325 research outputs found

    Metodología para capacitación de entrenadores en captación de talentos para fútbol en Esmeraldas, Ecuador

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    El trabajo es parte de un proyecto de investigación que se impulsa desde la Universidad Técnica Luis Vargas Torres intitulado “Procedimientos para el fortalecimiento y sostenimiento de los emprendimientos del cantón Esmeraldas”, consistió en elaborar una alternativa metodológica para capacitación de entrenadores de fútbol, que permita la captación eficiente de talentos para fútbol en la provincia Esmeraldas, tributo invisibilizado en el desarrollo socioeconómico local, el trabajo cualitativo parte de aplicación de técnicas como entrevista, test físicos e información bibliográfica de fuentes deportivas y Google académico aportando una sólida fundamentación teórica, conceptual y metodológica. La muestra la integraron 20 entrenadores de fútbol locales. Los resultados respondieron la expectativa de los investigadores, logrando elevar el nivel de conocimiento al 50.50% de involucrados en este estudio, las herramientas seleccionadas constituyen aspectos reveladores en el ámbito deportivo por lo que representa el fútbol en la población mundial.PALABRAS CLAVE: metodología; Educación física; competencia deportiva; deporte; club.Methodology for training coaches in soccer talent recruitment in Esmeraldas, Ecuador ABSTRACTThe work is part of a research project that is promoted from the Technical University Luis Vargas Torres entitled "Procedures for the strengthening and sustainability of enterprises in the canton of Esmeraldas", consisted of developing a methodological alternative for training soccer coaches, The qualitative work is based on the application of techniques such as interviews, physical tests and bibliographic information from sports sources and academic Google, providing a solid theoretical, conceptual and methodological foundation. The sample consisted of 20 local soccer coaches. The results met the researchers' expectations, raising the level of knowledge to 50.50% of those involved in this study, the selected tools constitute revealing aspects in the sports field because of what soccer represents in the world population.KEYWORDS: methodology; physical education; physical education; sport competition; sport; club.

    Search for stealth supersymmetry in final states with two photons, jets, and low missing transverse momentum in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceThe results of a search for stealth supersymmetry in final states with two photons and jets, targeting a phase space region with low missing transverse momentum (pTmissp_\text{T}^\text{miss}), are reported. The study is based on a sample of proton-proton collisions at s\sqrt{s} =13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb1^{-1}. As LHC results continue to constrain the parameter space of the minimal supersymmetric standard model, the low pTmissp_\text{T}^\text{miss} regime is increasingly valuable to explore. To estimate the backgrounds due to standard model processes in such events, we apply corrections derived from simulation to an estimate based on a control selection in data. The results are interpreted in the context of simplified stealth supersymmetry models with gluino and squark pair production. The observed data are consistent with the standard model predictions, and gluino (squark) masses of up to 2150 (1850) GeV are excluded at the 95% confidence level

    Search for narrow trijet resonances in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceThe first search for narrow resonances decaying to three well-separated hadronic jets is presented. The search uses proton-proton collision data corresponding to an integrated luminosity of 138 fb1^{-1} at s\sqrt{s} = 13 TeV, collected at the CERN LHC. No significant deviations from the background predictions are observed between 1.75-9.00 TeV. The results provide the first mass limits on a right-handed boson ZR_{\mathrm{R}} decaying to three gluons, an excited quark decaying via a vector boson to three quarks, as well as updated limits on a Kaluza-Klein gluon decaying via a radion to three gluons

    Observation of WWγ\gamma production and search for Hγ\gamma production in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceThe observation of WWγ\gamma production in proton-proton collisions at a center-of-mass energy of 13 TeV with an integrated luminosity of 138 fb1^{-1} is presented. The observed (expected) significance is 5.6 (4.7) standard deviations. Events are selected by requiring exactly two leptons (one electron and one muon) of opposite charge, moderate missing transverse momentum, and a photon. The measured fiducial cross section for WWγ\gamma is 6.0 ±\pm 0.8 (stat) ±\pm 0.7 (syst) ±\pm 0.6 (modeling) fb, in agreement with the next-to-leading order quantum chromodynamics prediction. The analysis is extended with a search for the associated production of the Higgs boson and a photon, which is generated by a coupling of the Higgs boson to light quarks. The result is used to constrain the Higgs boson couplings to light quarks

