data collected at s√=13 TeV with the ATLAS detector. The data are consistent with the estimated background and are used to set upper limits on the production cross section of Higgs-boson pairs times branching ratio to bb¯bb¯ for both nonresonant and resonant production. In the case of res...
Search for metastable heavy charged particles with large ionization energy loss...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationThis paper presents a search for massive charged long-lived particles produced in pp collisions at s√=13 TeV at the LHC using the ATLAS experiment. The data set used corresponds to an integrated luminosity of 3.2 fb−1. Many extensions of the Standard Model predict the existence of massive charged long-lived particles, such as R-hadrons. These massive particles are expected to be produced with a velocity signi...
Search for dark matter produced in association with a hadronically decaying vec...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationA search is presented for dark matter produced in association with a hadronically decaying W or Z boson using 3.2 fb−1 of pp collisions at View the MathML sources=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with a hadronic jet compatible with a W or Z boson and with large missing transverse momentum are analysed. The data are consistent with the Standard Model predictions and are ...
Test of CP invariance in vector-boson fusion production of the Higgs boson usin...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationA test of CP invariance in Higgs boson production via vector-boson fusion using the method of the Optimal Observable is presented. The analysis exploits the decay mode of the Higgs boson into a pair of τ leptons and is based on 20.3 fb−1 of proton–proton collision data at √s = 8 TeV collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak...
Measurement of the total cross section from elastic scattering in pp collisions...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationA measurement of the total pp cross section at the LHC at s√=8 TeV is presented. An integrated luminosity of 500 μb−1 was accumulated in a special run with high-β⋆ beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the...
Measurements of top-quark pair differential cross-sections in the lepton+jets c...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationMeasurements of normalized differential cross-sections of top-quark pair production are presented as a function of the top-quark, tˉt system and event-level kinematic observables in proton–proton collisions at a centre-of-mass energy of √s=8TeV. The observables have been chosen to emphasize the tˉt production process and to be sensitive to effects of initial- and final-state radiation, to the different parton d...
Measurements of four-lepton production in pp collisions at √s = 8 TeV with the ...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationThe four-lepton (4ℓ , ℓ=e,μℓ=e,μ) production cross section is measured in the mass range from 80 to 1000 GeV using 20.3 fb−1 of data in pp collisions at View the MathML sources=8 TeV collected with the ATLAS detector at the LHC. The 4ℓ events are produced in the decays of resonant Z and Higgs bosons and the non-resonant ZZ continuum originating from View the MathML sourceqq¯, gg, and qg initial states. A total ...
Measurement of the charged-particle multiplicity inside jets from √s = 8 TeV pp...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationThe number of charged particles inside jets is a widely used discriminant for identifying the quark or gluon nature of the initiating parton and is sensitive to both the perturbative and non-perturbative components of fragmentation. This paper presents a measurement of the average number of charged particles with pT>500MeV inside high-momentum jets in dijet events using 20.3 fb−1 of data recorded with the ATLAS...
Search for magnetic monopoles and stable particles with high electric charges i...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationA search for highly ionizing particles produced in proton-proton collisions at 8 TeV center-of-mass energy is performed by the ATLAS Collaboration at the CERN Large Hadron Collider. The data set used corresponds to an integrated luminosity of 7.0 fb−1. A customized trigger significantly increases the sensitivity, permitting a search for such particles with charges and energies beyond what was previously access...
A new method to distinguish hadronically decaying boosted Z bosons from W boson...
Onofre, A.; Castro, Nuno Filipe Silva Fernandes; ATLAS CollaborationThe distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a technique for further differentiating Z bosons from W bosons. The variables used are jet mass, jet charge, and a b-t...
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