Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at root s=8 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Search for excited quarks in the gamma plus jet final state in proton-proton collisions at root s=8 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Measurement of the t(t)over-bar production cross section in pp collisions at root s=8 TeV in dilepton final states containing one tau lepton

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at v root s=8 TeV

A search for pair production of third-generation scalar leptoquarks and supersymmetric top quark partners, top squarks, in final states involving tau leptons and bottom quarks is presented. The search uses events from a data sample of proton-proton collisions corresponding to an integrated luminosity of 19.7 fb(-1), collected with the CMS detector at the LHC with root s = 8 TeV. The number of observed events is found to be in agreement with the expected standard model background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition, this mass limit applies directly to top squarks decaying via an R-parity violating coupling. lambda(') (333). The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the Rparity violating coupling. lambda(')(3jk). Each top squark decays to a tau lepton, a bottom quark, and two light quarks. Top squarks in this model with masses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date, and this is the first search for top squarks decaying via. lambda(')(3jk). (C) 2014 The Authors. Published by Elsevier B. V.

Alignment of the CMS tracker with LHC and cosmic ray data

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Description and performance of track and primary-vertex reconstruction with the CMS tracker

A description is provided of the software algorithms developed for the CMS tracker both for reconstructing charged-particle trajectories in proton-proton interactions and for using the resulting tracks to estimate the positions of the LHC luminous region and individual primary-interaction vertices. Despite the very hostile environment at the LHC, the performance obtained with these algorithms is found to be excellent. For t (t) over bar events under typical 2011 pileup conditions, the average track-reconstruction efficiency for promptly-produced charged particles with transverse momenta of p(T) > 0.9GeV is 94% for pseudorapidities of vertical bar eta vertical bar < 0.9 and 85% for 0.9 < vertical bar eta vertical bar < 2.5. The inefficiency is caused mainly by hadrons that undergo nuclear interactions in the tracker material. For isolated muons, the corresponding efficiencies are essentially 100%. For isolated muons of p(T) = 100GeV emitted at vertical bar eta vertical bar < 1.4, the resolutions are approximately 2.8% in p(T), and respectively, 10 m m and 30 mu m in the transverse and longitudinal impact parameters. The position resolution achieved for reconstructed primary vertices that correspond to interesting pp collisions is 10-12 mu m in each of the three spatial dimensions. The tracking and vertexing software is fast and flexible, and easily adaptable to other functions, such as fast tracking for the trigger, or dedicated tracking for electrons that takes into account bremsstrahlung.

Search for jet extinction in the inclusive jet-p(T) spectrum from proton-proton collisions at root s=8 TeV

The first search at the LHC for the extinction of QCD jet production is presented, using data collected with the CMS detector corresponding to an integrated luminosity of 10.7 fb-1 of proton-proton collisions at a center-of-mass energy of 8 TeV. The extinction model studied in this analysis is motivated by the search for signatures of strong gravity at the TeV scale (terascale gravity) and assumes the existence of string couplings in the strong-coupling limit. In this limit, the string model predicts the suppression of all high-transverse-momentum standard model processes, including jet production, beyond a certain energy scale. To test this prediction, the measured transverse-momentum spectrum is compared to the theoretical prediction of the standard model. No significant deficit of events is found at high transverse momentum. A 95% confidence level lower limit of 3.3 TeV is set on the extinction mass scale.

Searches for electroweak neutralino and chargino production in channels with Higgs, Z, and W bosons in pp collisions at 8 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Observation of the diphoton decay of the Higgs boson and measurement of its properties

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Achados radiográficos e ultrassonográficos em equinos com doença do navicular

The distal sesamoid bone, also known as navicular bone, is located inside the hoof, palmar (thoracic limbs) or plantar (pelvic limbs) to distal interphalangeal joint. Its extremities are fixed by collateral medial and lateral sesamoidean ligament and distal impar sesamoidean ligament. Navicular disease diagnostic is made through a thorough clinical exam, nerve blocks and imaging exams. Even though imaging exams are not conclusive, they are essential to evaluate the extension of soft tissue lesions. Radiographic projections used to evaluate navicular bone are lateromedial (LM); dorsoproximal-palmaro/plantarodistal oblíqua (D30Pr-PaDiO); dorsoproximal-palmaro/plantarodistal oblíqua (D60Pr-PaDiO) e a palmaro/plantaroproximal-palmaro/plantarodistal oblíqua (PaPr-PaDiO). This exam allows to identify number and shape alterations of synovial invaginations on the distal (foramem nutricio) in the distal margin of distal sesamoid, osteophytes, enthesophytes and periarticular lesions. There are four ultrasonographic accesses described in literature to evaluate podotroclear apparatus, they are: palmar or plantar distal do the pastern, through the heel bulbs, through coronary band and transcuneal. These images allow a beeter the evaluation of soft tissue next to the distal sesamoid, because it is more sensitive than radiographic exam to evaluate acute lesions in soft tissues and perioesteum

