119 research outputs found

    Propuesta de Gobierno Abierto: Portal del Inscrito para el Consejo Profesional Nacional de Ingeniería – COPNIA, Colombia

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    No aplicaEntendiendo el gobierno abierto como un modelo de interacción entre el Estado y la ciudadanía, se hace cada vez más necesario el desarrollo de estrategias que faciliten el diálogo entre estos actores, permitiendo así al ciudadano ejercer su derecho a la participación en la gestión de asuntos públicos. La relevancia que ha adquirido este modelo de gobierno con el avance tecnológico ha llevado a un desarrollo de políticas a nivel nacional tendientes a la modernización del Estado colombiano, así como a la definición de estrategias de transparencia, participación ciudadana y rendición de cuentas. Para que estas políticas puedan implementarse y lograr sus objetivos se debe incentivar el interés por lo público desde el mismo Estado. Es por esto, que el proyecto aplicado pretende construir una estrategia de gobierno abierto en el Consejo Profesional Nacional de Ingeniería – COPNIA, con el fin de incentivar una participación significativa de los inscritos en el registro profesional, garantizando así el ejercicio de la participación digital, la colaboración ciudadana y el control social. Para lo cual se aplicó la metodología de criterios ponderados, incluyendo un planteamiento de alternativas, así como la definición y evaluación de los criterios de selección, el análisis de actores y un plan de implementación. Como resultado de la aplicación de la metodología se propone implementar el Portal del Inscrito, un portal web exclusivo para los profesionales que se encuentran en el registro profesional del COPNIA, el cual sería administrado por módulos, con información de interés para este grupo de profesionales y con la posibilidad de ser escuchados a través de herramientas que capturen información acerca de sus opiniones y necesidades frente a la gestión institucional. Esta herramienta permitirá crear un vínculo entre el COPNIA y sus profesionales inscritos, propiciando la comunicación bidireccional, base para lograr una participación significativa por parte de este actor en las diferentes etapas de la gestión de la Entidad. Además, se definió el plan de implementación de la alternativa seleccionada, considerando cada una de las etapas de implementación, su responsable y el valor estimado para su ejecución.Understanding open government as a model of interaction between the State and citizens, it is increasingly necessary to develop strategies that facilitate dialogue between these actors, thus allowing citizens to exercise their right to participate in the management of public affairs. The relevance that this model of government has acquired with technological progress has led to the development of policies at the national level aimed at the modernization of the Colombian State, as well as the definition of strategies for transparency, citizen participation and accountability. For these policies to be implemented and achieve their objectives, interest in the public must be encouraged from the State itself. That is why the applied project aims to promote a strategy of open governance in the Consejo Profesional Nacional de Ingeniería – COPNIA, in order to encourage a significant participation of the registered in the professional registry, thus guaranteeing the exercise of digital citizen participation, collaboration citizen and social control. For which the methodology of weighted criteria was applied, including an approach of alternatives, as well as the definition and evaluation of the selection criteria, the analysis of actors and an implementation plan. As a result of this study, it is proposed to implement the Registrant Portal, an exclusive web portal for professionals who are in the COPNIA professional registry, which would be managed by modules, with information of interest to this group of professionals and with the possibility of being heard through tools that capture information about their opinions and needs. versus institutional management. The implementation plan of the selected alternative was defined, as well as an estimated execution value of this project

    Elliptic anisotropy measurement of the f0_0(980) hadron in proton-lead collisions and evidence for its quark-antiquark composition

