1,363 research outputs found
6th September 2011 - Argentine Minister of Science, Technology and Innovation J. L. Barañao signing the guest book with CERN Director-General R. Heuer.
No full textIn the ATLAS Visitors Centre with Collaboration Spokesperson F. Gianotti and National Contact Physicist M. T. Dova. ATLAS Collaboration M. Mikenberg present. CERN-HI-1109229 24: In the CERN Control centre, from left to right: First Secretary at the Permanent Mission R. Bardoneschi, National Contact Physicist M.T. Dova, CERN Adviser for Latin America J. Salicio Diez, Minister Barañao and Beams Operation Group M. Benedikt
Proposal of the TBN Classification of Thoracic Anomalies and Treatment Algorithm for Poland Syndrome
No full textBACKGROUND:
Poland syndrome is a congenital deformity characterized by unilateral anomalies of pectoralis muscles, breast, nipple, axillary fold, subcutaneous tissue, ribs, and upper limb. The thoracic anomaly, which is the pathognomonic malformation of Poland syndrome, presents a wide phenotype variability and has been classified by different authors. However, these classifications do not include all the possible phenotypes of Poland syndrome. The aim of this study is to propose a simple classification of the whole spectrum of thoracic anomalies and a treatment algorithm that could have a practical value for determining the surgical approach.
METHODS:
Since 2008, 100 patients have been evaluated by the same plastic surgical team at San Martino Hospital-IST and Istituto Gaslini of Genoa, Italy, using the thorax, breast, nipple-areola complex (TBN) classification. Thoracic anomalies were classified as follows: thorax (T), from T1 (muscle defect only) to T4 (complex deformity with rib and sternal involvement); breast (B), in B1 (hypoplasia) or B2 (amastia); and nipple-areola complex (N), from N1 (dislocation <2 cm) to N3 (athelia).
RESULTS:
The most frequent thoracic anomalies were T1 (47 percent) and N2 (74 percent), whereas in female patients, B1 was more frequent than B2. The surgical approach to breast and pectoral reconstruction was based not only on the patient's age and sex, but also on the type of anomaly according to the TBN classification. In particular, a two-step approach with tissue expanders was required in N2 and N3 cases, whereas in N1 patients a single step was sufficient.
CONCLUSION:
The TBN classification can be a useful tool for surgical decision-making according to each specific thoracic anomaly
Search for top quark decays t → qH with H → γγ using the ATLAS detector
No full textA search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type (c, u) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb-1 at √ = 7TeV and 20.3fb-1 at √ = 8TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to qH and the other decays to bW. Both the hadronic and the leptonic decay modes of the W boson are used. No significant signal is observed and an upper limit is set on the t → qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination λtcH 2 + λtuH 2 is 0.17
Measurement of the production cross section in the + jets final state in collisions at TeV using the ATLAS detector
No full textSee paper for full list of authors - 37 pages in total, author list starts at page 21, 2 figures, 6 tables, submitted to Phys. Rev. D, all figures and tables including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-18/International audienceA measurement of the inclusive production cross section in the final state using only the hadronic decays of the lepton is presented. The measurement is performed using 20.2 fb of proton-proton collision data recorded at a center-of-mass energy of TeV with the ATLAS detector at the Large Hadron Collider. The cross section is measured via a counting experiment by imposing a set of selection criteria on the identification and kinematic variables of the reconstructed particles and jets, and on event kinematic variables and characteristics. The production cross section is measured to be pb, which is in agreement with the measurements in other final states and the theoretical predictions at this center-of-mass energy
Search for a supersymmetric partner to the top quark in final states with jets and missing transverse momentum at root s=7 TeV with the ATLAS detector
No full textExtent: 18p.A search for direct pair production of supersymmetric top squarks (t(1)) is presented, assuming the t(1) decays into a top quark and the lightest supersymmetric particle, χ(1)(0), and that both top quarks decay to purely hadronic final states. A total of 16 (4) events are observed compared to a predicted standard model background of 13.5(-3.6)(+3.7)(4.4(-1.3)(+1.7)) events in two signal regions based on ∫Ldt = 4.7 fb(-1) of pp collision data taken at sqrt[s] = 7 TeV with the ATLAS detector at the LHC. An exclusion region in the t(1) versus χ(1)(0) mass plane is evaluated: 370<m(t)(1)}<465 GeV is excluded for m(χ)(1)(0) ~ 0 GeV while m(t)(1) = 445 GeV is excluded for m(χ)(1)(0) ≤ 50 GeV.G. Aad ... P. Jackson ... N. Soni ... et al. (ATLAS Collaboration
Cosmic-ray physics and the Pierre Auger Observatory
No full textOne of the foremost issues in astrophysics today is that of the origin of ultrahigh- energy cosmic rays. The Pierre Auger Observatory is a broadly based international effort to make a high-statistics study of the upper-end of the cosmic-ray spectrum. Auger is the rst experiment designed to work in a hybrid detection mode. It consists of an array of 1600 particle detectors spread over 3000 km2 and four uorescence telescopes placed on the boundaries of the surface array. Recent measurements from Auger of the energy spectrum and mass composition above 1018 eV are described
Measurement of the production cross-section in the lepton+jets channel at TeV with the ATLAS experiment
No full textThe production cross-section is measured in the lepton+jets
channel using protonproton collision data at a centre-of-mass energy of
TeV collected with the ATLAS detector at the LHC. The dataset
corresponds to an integrated luminosity of 139 fb. Events with exactly
one charged lepton and four or more jets in the final state, with at least one
jet containing -hadrons, are used to determine the production
cross-section through a profile-likelihood fit. The inclusive cross-section is
measured to be with a relative
uncertainty of 4.6%. The result is consistent with theoretical calculations at
next-to-next-to-leading order in perturbative QCD
A measurement of τ polarization in Z° decays
No full textThe polarization of τ leptons produced m e+e- + τ +τ-(y) is measured using a sample of 8977 z+r - paars collected near the peak of the Z ° resonance A polanzatlon of -0 132 4- 0 026 (stat) 4- 0 021 (syst) is determined Thts corresponds to a ratm of the vector to the axial-vector couphng constants of the z lepton to the weak neutral current of T gv/gAeff = 0 0694-0 017 This leads to a value of the effective sm 2 0w at the Z° resonance of sin 2 0eff = 0 23264-0 0043Facultad de Ciencias Exacta
A obrigação tributária no imposto sobre produtos industrializados
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Florianópolis, 1980
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