Doença periodontal em cães

Periodontal disease affects the periodontum which are tissues that support and protect the tooth and are composed by the gingiva, alveolar bone, cementum and periodontal ligament. Lesions in the periodontum have as main etiologic agent the presence of plaque or biofilm, which is formed in 24 hours and, basically, it consists of microorganisms surrounded by some bacteria rich matrix products and salivary glycoproteins. Gingivitis is the first clinical manifestation of periodontal disease and it is reversible if the etiologic agent (plaque) is removed. However, if it is not treated or controlled, it will lead to an irreversible periodontitis, and even evolve into alveolar bone, tissue destruction and, eventually, tooth loss

Ontogenia condrocraniana de Rhinella schneideri

Os estudos sobre ontogenia e heterocronia geram dados importantes para análises filogenéticas, taxonômicas, ecológicas e evolutivas das espécies. Neste trabalho foi realizada a descrição da ontogenia condrocraniana de Rhinella schneideri, que pertence à grande e cosmopolita família Bufonidae (GAUDIN, 1978). Foram utilizados girinos já coletados e tombados na Coleção CFBH (Departamento de Zoologia, Instituto de Biociências, UNESP, Rio Claro, SP) em diferentes estágios de desenvolvimento, classificados pela tabela Gosner (1960). Esses indivíduos foram diafanizados seguindo a técnica de Taylor & Van Dyke (1985) modificada, analisados sob o uso de estereomicroscópios e quando necessário foram desarticulados, fotografados e desenhados. A descrição do condrocrânio do girino de R. schneideri foi feita em estágio 29 de desenvolvimento e foram realizadas comparações morfológicas deste semaforonte escolhido com os demais membros do gênero e da família, além de comparações mais generalizadas dentro de Anura. Foi descrita em detalhes a ontogenia das cartilagens e ossos cranianos indicando o estágio de aparecimento do osso, localização e formato dos centros de ossificação, além da direção de crescimento destes centros. Além disto, foram analisadas heterocronias da espécie R. schneideri através de comparações de desenvolvimento ontogenético entre indivíduos de outras espécies do gênero e família. Com estas descrições e análises além de se ampliar o conhecimento sobre a espécie R. schneideri, os dados e hipóteses gerados a partir deste estudo influenciarão determinantemente no status taxonômico e filogenético da espécie

Análise da viabilidade de simulações com feixes de prótons de 150MeV em alvos heterogêneos

A protonterapia é um tipo de tratamento promissor quanto a diminuição de dose nos tecidos adjacentes ao tumor, devido às suas característica de deposição de energia ao interagir com a matéria. Para aumentar a acurácia do tratamento é necessário que as simulações sejam feitas a partir de um sistema de formação de imagem que utilize também um feixe de prótons, como a tomografia por feixe de prótons (pCT). Essa área atualmente está em desenvolvimento e se defronta com inúmeros problemas na formação de uma imagem precisa. Este trabalho tem o intuito de analisar a viabilidade de simulações computacionais para este tipo de feixe. O código computacional SRIM é um conjunto de programas que calcula o freamento e o alcance de íons ao interagir com a matéria. Esse cálculo baseia-se em ferramentas oriundas da mecânica quântica e também no método de Monte Carlo, para determinar, de modo probabilístico, trajetórias, colisões e ângulos. Foram realizadas simulações no programa SRIM para um alvo heterogêneo envolvendo água e osso cortical. Para analisar o comportamento do feixe transmitido, foram feitas alterações na posição e no tamanho da heterogeneidade. A partir dos dados obtidos pode-se obter valores médios, histogramas e gaussianas dos mesmos para cada simulação e tirar conclusões sobre a viabilidade e as dependências desse tipo de simulação

Fístula infraorbitária associada à doença periodontal em cães

Veterinary Dentistry has grown considerably in recent years. This growth, associated to increase of knowledge among pet owners regarding responsible ownership of their pets, resulted in growing concern about the oral health of the animals that already can be observed at veterinary clinics. Among the oral diseases in dogs, infraorbital fistula, so called carnassial” fistula, is a periapical osteolytic lesion of the fourth premolar (4 SPM), often associated with periodontal disease. In its early stages, is characterized clinically by a swelling in the region of the jawbone before the formation of the fistula and leakage of a liquid serosanguineous or purulent secretion. Because of these clinical features, it is often misdiagnosed as a skin condition unrelated to the teeth. It is very important to obtain intraoral radiographs to confirm the diagnosis for performing the most appropriate treatment, according to the cause of the injury