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    International audienceDespite the f0_0(980) hadron having been discovered half a century ago, the question about its quark content has not been settled: it might be an ordinary quark-antiquark (qqˉ\mathrm{q\bar{q}}) meson, a tetraquark (qqˉqqˉ\mathrm{q\bar{q}q\bar{q}}) exotic state, a kaon-antikaon (KKˉ\mathrm{K\bar{K}}) molecule, or a quark-antiquark-gluon (qqˉg\mathrm{q\bar{q}g}) hybrid. This paper reports strong evidence that the f0_0(980) state is an ordinary qqˉ\mathrm{q\bar{q}} meson, inferred from the scaling of elliptic anisotropies (v2v_2) with the number of constituent quarks (nqn_\mathrm{q}), as empirically established using conventional hadrons in relativistic heavy ion collisions. The f0_0(980) state is reconstructed via its dominant decay channel f0_0(980) \toπ+π\pi^+\pi^-, in proton-lead collisions recorded by the CMS experiment at the LHC, and its v2v_2 is measured as a function of transverse momentum (pTp_\mathrm{T}). It is found that the nqn_q = 2 (qqˉ\mathrm{q\bar{q}} state) hypothesis is favored over nqn_q = 4 (qqˉqqˉ\mathrm{q\bar{q}q\bar{q}} or KKˉ\mathrm{K\bar{K}} states) by 7.7, 6.3, or 3.1 standard deviations in the pTp_\mathrm{T}<\lt 10, 8, or 6 GeV/cc ranges, respectively, and over nqn_\mathrm{q} = 3 (qqˉg\mathrm{q\bar{q}g} hybrid state) by 3.5 standard deviations in the pTp_\mathrm{T}<\lt 8 GeV/cc range. This result represents the first determination of the quark content of the f0_0(980) state, made possible by using a novel approach, and paves the way for similar studies of other exotic hadron candidates

    Extracting the speed of sound in the strongly interacting matter created in ultrarelativistic lead-lead collisions at the LHC

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    International audienceUltrarelativistic nuclear collisions create a strongly interacting state of hot and dense quark-gluon matter that exhibits a remarkable collective flow behavior with minimal viscous dissipation. To gain deeper insights into its intrinsic nature and fundamental degrees of freedom, we extracted the speed of sound in this medium created using lead-lead (PbPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data were recorded by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 0.607 nb1^{-1}. The measurement is performed by studying the multiplicity dependence of the average transverse momentum of charged particles emitted in head-on PbPb collisions. Our findings reveal that the speed of sound in this matter is nearly half the speed of light, with a squared value of 0.241 ±\pm 0.002 (stat) ±\pm 0.016 (syst) in natural units. The effective medium temperature, estimated using the mean transverse momentum, is 219 ±\pm 8 (syst) MeV. The measured squared speed of sound at this temperature aligns precisely with predictions from lattice quantum chromodynamic (QCD) calculations. This result provides a stringent constraint on the equation of state of the created medium and direct evidence for a deconfined QCD phase being attained in relativistic nuclear collisions

    Test of lepton flavor universality in B± ⁣ ⁣K±μ+μ {\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mu^{+}\mu^{-} and B± ⁣ ⁣K±e+e {\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mathrm{e}^+\mathrm{e}^- decays in proton-proton collisions at s= \sqrt{s} = 13 TeV

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    A test of lepton flavor universality in B± ⁣ ⁣K±μ+μ {\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mu^{+}\mu^{-} and B± ⁣ ⁣K±e+e {\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mathrm{e}^+\mathrm{e}^- decays, as well as a measurement of differential and integrated branching fractions of a nonresonant B± ⁣ ⁣K±μ+μ {\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mu^{+}\mu^{-} decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions at s= \sqrt{s} = 13 TeV recorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractions B(B± ⁣ ⁣K±μ+μ) \mathcal{B}({\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mu^{+}\mu^{-}) to B(B± ⁣ ⁣K±e+e) \mathcal{B}({\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mathrm{e}^+\mathrm{e}^-) is determined from the measured double ratio R(K) R(\mathrm{K}) of these decays to the respective branching fractions of the B± ⁣ ⁣J/ψK± {\mathrm{B}^{\pm}} \!\to\! {\mathrm{J}/\psi} \mathrm{K^{\pm}} with J/ψ ⁣ ⁣μ+μ {\mathrm{J}/\psi} \!\to\!\mu^{+}\mu^{-} and e+e \mathrm{e}^+\mathrm{e}^- decays, which allow for significant cancellation of systematic uncertainties. The ratio R(K) R(\mathrm{K}) is measured in the range 1.1 <q2< < q^2 < 6.0 GeV2^2 , where q q is the invariant mass of the lepton pair, and is found to be R(K)= R(\mathrm{K})= 0.78 0.23+0.47 ^{+0.47}_{-0.23} , in agreement with the standard model expectation R(K) R(\mathrm{K}) \approx 1. This measurement is limited by the statistical precision of the electron channel. The integrated branching fraction in the same q2 q^2 range, B(B± ⁣ ⁣K±μ+μ)= \mathcal{B}({\mathrm{B}^{\pm}} \!\to\! \mathrm{K^{\pm}}\mu^{+}\mu^{-}) = (12.42 ± \pm 0.68) ×\times 108^{-8} , is consistent with the present world-average value and has a comparable precision.A test of lepton flavor universality in B±^{\pm}\to K±μ+μ^{\pm}\mu^+\mu^- and B±^{\pm}\to K±^{\pm}e+^+e^- decays, as well as a measurement of differential and integrated branching fractions of a nonresonant B±^{\pm}\to K±μ+μ^{\pm}\mu^+\mu^- decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions at s\sqrt{s} = 13 TeV recorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractions B\mathcal{B}(B±^{\pm}\to K±μ+μ^{\pm}\mu^+\mu^-) to B\mathcal{B}(B±^{\pm}\to K±^{\pm}e+^+e^-) is determined from the measured double ratio RR(K) of these decays to the respective branching fractions of the B±^\pm\to J/ψ\psiK±^\pm with J/ψ\psi\toμ+μ\mu^+\mu^- and e+^+e^- decays, which allow for significant cancellation of systematic uncertainties. The ratio RR(K) is measured in the range 1.1 <q2<\lt q^2 \lt 6.0 GeV2^2, where qq is the invariant mass of the lepton pair, and is found to be RR(K) = 0.780.23+0.47^{+0.47}_{-0.23}, in agreement with the standard model expectation RR(K) \approx 1. This measurement is limited by the statistical precision of the electron channel. The integrated branching fraction in the same q2q^2 range, B\mathcal{B}(B±^{\pm}\to K±μ+μ^{\pm}\mu^+\mu^-) = (12.42 ±\pm 0.68) ×\times 108^{-8}, is consistent with the present world-average value and has a comparable precision

