CORE
COnnecting
REpositories

    134 research outputs found

    Conoscere la conoscenza nell’avventura della complessità. Il contesto teorico della ricerca e il tessuto epistemico

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Questo saggio intende chiarire lo sfondo epistemico che guida tanto le domande quanto le procedure del nostro progetto di ricerca. Si chiarirà il contesto teorico di riferimento attraverso una “scelta di campo” che, entro il dibattito internazionale contemporaneo, privilegia una precisa impostazione epistemica, che verrà illustrata nelle pagine che seguono nell’analizzare le sue ragioni formative nonché le sue radici eziologiche. La metodologica adottata dal gruppo di ricerca, pur nelle specificità disciplinari di ciascun ricercatore, è una epistemologica normativa. Questa scelta deriva dalla convinzione che esista una coerenza fra valori epistemici e concretezza educativa. Comportamenti e valori infatti sono evidenze fortemente condizionate dai modelli siano essi consapevoli o meno. E infatti metodi e strumenti tanto della conoscenza in generale come delle prassi formative in particolare sono determinati dall’idea che abbiamo tanto del reale che stiamo indagando quanto di noi stessi. Insomma, pensiamo che i valori epistemici abbiano una relazione di significato con i comportamenti e che, di conseguenza, siano alla base delle scelte educative. La cognizione, infatti, ha un carattere prassomorfico, ovvero assume le forme del nostro agire concreto, perché la percezione del mondo è ampiamente condizionata dalle prassi umane. Queste considerazioni hanno una rilevanza metodologica di natura epistemica, perché chiariscono principi e procedure di coerenza all’interno e fra la teoria e le pratiche educative
    Archivio istituzionale della ricerca - Università di Ferrara

    Michel Foucault, arqueólogo de las ideas. La Metódica y la Formación

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    In this article we propose a kind of epistemological game, a tentative note, ludic, of the Foucault’s archeological method to trace its possible consequences on the innovations of the educative instances. The ludic sense of our work depends on the imaginative reality. Imagination, in fact, is a presupposition of the transformation. The objective is to propose how the formative work of teachers and students, that irreverent work of derangement of the discourses in which the author indicates us which ways exist to make a work of art out of life. Due to the fact that we consider that the French philosopher ́s individuated methodology is a normative epistemology, we will look for imagining the consequences which said ideas excavation have over the scientific investigation, not only on its historial side, but above all on its pedagogical side, or better, the formation epistemology. Certainly, Focault never manifested formative implications. The educative reflexion is, for us, one concrete epistemology of formation; this is our starting point. The theoretical horizon of reference is hermeneutic and postulates, both in education and knowledge, the elaboration of orientation instruments and critical understanding to transform it.En este artículo proponemos una clase de juego epistemológico, una nota tentativa, lúdica, de análisis del método arqueológico de Foucault para trazar sus consecuencias posibles en el tema de las inovaciones de las instancias educativas. El sentido lúdico de nuestro trabajo se atiene a la esfera de la realidad imaginada. La imaginación de hecho es una presuposición de la trans-formación. El objetivo es proponer como ejercicio formativo a los docentes y estudiantes, esa irreverente obra de desquiciamiento de los discursos, en que el autor nos indica qué maneras existen para hacer de la vida una obra de arte. Debido a que consideramos que la metodología individuada del filósofo francés es una epistemología normativa, buscaremos imaginarnos las consecuencias que tal excavación de las ideas tiene sobre la investigación científica, no sólo en su lado histórico, sino sobre todo en su lado pedagógico, o mejor, de epistemología de la formación. Ciertamente, Foucault no manifestó nunca interés sobre la investigación educativa, pero es innegable que su pensamiento tiene extraordinarias implicaciones formativas. La reflexión educativa es para nosotros, una epistemología concreta de la formación; es este nuestro punto de partida. El horizonte teórico de referencia es hermenéutico y postula, tanto en la educación como en el conocimiento, la elaboración de instrumentos de orientación y de comprensión crítica del mundo, para transformarlo
    Archivio istituzionale della ricerca - Università di Ferrara

    Measurements of K S 0 KS0 {K}_S^0 - K L 0 KL0 {K}_L^0 asymmetries in the decays Λ c + → p K L , S 0 Λc+→pKL,S0 {\Lambda}_c^{+}\to p{K}_{L,S}^0 , p K L , S 0 π + π − pKL,S0π+π− p{K}_{L,S}^0{\pi}^{+}{\pi}^{-} and p K L , S 0 π 0 pKL,S0π0 p{K}_{L,S}^0{\pi}^0

