59 research outputs found
El modelo sistémico de aprendizaje y enseñanza, como apoyo en la inserción laboral
The main objective of the research was to find out how the systemic process influences with the teaching and learning approach, in the labor inclusion of graduates of the Faculty of Law of the National University Hermilio Valdizán. To achieve this, the study was developed based on a descriptive explanatory type, under a non-experimental, correlational and cross-sectional design, for which we worked with a population of 121 graduates and the sample consisted of 37 graduates from the years 2016 and 2017, being of the non-probabilistic type, which were constructed two questionnaires, a questionnaire to measure the systematic teaching-learning process variable, another questionnaire to measure the job placement opportunity variable, all to qualify the level of influence. Sperman's Ro test was applied to evaluate the hypothesis. As a result, our results confirmed the study hypothesis, showing that the systemic teaching-learning process shows a significant relationship with job placement and that there is a positive influence between both variables. Reaching the conclusion that exercising a systemic process in teaching and learning generates opportunity in labor inclusion.La investigación tuvo como objetivo principal buscar cómo influye el proceso sistémico con el enfoque de enseñanza y aprendizaje, en la inclusión laboral de los egresados de la Facultad de Derecho de la Universidad Nacional Hermilio Valdizán. Para lograrlo, se desarrolló el estudio en base a tipo descriptivo explicativo, bajo un diseño no experimental, correlacional y de tipo transversal, para lo cual se trabajó con una población de 121 egresados y la muestra estuvo constituida por 37 egresados de los años 2016 y 2017, siendo del tipo no probabilístico, los cuales se construyeron dos cuestionarios, un cuestionario para medir la variable proceso sistemático de enseñanza-aprendizaje, otro cuestionario para medir la variable oportunidad de inserción laboral, todo ello para calificar el nivel de influencia. Para evaluar la hipótesis se aplicó la prueba Ro de Sperman. A raíz de ello nuestros resultados confirmaron la hipótesis de estudio, demostrando que el proceso sistémico de enseñanza-aprendizaje muestra una relación significativa con la inserción laboral y que existe influencia positiva entre ambas variables. Llegando a la conclusión que ejercer un proceso sistémico en la enseñanza y aprendizaje genera oportunidad en la inclusión laboral
Observation of resonances consistent with pentaquark states in decays
Observations of exotic structures in the channel, that we refer to
as pentaquark-charmonium states, in decays are
presented. The data sample corresponds to an integrated luminosity of 3/fb
acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude
analysis is performed on the three-body final-state that reproduces the
two-body mass and angular distributions. To obtain a satisfactory fit of the
structures seen in the mass spectrum, it is necessary to include two
Breit-Wigner amplitudes that each describe a resonant state. The significance
of each of these resonances is more than 9 standard deviations. One has a mass
of MeV and a width of MeV, while the second
is narrower, with a mass of MeV and a width of MeV. The preferred assignments are of opposite parity, with one
state having spin 3/2 and the other 5/2.Comment: 48 pages, 18 figures including the supplementary material, v2 after
referee's comments, now 19 figure
Quantum numbers of the state and orbital angular momentum in its decay
Angular correlations in decays, with , and , are used to measure
orbital angular momentum contributions and to determine the value of
the meson. The data correspond to an integrated luminosity of 3.0
fb of proton-proton collisions collected with the LHCb detector. This
determination, for the first time performed without assuming a value for the
orbital angular momentum, confirms the quantum numbers to be .