    Search for direct production of GeV-scale resonances decaying to a pair of muons in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceA search for direct production of low-mass dimuon resonances is performed using s\sqrt{s} = 13 TeV proton-proton collision data collected by the CMS experiment during the 2017-2018 operation of the CERN LHC with an integrated luminosity of 96.6 fb1^{-1}. The search exploits a dedicated high-rate trigger stream that records events with two muons with transverse momenta as low as 3 GeV but does not include the full event information. The search is performed by looking for narrow peaks in the dimuon mass spectrum in the ranges of 1.1-2.6 GeV and 4.2-7.9 GeV. No significant excess of events above the expectation from the standard model background is observed. Model-independent limits on production rates of dimuon resonances within the experimental fiducial acceptance are set. Competitive or world's best limits are set at 90% confidence level for a minimal dark photon model and for a scenario with two Higgs doublets and an extra complex scalar singlet (2HDM+S). Values of the squared kinetic mixing coefficient ε2\varepsilon^2 in the dark photon model above 106^{-6} are excluded over most of the mass range of the search. In the 2HDM+S, values of the mixing angle sin(θH)\sin(\theta_\text{H}) above 0.08 are excluded over most of the mass range of the search with a fixed ratio of the Higgs doublets vacuum expectation tanβ\tan\beta = 0.5

    Search for the lepton flavor violating τ\tau \to 3μ\mu decay in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceA search for the lepton flavor violating τ\tau \to 3μ\mu decay is performed using proton-proton collision events at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2017-2018, corresponding to an integrated luminosity of 97.7 fb1^{-1}. Tau leptons produced in both heavy-flavor hadron and W boson decays are exploited in the analysis. No evidence for the decay is observed. The results of this search are combined with an earlier null result based on data collected in 2016 to obtain a total integrated luminosity of 131 fb1^{-1}. The observed (expected) upper limits on the branching fraction B\mathcal{B}(τ\tau \to 3μ\mu) at confidence levels of 90 and 95% are 2.9×\times108^{-8} (2.4×\times108^{-8}) and 3.6×\times108^{-8} (3.0×\times108^{-8}), respectively

    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

    Search for CPCP violation in D0^0\to KS0^0_\mathrm{S}KS0^0_\mathrm{S} decays in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceA search is reported for charge-parity D0^0\to KS0^0_\mathrm{S}KS0^0_\mathrm{S}CPCP violation in D0^0\to KS0^0_\mathrm{S}KS0^0_\mathrm{S} decays, using data collected in proton-proton collisions at s\sqrt{s} = 13 TeV recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6 fb1^{-1}, which consists of about 10 billion events containing a pair of ẖadrons, nearly all of which decay to charm hadrons. The flavor of the neutral D meson is determined by the pion charge in the reconstructed decays D+^{*+}\to D0π+^0\pi^+ and D^{*-}\to D0π^0\pi^-. The D0^0\to KS0^0_\mathrm{S}KS0^0_\mathrm{S}CPCP asymmetry in D0^0\to KS0^0_\mathrm{S}KS0^0_\mathrm{S} is measured to be ACPA_{CP}( KS0^0_\mathrm{S}KS0^0_\mathrm{S}) = (6.2 ±\pm 3.0 ±\pm 0.2 ±\pm 0.8)%, where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the D0^0 \to KS0^0_\mathrm{S}KS0^0_\mathrm{S} CPCP asymmetry in the D0^0 \to KS0π+π^0_\mathrm{S}\pi^+\pi^- decay. This is the first D0^0 \to KS0^0_\mathrm{S}KS0^0_\mathrm{S} CPCP asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state

    Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at s\sqrt{s} = 13 TeV

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    International audienceA measurement is presented of a ratio observable that provides a measure of the azimuthal correlations among jets with large transverse momentum pTp_\mathrm{T}. This observable is measured in multijet events over the range of pTp_\mathrm{T} = 360-3170 GeV based on data collected by the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 134 fb1^{-1}. The results are compared with predictions from Monte Carlo parton-shower event generator simulations, as well as with fixed-order perturbative quantum chromodynamics (pQCD) predictions at next-to-leading-order (NLO) accuracy obtained with different parton distribution functions (PDFs) and corrected for nonperturbative and electroweak effects. Data and theory agree within uncertainties. From the comparison of the measured observable with the pQCD prediction obtained with the NNPDF3.1 NLO PDFs, the strong coupling at the Z boson mass scale is αS(mZ)\alpha_\mathrm{S}(m_\mathrm{Z}) = 0.1177 ±\pm 0.0013 (exp) 0.0073+0.0116_{-0.0073}^{+0.0116} (theo) = 0.11770.0074+0.0117_{-0.0074}^{+0.0117}, where the total uncertainty is dominated by the scale dependence of the fixed-order predictions. A test of the running of αS(mZ)\alpha_\mathrm{S}(m_\mathrm{Z}) in the TeV region shows no deviation from the expected NLO pQCD behaviour
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