    Observation of the Ξb\Xi^-_\mathrm{b}\toψ\psi(2S)Ξ\Xi^- decay and studies of the Ξb0\Xi_\mathrm{b}^{\ast{}0} baryon in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceThe first observation of the decay Ξb\Xi^-_\mathrm{b}\toψ\psi(2S)Ξ\Xi^- and measurement of the branching ratio of Ξb\Xi^-_\mathrm{b}\toψ\psi(2S)Ξ\Xi^- to Ξb\Xi^-_\mathrm{b}\to J/ψ\psiΞ\Xi^- are presented. The J/ψ\psi and ψ\psi(2S) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at s\sqrt{s} = 13 TeV in 2016-2018, corresponding to an integrated luminosity of 140 fb1^{-1}. The branching fraction ratio is measured to be B\mathcal{B}(Ξb\Xi^-_\mathrm{b}\toψ\psi(2S)Ξ\Xi^-)/B\mathcal{B}(Ξb\Xi^-_\mathrm{b}\to J/ψ\psiΞ\Xi^-) = 0.840.19+0.21^{+0.21}_{-0.19} (stat) ±\pm 0.10 (syst) ±\pm 0.02 (B\mathcal{B}), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the Ξb0\Xi_\mathrm{b}^{\ast{}0} baryon mass and natural width are also presented, using the Ξbπ+\Xi_\mathrm{b}^-\pi^+ final state, where the Ξb\Xi^-_\mathrm{b} baryon is reconstructed through the decays J/ψΞ\psi \Xi^-, ψ\psi(2S)Ξ\Xi^-, J/ψΛ\psi \LambdaK^-, and J/ψΣ0\psi \Sigma^0K^-. Finally, the fraction of the Ξb\Xi^-_\mathrm{b} baryons produced from Ξb0\Xi_\mathrm{b}^{\ast{}0} decays is determined

