405 research outputs found
Introduction: Finding common ground beyond fragmentation
This chapter begins with an outline of the European context within which the twenty six research papers presented in this book emerged. A particularly important aspect of this context is Network 27 on Didactics, Learning and Teaching of the European Educational Research Association (EERA) which formed the core of the research community in which this work was developed over a five year period (2006-11). The next part of the chapter provides an overview of the six sections which make up the structure of the book as a whole. A discussion then follows of the clear continental divide with respect to didactics, learning and teaching in the European landscape which is based on the references used by the contributors to this book. This leads to a consideration of the historical origin of present-day didactics which can be traced back to a common heritage in the work of Jan Amos Comenius (1592-1670) in order to provide a platform in the search for common ground. In the section which then follows there is a discussion of the didactic triad as a tool for holding the complexity of teaching-studying-learning situations and this is considered in an expanded context in which classroom interaction in the school is placed within a wider societal context. Based on a review of the contributions to this book, the final parts of this chapter consider existing knowledge gaps between different national traditions and also identify themes that form the basis for building and extending common ground. The themes that have been identified through this process of synthesis relate to pedagogical content knowledge, learner knowledge, joint didactical action, curriculum research, the so called shift from teaching to learning, the philosophy of Bildung and its practical implications, links between theory and practice and the significant role of experimental schools. Finally these themes are proposed for consideration within the wider research, policy and practice community as the basis for future international co-operation that offer the potential to advance mutual understanding and common insights in this fiel
A view on Didactics and Instructional Planning from the Perspective of research on learner development and educational experience
First, the author gives a short description of the current German situation with respect to educational research (‘empirische Bildungsforschung’), to general didactics (‘Allgemeine Didaktik’), and to research on learner development and educational experience (‘Bildungsgangforschung’) in particular. Then, the didactics for the third field of study, ‘Bildungsgangforschung’, are described, and an example of instructional analysis from this perspective is given: an English class at senior high school (upper secondary stage). The example is of help for one of the central concepts of ‘Bildungsgangforschung’, the description of authentic student participation. With reference to the example, and going beyond, the developmental task concept is described and defended. Quality criteria for learner development and instructional planning, which are partly based upon empirical data, are proposed. In doing so, particular attention is given to the tension between general education as suggested by Wolfgang Klafki (‘Allgemeinbildung), teachers’ professional developmental tasks, and students’ efforts to achieve the developmental tasks adequate for their age group. A graduated model of instructional cooperation for the description and evaluation of classroom instruction from the point of view of learner development and educational experience is used for a reflective final step
Measurement of the photon polarization in decays
The photon polarization in transitions is measured for the
first time in radiative b-baryon decays exploiting the unique spin structure of
decays. A data sample corresponding to an
integrated luminosity of collected by the LHCb experiment in
collisions at a center-of-mass energy of is used. The photon
polarization is measured to be , where the first uncertainty is
statistical and the second systematic. This result is in agreement with the
Standard Model prediction and previous measurements in b-meson decays.
Charge-parity breaking effects are studied for the first time in this
observable and found to be consistent with symmetry.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-2021-030.html (LHCb
public pages
Observation of Two New Excited Ξb0 States Decaying to Λb0 K-π+
Two narrow resonant states are observed in the Λb0K-π+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb-1. The minimal quark content of the Λb0K-π+ system indicates that these are excited Ξb0 baryons. The masses of the Ξb(6327)0 and Ξb(6333)0 states are m[Ξb(6327)0]=6327.28-0.21+0.23±0.12±0.24 and m[Ξb(6333)0]=6332.69-0.18+0.17±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41-0.27+0.26±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λb0 mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξb(6327)0]<2.20(2.56) and Γ[Ξb(6333)0]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξb0 resonances
Study of the psi(2)(3823) and chi(c1)(3872) states in B+->(J/psi pi(+)pi(-))K(+)decays
The decays are studied using a data
set corresponding to an integrated luminosity of 9fb collected with the
LHCb detector in proton-proton collisions between 2011 and 2018. Precise
measurements of the ratios of branching fractions with the intermediate
, and states are reported. The decay
of with is observed for the first time with a significance of 5.1
standard deviations. The mass differences between the ,
and states are measured to be resulting in the
most precise determination of the mass. The width of the
state is found to be below 5.2MeV at 90\% confidence level. The
Breit-Wigner width of the state is measured to be which is inconsistent with zero by 5.5 standard deviations.Comment: 26 pages, 3 figures. All figures and tables, along with any
supplementary material and additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-009.html (LHCb
public pages
Angular analysis of and decays and search for violation
The first full angular analysis and an updated measurement of the decay-rate
asymmetry of the and decays are reported. The analysis uses proton-proton
collision data collected with the LHCb detector at centre-of-mass energies of
7, 8 and 13 TeV. The data set corresponds to an integrated luminosity of 9
fb. The full set of -averaged angular observables and their
asymmetries are measured as a function of the dimuon invariant mass. The
results are consistent with expectations from the standard model and with
symmetry.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-035.html (LHCb
public pages
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