Évaluation, développement professionnel et organisation scolaire

Introduction La mondialisation confronte tous les pays à un certain nombre de défis semblables : une obligation de résultats, qui concerne aussi bien les élèves que les enseignants et les établissements scolaires ; une maîtrise des compétences de base nécessaires à l’investissement en capital humain et à la réussite de parcours professionnels tout au long de la vie. Plusieurs ont entrepris des changements importants dans leur politique d’éducation, notamment en définissant des stratégies nati..

Note methodologique sur l'évaluation micro-économique de cultures pérennes. Application d'un modèle de simulation au cas d'une plantation de goyavier-fraise

Cette note présente un outil de simulation des résultats micro-économiques de cultures pérennes, développé sur tableur. La démarche adoptée combine l'approche comptable du budget de culture et l'évaluation financière de projet d'investissement productif. Elle permet de dégager des indicateurs couvrant les divers registres de l'analyse microéconomique d'une production : la valorisation du travail et de la terre, les coûts de production, les viabilité et rentabilité financières à partir des flux de trésorerie. Ces résultats visent à éclairer les décisions sur l'opportunité d'une production et son dimensionnement. La simulation est illustrée par le cas d'une plantation de goyavier-fraise

Multidifferential study of identified charged hadron distributions in ZZ-tagged jets in proton-proton collisions at s=\sqrt{s}=13 TeV

Jet fragmentation functions are measured for the first time in proton-proton collisions for charged pions, kaons, and protons within jets recoiling against a $Z$ boson. The charged-hadron distributions are studied longitudinally and transversely to the jet direction for jets with transverse momentum 20 $< p_{\textrm{T}} < 100$ GeV and in the pseudorapidity range $2.5 < \eta < 4$. The data sample was collected with the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.64 fb$^{-1}$. Triple differential distributions as a function of the hadron longitudinal momentum fraction, hadron transverse momentum, and jet transverse momentum are also measured for the first time. This helps constrain transverse-momentum-dependent fragmentation functions. Differences in the shapes and magnitudes of the measured distributions for the different hadron species provide insights into the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb public pages

Study of the B−→Λc+Λˉc−K−B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} decay

The decay $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ is studied in proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13$ TeV using data corresponding to an integrated luminosity of 5 $\mathrm{fb}^{-1}$ collected by the LHCb experiment. In the $\Lambda_{c}^+ K^{-}$ system, the $\Xi_{c}(2930)^{0}$ state observed at the BaBar and Belle experiments is resolved into two narrower states, $\Xi_{c}(2923)^{0}$ and $\Xi_{c}(2939)^{0}$, whose masses and widths are measured to be $$m(\Xi_{c}(2923)^{0}) = 2924.5 \pm 0.4 \pm 1.1 \,\mathrm{MeV}, \\ m(\Xi_{c}(2939)^{0}) = 2938.5 \pm 0.9 \pm 2.3 \,\mathrm{MeV}, \\ \Gamma(\Xi_{c}(2923)^{0}) = \phantom{000}4.8 \pm 0.9 \pm 1.5 \,\mathrm{MeV},\\ \Gamma(\Xi_{c}(2939)^{0}) = \phantom{00}11.0 \pm 1.9 \pm 7.5 \,\mathrm{MeV},$$ where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt $\Lambda_{c}^{+} K^{-}$ sample. Evidence of a new $\Xi_{c}(2880)^{0}$ state is found with a local significance of $3.8\,\sigma$, whose mass and width are measured to be $2881.8 \pm 3.1 \pm 8.5\,\mathrm{MeV}$ and $12.4 \pm 5.3 \pm 5.8 \,\mathrm{MeV}$, respectively. In addition, evidence of a new decay mode $\Xi_{c}(2790)^{0} \to \Lambda_{c}^{+} K^{-}$ is found with a significance of $3.7\,\sigma$. The relative branching fraction of $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ with respect to the $B^{-} \to D^{+} D^{-} K^{-}$ decay is measured to be $2.36 \pm 0.11 \pm 0.22 \pm 0.25$, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb public pages

Measurement of the ratios of branching fractions R(D∗)\mathcal{R}(D^{*}) and R(D0)\mathcal{R}(D^{0})

The ratios of branching fractions $\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}\to D^{*}\mu^{-}\bar{\nu}_{\mu})$ and $\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(B^{-}\to D^{0}\mu^{-}\bar{\nu}_{\mu})$ are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb${ }^{-1}$ of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode $\tau^{-}\to\mu^{-}\nu_{\tau}\bar{\nu}_{\mu}$. The measured values are $\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024$ and $\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066$, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is $\rho=-0.43$. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb public pages

La question du leadership en éducation : perspectives européennes

Cet ouvrage rend compte des résultats d'un premier échange sur la question du leadership en éducation, organisé à Lyon en avril 2012. Sont notamment abordées les questions autour de l'autonomie des établissements scolaires et de l'organisation du travail en leur sein. Au-delà des différences de traditions politiques, des questions communes se posent : comment coordonner l'action des personnes qui se réfèrent à des valeurs différentes au service de la réussite de tous les élèves ? Quel accompagnement du développement professionnel des personnels d'encadrement, enseignants et personnels d'éducation, pour préparer cette nouvelle répartition des responsabilités

A European politics of education : perspectives from sociology, policy studies and politics

International audienceA European Politics of Education proposes a sociology of education establishing connections between empirical data coming from European-scale comparative surveys, normative assumptions structuring actors’ representations and interpretative judgements, and a specific focus on Lifelong Learning policy areas. It invites readers to think about the place of standards, expertise and calculations in the European space from a common perspective, supported by a tradition of critical sociology and European political studies. The book: Addresses an important agenda: how the policies and politics of supranational Europe are making a European educational space Contains a response to the emergence of new epistemic governance and instruments at European level Contains contributions from the EU and the UK which give a comprehensive selection of perspectives and analysis of the field as it concerns Europe The complexity of the contemporary European education policy space is addressed here with new lines of inquiry as well as a reflexive outlook, on standardization, policy-making and actor engagement. Students and researchers of European policy studies, education policy analysts and theorists will all be particularly interested readers

Top-down accountability and local management : tensions and contradictions experienced by French principals as leaders

International audienceTop-down accountability and local management : tensions and contradictions experienced by French principals as leader