    Search for the decay of the Higgs boson to a pair of light pseudoscalar bosons in the final state with four bottom quarks in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceA search is presented for the decay of the 125 GeV Higgs boson (H) to a pair of new light pseudoscalar bosons (a), followed by the prompt decay of each a boson to a bottom quark-antiquark pair, H \to aa \tobbˉbbˉ\mathrm{b\bar{b}b\bar{b}}. The analysis is performed using a data sample of proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb1^{-1}. To reduce the background from standard model processes, the search requires the Higgs boson to be produced in association with a leptonically decaying W or Z boson. The analysis probes the production of new light bosons in a 15 <\ltmam_\mathrm{a}<\lt 60 GeV mass range. Assuming the standard model predictions for the Higgs boson production cross sections for pp \to WH and ZH, model independent upper limits at 95% confidence level are derived for the branching fraction B\mathcal{B}(H \to aa \to bbˉbbˉ\mathrm{b\bar{b}b\bar{b}}). The combined WH and ZH observed upper limit on the branching fraction ranges from 1.10 for ma=m_\mathrm{a} = 20 GeV to 0.36 for ma=m_\mathrm{a} = 60 GeV, complementing other measurements in the μμττ\mu\mu\tau\tau, ττττ\tau\tau\tau\tau and bb\ell\ell (=\ell= μ\mu,τ\tau) channels

    Search for new resonances decaying to pairs of merged diphotons in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceA search is presented for an extended Higgs sector with two new particles, X and ϕ\phi, in the process X \toϕϕ\phi\phi\to(γγ)(γγ)(\gamma\gamma)(\gamma\gamma). Novel neural networks classify events with diphotons that are merged and determine the diphoton masses. The search uses LHC proton-proton collision data at s\sqrt{s} = 13 TeV collected with the CMS detector, corresponding to an integrated luminosity of 138 fb1^{-1}. No evidence of such resonances is seen. Upper limits are set on the production cross section versus the resonance masses, representing the most sensitive search in this channel

    Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton

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    International audienceA search for long-lived heavy neutral leptons (HNLs) is presented, which considers the hadronic final state and coupling scenarios involving all three lepton generations in the 2-20 GeV HNL mass range for the first time. Events comprising two leptons (electrons or muons) and jets are analyzed in a data sample of proton-proton collisions, recorded with the CMS experiment at the CERN LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb1^{-1}. A novel jet tagger, based on a deep neural network, has been developed to identify jets from an HNL decay using various features of the jet and its constituent particles. The network output can be used as a powerful discriminating tool to probe a broad range of HNL lifetimes and masses. Contributions from background processes are determined from data. No excess of events in data over the expected background is observed. Upper limits on the HNL production cross section are derived as functions of the HNL mass and the three coupling strengths VNV_{\ell\mathrm{N}} to each lepton generation \ell and presented as exclusion limits in the coupling-mass plane, as lower limits on the HNL lifetime, and on the HNL mass. In this search, the most stringent limit on the coupling strength is obtained for pure muon coupling scenarios; values of VμN2>\lvert V_{\mu\mathrm{N}}\rvert^{2}\gt 5 (4)×\times107^{-7} are excluded for Dirac (Majorana) HNLs with a mass of 10 GeV at a confidence level of 95% that correspond to proper decay lengths of 17 (10) mm

    Search for baryon number violation in top quark production and decay using proton-proton collisions at s= \sqrt{s} = 13 TeV

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    A search is presented for baryon number violating interactions in top quark production and decay. The analysis uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC with an integrated luminosity of 138 fb1 ^{-1} . Candidate events are selected by requiring two oppositely-charged leptons (electrons or muons) and exactly one jet identified as originating from a bottom quark. Multivariate discriminants are used to separate the signal from the background. No significant deviation from the standard model prediction is observed. Upper limits are placed on the strength of baryon number violating couplings. For the first time the production of single top quarks via baryon number violating interactions is studied. This allows the search to set the most stringent constraints to date on the branching fraction of the top quark decay to a lepton, an up-type quark (u or c), and a down-type quark (d, s, or b). The results improve the previous bounds by three to six orders of magnitude based on the fermion flavor combination of the baryon number violating interactions.A search is presented for baryon number violating interactions in top quark production and decay. The analysis uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC with an integrated luminosity of 138 fb1^{-1}. Candidate events are selected by requiring two oppositely-charged leptons (electrons or muons) and exactly one jet identified as originating from a bottom quark. Multivariate discriminants are used to separate the signal from the background. No significant deviation from the standard model prediction is observed. Upper limits are placed on the strength of baryon number violating couplings. For the first time the production of single top quarks via baryon number violating interactions is studied. This allows the search to set the most stringent constraints to date on the branching fraction of the top quark decay to a lepton, an up-type quark (u or c), and a down-type quark (d, s, or b). The results improve the previous bounds by three to six orders of magnitude based on the fermion flavor combination of the baryon number violating interactions
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