ESTUDIO CLÍNICO-EPIDEMIOLÓGICO DE 301 PERSONAS ATENDIDAS EN LA REPÚBLICA DE HAITÍ

Se realizó un estudio clínico-epidemiológico observacional descriptivo de 301 personas atendidas en la República de Haití, en el período comprendido del 20 marzo del 2012 al 20 mayo del 2012 en el Servicio de Medicina y Terapia del Hospital Departemental du Centre Sainte Thérése de Hinche. La naturaleza social del conocimiento es destacada en el sentido de insistir en su función social, así como en el compromiso y la responsabilidad de la ciencia y los científicos. Se realizó un estudio clínico-epidemiológico observacional descriptivo, se le aplicó una encuesta  para el control y la tipificación de las patologías, validadas en anteriores estudios realizados. El objetivo de la investigación es conocer los rasgos clínico-epidemiológicos de la población haitiana que se asociaron a sus hábitos de vida y factores de riesgo personales. En el estudio realizado se confirma la estrecha relación clínico-epidemiológica de los trastornos que existen en la República de Haití. La literatura afirma que la mala disposición final de las excretas, unido a la exposición a vectores, consumo de bebidas que contienen alcohol, sedentarismo, contribuye  a la aparición de patologías que aumentan la mortalidad. Al conocer los rasgos clínico-epidemiológicos de la población haitiana asociados a sus hábitos de vida y factores de riesgo personales, se pueden prevenir muchos problemas de salud

CARACTERIZACIÓN DE LA LEPTOSPIROSIS EN 271 PERSONAS ATENDIDAS EN EN EL HOSPITAL UNIVERSITARIO “DR. ANTONIO LUACES IRAOLA”

Lo que da origen a esta investigación, es la prevención responsable del riesgo de contraer leptospirosis, qué se desconoce cómo evitarla. En el mundo la leptospirosis es una antrozoonosis que afecta a más de 160 especies de animales salvajes y domésticos que constituyen el reservorio y la fuente de infección para el hombre. Las especies más afectas son los roedores salvajes y los animales domésticos, especialmente los perros, el ganado bovino, porcino, ovino y equino. Se organizó un formulario para la recogida de datos individuales que incluyó las diferentes variables de estudio, se emplearon las evidencias significativas y el análisis de datos, se consultaran expertos en encuentros científicos, con profesionales de experiencia en el tema, en las etapas de elaboración y/o validación al respecto, además los datos obtenidos se compararon con la literatura nacional y extranjera actualizada. El objetivo fundamental  es caracterizar el comportamiento clínico-epidemiológico de leptospirosis en 271 personas atendidas en en el Hospital Universitario Dr. Antonio Luaces Iraolaen el período comprendido de octubre de 2008 a junio de 2011. No existió letalidad por leptospirosis, en los casos ingresados en el Servicio de Medicina del Hospital Universitario Dr. Antonio Luaces Iraola en el período estudiado, lo que demuestra una conducta correcta seguida en los mismos, que comparado con estudios de otros autores varía, entre el 2,2 y el 9,7%, no así cuando el trastorno ocurre en el embarazo, que letalidad la fetal es alta. El comportamiento clínico-epidemiológico de leptospirosis, coincide con la edad en que se realizan mayores labores agrícolas, que están íntimamente relacionadas con los factores predictivos o síntomas premonitorios

Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV

The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 inverse picobarns of data collected in pp collisions at sqrt(s) = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria covering a wide range of physics analysis needs have been examined. For all considered selections, the efficiency to reconstruct and identify a muon with a transverse momentum pT larger than a few GeV is above 95% over the whole region of pseudorapidity covered by the CMS muon system, abs(eta) < 2.4, while the probability to misidentify a hadron as a muon is well below 1%. The efficiency to trigger on single muons with pT above a few GeV is higher than 90% over the full eta range, and typically substantially better. The overall momentum scale is measured to a precision of 0.2% with muons from Z decays. The transverse momentum resolution varies from 1% to 6% depending on pseudorapidity for muons with pT below 100 GeV and, using cosmic rays, it is shown to be better than 10% in the central region up to pT = 1 TeV. Observed distributions of all quantities are well reproduced by the Monte Carlo simulation.Comment: Replaced with published version. Added journal reference and DO

Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV

The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 inverse picobarns of data collected in pp collisions at sqrt(s) = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria covering a wide range of physics analysis needs have been examined. For all considered selections, the efficiency to reconstruct and identify a muon with a transverse momentum pT larger than a few GeV is above 95% over the whole region of pseudorapidity covered by the CMS muon system, abs(eta) < 2.4, while the probability to misidentify a hadron as a muon is well below 1%. The efficiency to trigger on single muons with pT above a few GeV is higher than 90% over the full eta range, and typically substantially better. The overall momentum scale is measured to a precision of 0.2% with muons from Z decays. The transverse momentum resolution varies from 1% to 6% depending on pseudorapidity for muons with pT below 100 GeV and, using cosmic rays, it is shown to be better than 10% in the central region up to pT = 1 TeV. Observed distributions of all quantities are well reproduced by the Monte Carlo simulation.Comment: Replaced with published version. Added journal reference and DO

Azimuthal anisotropy of charged particles at high transverse momenta in PbPb collisions at sqrt(s[NN]) = 2.76 TeV

The azimuthal anisotropy of charged particles in PbPb collisions at nucleon-nucleon center-of-mass energy of 2.76 TeV is measured with the CMS detector at the LHC over an extended transverse momentum (pt) range up to approximately 60 GeV. The data cover both the low-pt region associated with hydrodynamic flow phenomena and the high-pt region where the anisotropies may reflect the path-length dependence of parton energy loss in the created medium. The anisotropy parameter (v2) of the particles is extracted by correlating charged tracks with respect to the event-plane reconstructed by using the energy deposited in forward-angle calorimeters. For the six bins of collision centrality studied, spanning the range of 0-60% most-central events, the observed v2 values are found to first increase with pt, reaching a maximum around pt = 3 GeV, and then to gradually decrease to almost zero, with the decline persisting up to at least pt = 40 GeV over the full centrality range measured.Comment: Replaced with published version. Added journal reference and DO

Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy

A search for new physics is performed in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state. The analysis is based on a data sample corresponding to an integrated luminosity of 4.98 inverse femtobarns produced in pp collisions at a center-of-mass energy of 7 TeV collected by the CMS experiment at the LHC. This constitutes a factor of 140 increase in integrated luminosity over previously published results. The observed yields agree with the standard model predictions and thus no evidence for new physics is found. The observations are used to set upper limits on possible new physics contributions and to constrain supersymmetric models. To facilitate the interpretation of the data in a broader range of new physics scenarios, information on the event selection, detector response, and efficiencies is provided.Comment: Published in Physical Review Letter

Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV

Results are presented from a search for a W' boson using a dataset corresponding to 5.0 inverse femtobarns of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV. The W' boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both left-handed and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W' to t b, leading to a final state signature with a single lepton (e, mu), missing transverse energy, and jets, at least one of which is tagged as a b-jet. A W' boson that couples to fermions with the same coupling constant as the W, but to the right-handed rather than left-handed chiral projections, is excluded for masses below 1.85 TeV at the 95% confidence level. For the first time using LHC data, constraints on the W' gauge coupling for a set of left- and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe

Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV

A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270-440 GeV range is excluded at 95% confidence level.Comment: Submitted to JHE

Combined search for the quarks of a sequential fourth generation

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions.Comment: Replaced with published version. Added journal reference and DO

Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV

The t t-bar production cross section (sigma[t t-bar]) is measured in proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS experiment, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The measurement is performed in events with two leptons (electrons or muons) in the final state, at least two jets identified as jets originating from b quarks, and the presence of an imbalance in transverse momentum. The measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/- 2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction of the standard model.Comment: Replaced with published version. Included journal reference and DO