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Even bigger data : preparing for the LHC/ATLAS upgrade
Oliveira, Vítor; Pina, António Manuel Silva; Castro, N.; Onofre, A.; Veloso, F.The Large Hadron Collider’s (LHC) experiments’ data volume is expected to grow one order of magnitude following the machine operation conditions upgrade in 2013-2014. The challenge to the scientific results of our team is: i) how to deal with a 10-fold increase in the data volume that must be processed for each analysis, while ii) supporting the increase in the complexity of the analysis applications, iii) redu...
ATLAS sensitivity to Wtb anomalous couplings in top quark decays
Aguilar-Saavedra, J.A.; Carvalho, J.; Castro, N.; Onofre, A.; Veloso, F.Abstract We study the sensitivity of the ATLAS experiment to Wtb anomalous couplings in top pair production with semileptonic decay, pp?tt̄?W+bW-b̄ with one of the W bosons decaying leptonically and the other hadronically. Several observables are examined, including the W helicity fractions and new quantities recently introduced, such as the ratios of helicity fractions and some angular asymmetries d...
Study of ATLAS sensitivity to FCNC top decays
Carvalho, J.; Castro, N.; Chikovani, L.; Djobava, T.; Dodd, J.; McGrath, S.; Onofre, A.; Parsons, J.; Veloso, F.Abstract The ATLAS experiment sensitivity to top quark flavour changing neutral current (FCNC) decays was studied at LHC using tt̄ events. While one of the top quarks is expected to follow the dominant Standard Model decay t?bW, the other decays through a FCNC channel, i.e. t?Zu(c), t??u(c) or t?gu(c). Different types of analyses, applied to each FCNC decay mode, were compared. The FCNC branching ratio sensiti...
Probing anomalous Wtb couplings in top pair decays
Aguilar-Saavedra, J.A.; Carvalho, J.; Castro, N.; Onofre, A.; Veloso, F.Abstract We investigate several quantities, defined in the decays of top quark pairs, which can be used to explore non-standard Wtb interactions. Two new angular asymmetries are introduced in the leptonic decay of top (anti)quarks. Both are very sensitive to anomalous Wtb couplings, and their measurement allows for a precise determination of the W helicity fractions. We also examine other angular and energy as...
Serum immunoglobulin levels in ulcerative colitis and Crohn's disease.
Veloso, F. Tavarela; Departamentos de Gastrenterologia e Imunologia. Hospital Universitário de S. João. Porto.As concentrações sericás de IgG, IgA, e JgM foram determinadas em 50 doentes com doença inflamatória não especifica do intestino (32 doentes com colite ulcerosa e 18 com doença de Crohn). Em 60% dos doentes foi também determinada a concentração de IgE. Os resultados foram correlacionados com os seguintes aspectos clínicos: actividade, localização e duração da doença, terapêutica e manifestações extra-intestinai...
Hyperosmolarity and non-ketotic hyperglycemia.
Veloso, F. Tavarela; Serviço de Clínica Médica. Faculdade de Medicina do Porto. PortoDescrevem-se oito casos da síndrome de hiperosmolalidade com hiperglicemia grave não cetónica, na ausência de estado de coma. No início da terapêutica, observaram-se os seguintes exames laboratoriais: glicemia 1127 (700-1700) mg/100 ml; osmolalidade 364 (326--376) mOsm/Kg; sódio 136 (112-148) mEq/L; potássio 4,2 (1,9-5,7) mEq/L; e ureia 55 (19-110) mg/100 ml; gIicosúria ♦♦♦♦ e cetonúria O/+. O valor mais elevad...
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