Browsing by Issue Date, starting with "2014-11-04"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Análise do impacto de uma estratégia de internacionalização de uma empresa portuguesa do sector do papel, cartão e plásticoPublication . Vega, Ricardo Diogo Sousa; Fonseca, José Manuel da
- Measurement of the cross-section of high transverse momentum vector bosons reconstructed as single jets and studies of jet substructure in $pp$ collisions at ${\sqrt{s}}$ = 7 TeV with the ATLAS detectorPublication . ATLAS collaboration (2856 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Cantrill, Robert; Carvalho, João; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Do Valle Wemans, André; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Lopes, Lourenco; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Marques, Carlos; Onofre, António; Palma, Alberto; Pedro, Rute; Pina, João Antonio; Pinto, Belmiro; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, HelmutThis paper presents a measurement of the cross-section for high transverse momentum W and Z bosons produced in pp collisions and decaying to all-hadronic final states. The data used in the analysis were recorded by the ATLAS detector at the CERN Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=7\,{\rm Te}{\rm V}$ and correspond to an integrated luminosity of $4.6\,{\rm f}{{{\rm b}}^{-1}}$. The measurement is performed by reconstructing the boosted W or Z bosons in single jets. The reconstructed jet mass is used to identify the W and Z bosons, and a jet substructure method based on energy cluster information in the jet centre-of-mass frame is used to suppress the large multi-jet background. The cross-section for events with a hadronically decaying W or Z boson, with transverse momentum ${{p}_{{\rm T}}}\gt 320\,{\rm Ge}{\rm V}$ and pseudorapidity $|\eta |\lt 1.9$, is measured to be ${{\sigma }_{W+Z}}=8.5\pm 1.7$ pb and is compared to next-to-leading-order calculations. The selected events are further used to study jet grooming techniques.
- Precision measurements of the Top quark with the ATLAS experimentPublication . Amor Dos Santos, SusanaThe top quark is the heaviest known fundamental particle. As it is the only quark that decays before it hadronizes, this allows the unique opportunity to probe the properties of bare quarks. In this paper the most recent precision measurements of the top quark properties, performed by the ATLAS experiment using data from proton-proton collisions at p s = 8 TeV and p s = 7 TeV are reviewed. The top pair and single top production cross-sections, including differential distributions, alongside some top quark properties measurements are shown. Interpretations in terms of limits on physics beyond the standard model and searches for new physics using top quarks will also be presented