The is found to decay predominantly through S wave and an upper limit
of at C.L. is set on the fraction of D wave.Comment: 16 pages, 4 figure
Precise measurements of the properties of the B-1(5721)(0,+) and B-2*(5747)(0,+) states and observation of B-+,B-0 pi(-,+) mass structures
Invariant mass distributions of B+π− and B0π+ combinations are investigated in order to study excited B mesons. The analysis is based on a data sample corresponding to 3.0 fb−1 of pp collision data, recorded by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. Precise measurements of the masses and widths of the B1(5721)0,+ and B2(5747)0,+ states are reported. Clear enhancements, particularly prominent at high pion transverse momentum, are seen over background in the mass range 5850-6000 MeV in both B+π− and B0π+ combinations. The structures are consistent with the presence of four excited B mesons, labelled BJ (5840)0,+ and BJ (5960)0,+, whose masses and widths are obtained under different hypotheses for their quantum numbers
Measurement of the Ξ<sup>-</sup><sub>b</sub> and Ω<sup>-</sup><sub>b</sub> baryon lifetimes
Using a data sample of pp collisions corresponding to an integrated luminosity of , the and baryons are reconstructed in the and decay modes and their lifetimes measured to be \tau (\Xi_b^-) = 1.55\, ^{+0.10}_{-0.09}~{\rm(stat)} \pm 0.03\,{\rm(syst)} ps, \tau (\Omega_b^-) = 1.54\, ^{+0.26}_{-0.21}~{\rm(stat)} \pm 0.05\,{\rm(syst)} ps. These are the most precise determinations to date. Both measurements are in good agreement with previous experimental results and with theoretical predictions
First observation and amplitude analysis of the B−→D+K−π− decay
The B−→D+K−π− decay is observed in a data sample corresponding to 3.0 fb−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be B(B−→D+K−π−)=(7.31±0.19±0.22±0.39)×10−5 where the uncertainties are statistical, systematic and from the branching fraction of the normalization channel B−→D+π−π−, respectively. An amplitude analysis of the resonant structure of the B−→D+K−π− decay is used to measure the contributions from quasi-two-body B−→D∗0(2400)0K−, B−→D∗2(2460)0K−, and B−→D∗J(2760)0K− decays, as well as from nonresonant sources. The D∗J(2760)0 resonance is determined to have spin 1
First observation and amplitude analysis of the B- -> D+K-pi(-) decay
The B-→D+K-π- decay is observed in a data sample corresponding to 3.0 fb-1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be B(B-→D+K-π-)=(7.31±0.19±0.22±0.39)×10-5 where the uncertainties are statistical, systematic and from the branching fraction of the normalization channel B-→D+π-π-, respectively. An amplitude analysis of the resonant structure of the B-→D+K-π- decay is used to measure the contributions from quasi-two-body B-→D0∗(2400)0K-, B-→D2∗(2460)0K-, and B-→DJ∗(2760)0K- decays, as well as from nonresonant sources. The DJ∗(2760)0 resonance is determined to have spin 1
Dalitz plot analysis ofB0→D¯0π+π−decays
The resonant substructures of decays are
studied with the Dalitz plot technique. In this study a data sample
corresponding to an integrated luminosity of 3.0 fb of collisions
collected by the LHCb detector is used. The branching fraction of the decay in the region
GeV is measured to be ,
where the first uncertainty is statistical, the second is systematic and the
last arises from the normalisation channel . The
S-wave components are modelled with the Isobar and K-matrix
formalisms. Results of the Dalitz plot analyses using both models are
presented. A resonant structure at
GeV is confirmed and its spin-parity is determined for the first time
as . The branching fraction, mass and width of this structure are
determined together with those of the and
resonances. The branching fractions of other decay
components with are also reported. Many of these branching
fraction measurements are the most precise to date. The first observation of
the decays , , ,
and the first evidence of are presented.Comment: 64 pages, 17 figure
First observation and measurement of the branching fraction for the decay B0s→D∗∓sK±
17 pages, 4 figures - Subm. to JHEP - See paper for full list of authorsInternational audienceThe first observation of the B0s→D∗∓sK± decay is reported using 3.0fb−1 of proton-proton collision data collected by the LHCb experiment. The D∗∓s mesons are reconstructed through the decay chain D∗∓s→γD∓s(K∓K±π∓). The branching fraction relative to that for B0s→D∗−sπ+ is measured to be 0.068±0.005+0.003−0.002, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of BR(B0s→D∗−sπ+) the absolute branching fraction of B0s→D∗∓sK± is measured as ( 16.3 ± 1.2 (stat) +0.7−0.5 (syst) ± 4.8 (norm) ) × 10−5, where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel
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