Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Seguridad y salud en el trabajo en la unidad Materno Infantil de la empresa social del estado San Diego de Cereté, 2019

In the E.S.E. The San Diego Hospital of the municipality of Cereté - Córdoba carried out the present work which aims to: Prepare an improvement plan in Safety and Health at Work (SST) for the Maternal and Child functional unit of the ESE San Diego de Cereté, through the realization of a DOFA matrix and its respective analysis, in order to comply with Law 1562 of 2012. Materials and methods. a DOFA matrix was used; evidencing the need to intervene in the Maternal and Child functional unit. Results. Opportunities for improvement were found in the OSH actions, for which an improvement plan is prepared that included the realization of a Virtual Learning Object on the report of incidents and accidents at work. Conclusion. The SST is contemplated in the national regulations being mandatory for employers and workers, which seeks to keep the working population free of dangers; This policy is everyone's responsibility in the health institution and requires continuous improvement to promote the health of workers and thus contribute to qualityINTRODUCCIÓN ............................................................................................................................................... 111. OBJETIVOS ..................................................................................................................................................... 121.2. OBJETIVO GENERAL ......................................................................................................... 121.3 OBJETIVOS ESPECÍFICOS………………………………………………………………….2. PRESENTACIÓN INSTITUCIONAL ..................................................................................................... 132.1 RESEÑA HISTÓRICA ........................................................................................................... 132.2 ASPECTOS CORPORATIVOS ............................................................................................. 142.2.1 Misión .................................................................................................................................. 142.2.2 Visión ................................................................................................................................... 152.2.3 Objetivos .............................................................................................................................. 152.2.4 Valores ................................................................................................................................. 152.2.5 Principios fundamentales ..................................................................................................... 163. DIAGNÓSTICO DE LA UNIDAD FUNCIONAL .............................................................................. 173.1 MATRIZ DOFA DE LA UNIDAD FUNCIONAL MATERNO INFANTIL DE LA E.S.E HOSPTIAL SAN DIEGO DE CERETÉ CÓRDOBA .................................................................. 173.2 ORGANIGRAMA E.S.E HOSPITAL SAN DIEGO DE CERETÉ ....................................... 184. MARCO REFERENCIAL ........................................................................................................................... 194.1 MARCO TEÓRICO................................................................................................................ 194.2 MARCO CONCEPTUAL ...................................................................................................... 204.3 MARCO LEGAL .................................................................................................................... 225. METODOLOGÍA ........................................................................................................................................... 256. RESULTADOS ............................................................................................................................................... 267. CONCLUSIONES .......................................................................................................................................... 288. RECOMENDACIONES ............................................................................................................................... 29REFERENCIAS BIBLIOGRÁFICAS .......................................................................................................... 29ANEXOS ................................................................................................................................................................ 31Práctica empresarialEn la E.S.E. Hospital San Diego del municipio de Cereté – Córdoba se realizó el presente trabajo que tiene como objetivo: Elaborar un plan de mejora en Seguridad y Salud en el Trabajo (SST) para la unidad funcional Materno Infantil de la E.S.E San Diego de Cereté, mediante la realización de una matriz DOFA y su respectivo análisis, con el fin de dar cumplimiento a la Ley 1562 de 2012. Materiales y métodos. se empleó una matriz DOFA; evidenciándose la necesidad de intervenir en la unidad funcional Materno Infantil. Resultados. Se encontraron oportunidades de mejora en las acciones de SST para lo cual se elabora un plan de mejora que incluyo la realización de un Objeto Virtual de Aprendizaje sobre el reporte de los incidentes y accidentes laborales. Conclusión. La SST está contemplada en la normatividad nacional siendo de obligatorio cumplimiento para empleadores y trabajadores, la cual busca mantener a la población trabajadora libre peligros; esta política es responsabilidad de todos en la institución de salud y requiere de la mejora continua para promover la salud de los trabajadores y así contribuir a la calidad.PregradoAdministrador(a) en Salu

Search for direct top squark pair production in final states with two leptons in s=13\sqrt{s} = 13 TeV pppp collisions with the ATLAS detector

International audienceThe results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using $36.1~\hbox {fb}^{-1}$ of integrated luminosity from proton–proton collisions at $\sqrt{s}=13$ TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark $\tilde{t}$ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay $\tilde{t} \rightarrow b \tilde{\chi }_{1}^{\pm }$ into a b-quark and the lightest chargino with $\tilde{\chi }_{1}^{\pm } \rightarrow W \tilde{\chi }_{1}^{0}$ , the decay $\tilde{t} \rightarrow t \tilde{\chi }_{1}^{0}$ into an on-shell top quark and the lightest neutralino, the three-body decay $\tilde{t} \rightarrow b W \tilde{\chi }_{1}^{0}$ and the four-body decay $\tilde{t} \rightarrow b \ell \nu \tilde{\chi }_{1}^{0}$ . No significant excess of events is observed above the Standard Model background for any selection, and limits on top squarks are set as a function of the $\tilde{t}$ and $\tilde{\chi }_{1}^{0}$ masses. The results exclude at 95% confidence level $\tilde{t}$ masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches

Measurements of ttˉt\bar{t} differential cross-sections of highly boosted top quarks decaying to all-hadronic final states in pppp collisions at s=13 \sqrt{s}=13\, TeV using the ATLAS detector

Measurements are made of differential cross-sections of highly boosted pair-produced top quarks as a function of top-quark and $t\bar{t}$ system kinematic observables using proton--proton collisions at a center-of-mass energy of $\sqrt{s} = 13$ TeV. The data set corresponds to an integrated luminosity of $36.1$ fb$^{-1}$, recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Events with two large-radius jets in the final state, one with transverse momentum $p_{\rm T} > 500$ GeV and a second with $p_{\rm T}>350$ GeV, are used for the measurement. The top-quark candidates are separated from the multijet background using jet substructure information and association with a $b$-tagged jet. The measured spectra are corrected for detector effects to a particle-level fiducial phase space and a parton-level limited phase space, and are compared to several Monte Carlo simulations by means of calculated $\chi^2$ values. The cross-section for $t\bar{t}$ production in the fiducial phase-space region is $292 \pm 7 \ \rm{(stat)} \pm 76 \rm{(syst)}$ fb, to be compared to the theoretical prediction of $384 \pm 36$ fb

Study of the material of the ATLAS inner detector for Run 2 of the LHC

International audienceThe ATLAS inner detector comprises three different sub-detectors: the pixel detector, the silicon strip tracker, and the transition-radiation drift-tube tracker. The Insertable B-Layer, a new innermost pixel layer, was installed during the shutdown period in 2014, together with modifications to the layout of the cables and support structures of the existing pixel detector. The material in the inner detector is studied with several methods, using a low-luminosity √s=13 TeV pp collision sample corresponding to around 2.0 nb−1 collected in 2015 with the ATLAS experiment at the LHC. In this paper, the material within the innermost barrel region is studied using reconstructed hadronic interaction and photon conversion vertices. For the forward rapidity region, the material is probed by a measurement of the efficiency with which single tracks reconstructed from pixel detector hits alone can be extended with hits on the track in the strip layers. The results of these studies have been taken into account in an improved description of the material in the ATLAS inner detector simulation, resulting in a reduction in the uncertainties associated with the charged-particle reconstruction efficiency determined from simulation