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Abstract Using e + e − annihilation data sets corresponding to an integrated luminosity of 4.5 fb −1, collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we report the first measurements of the absolute branching fractions B Λ c + → p K L 0 B(Λc+→pKL0) \mathcal{B}\left({\Lambda}_c^{+}\to p{K}_L^0\right) = (1.67 ± 0.06 ± 0.04)%, B Λ c + → p K L 0 π + π − B(Λc+→pKL0π+π−) \mathcal{B}\left({\Lambda}_c^{+}\to p{K}_L^0{\pi}^{+}{\pi}^{-}\right) = (1.69 ± 0.10 ± 0.05)%, and B Λ c + → p K L 0 π 0 B(Λc+→pKL0π0) \mathcal{B}\left({\Lambda}_c^{+}\to p{K}_L^0{\pi}^0\right) = (2.02 ± 0.13 ± 0.05)%, where the first uncertainties are statistical and the second systematic. Combining with the known branching fractions of Λ c + → p K S 0 Λc+→pKS0 {\Lambda}_c^{+}\to p{K}_S^0 , Λ c + → p K S 0 π + π − Λc+→pKS0π+π− {\Lambda}_c^{+}\to p{K}_S^0{\pi}^{+}{\pi}^{-} , and Λ c + → p K S 0 π 0 Λc+→pKS0π0 {\Lambda}_c^{+}\to p{K}_S^0{\pi}^0 , we present the first measurements of the K S 0 KS0 {K}_S^0 - K L 0 KL0 {K}_L^0 asymmetries R Λ c + K S , L 0 X = B Λ c + → K S 0 X − B Λ c + → K L 0 X B Λ c + → K S 0 X + B Λ c + → K L 0 X R(Λc+,KS,L0X)=B(Λc+→KS0X)−B(Λc+→KL0X)B(Λc+→KS0X)+B(Λc+→KL0X) R\left({\Lambda}_c^{+},{K}_{S,L}^0X\right)=\frac{\mathcal{B}\left({\Lambda}_c^{+}\to {K}_S^0X\right)-\mathcal{B}\left({\Lambda}_c^{+}\to {K}_L^0X\right)}{\mathcal{B}\left({\Lambda}_c^{+}\to {K}_S^0X\right)+\mathcal{B}\left({\Lambda}_c^{+}\to {K}_L^0X\right)} in charmed baryon decays: R Λ c + p K S , L 0 = − 0.025 ± 0.031 R(Λc+,pKS,L0)=−0.025±0.031 R\left({\Lambda}_c^{+},p{K}_{S,L}^0\right)=-0.025\pm 0.031 , R Λ c + p K S , L 0 π + π − = − 0.027 ± 0.048 R(Λc+,pKS,L0π+π−)=−0.027±0.048 R\left({\Lambda}_c^{+},p{K}_{S,L}^0{\pi}^{+}{\pi}^{-}\right)=-0.027\pm 0.048 and R Λ c + p K S , L 0 π 0 = − 0.015 ± 0.046 R(Λc+,pKS,L0π0)=−0.015±0.046 R\left({\Lambda}_c^{+},p{K}_{S,L}^0{\pi}^0\right)=-0.015\pm 0.046 . No significant asymmetries with statistical significance are observed
    Infoscience - École polytechnique fédérale de Lausanne
    Directory of Open Access Journals
    Archivio istituzionale della ricerca - Università di Ferrara
    GSI Repository

    Search for lepton number violating decays of D s + Ds+ {\textrm{D}}_{\textrm{s}}^{+} → h − h0e+e+

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Abstract Based on 7.33 fb −1 of e + e − collision data collected by the BESIII detector operating at the BEPCII collider at center-of-mass energies from 4.128 to 4.226 GeV, a search for the Majorana neutrino ν m is conducted in the lepton-number-violating decays of D s + Ds+ {D}_{\textrm{s}}^{+} → h − h 0 e + e +. Here, h − represents a K − or π − , and h 0 represents a π 0, K S 0 KS0 {K}_S^0 or ϕ. No significant signal is observed, and the upper limits of their branching fractions at the 90% confidence level are determined to be B B \mathcal{B} ( D s + Ds+ {D}_{\textrm{s}}^{+} → ϕπ − e + e +) < 6.9 × 10 −5, B B \mathcal{B} ( D s + Ds+ {D}_{\textrm{s}}^{+} → ϕK − e + e +) < 9.9 × 10 −5, B B \mathcal{B} ( D s + Ds+ {D}_{\textrm{s}}^{+} → K S 0 KS0 {K}_S^0 π − e + e +) < 1.3 × 10 −5, B B \mathcal{B} ( D s + Ds+ {D}_{\textrm{s}}^{+} → K S 0 KS0 {K}_S^0 K − e + e +) < 2.9 × 10 −5, B B \mathcal{B} ( D s + Ds+ {D}_{\textrm{s}}^{+} → π − π 0 e + e +) < 2.9 × 10 −5 and B B \mathcal{B} ( D s + Ds+ {D}_{\textrm{s}}^{+} → K − π 0 e + e +) < 3.4 × 10 −5. The Majorana neutrino is searched for with different mass assumptions within the range [0.20, 0.80] GeV/c 2 in the decay of D s + Ds+ {D}_{\textrm{s}}^{+} → ϕe + ν m with ν m → π − e +, and the upper limits of the branching fractions at the 90% confidence level are at the level of 10 −5–10 −2, depending on the mass of the Majorana neutrino
    Infoscience - École polytechnique fédérale de Lausanne
    Directory of Open Access Journals

    Search for the radiative decay D s + → γρ 770 + Ds+→γρ(770)+ {D}_s^{+}\to \gamma \rho {(770)}^{+}

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Abstract Using 7.33 fb −1 of e + e − collision data samples collected with the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we search for the radiative decay D s + → γρ 770 + Ds+→γρ(770)+ {D}_s^{+}\to \gamma \rho {(770)}^{+} for the first time. A hint of D s + → γρ 770 + Ds+→γρ(770)+ {D}_s^{+}\to \gamma \rho {(770)}^{+} is observed with a statistical significance of 2.5σ. The branching fraction of D s + → γρ 770 + Ds+→γρ(770)+ {D}_s^{+}\to \gamma \rho {(770)}^{+} is measured to be (2.2 ± 0.9stat. ± 0.2syst. ) × 10 −4, corresponding to an upper limit of 6.1 × 10 −4 at the 90% confidence level
    Infoscience - École polytechnique fédérale de Lausanne
    Directory of Open Access Journals
    Archivio istituzionale della ricerca - Università di Ferrara

    Measurement of the branching fraction of Ds+→ℓ+νℓD^+_s\to \ell^+\nu_\ell via e+e−→Ds∗+Ds∗−e^+e^-\to D^{*+}_{s} D^{*-}_{s}

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Based on 10.64 fb−110.64~\mathrm{fb}^{-1} of e+e−e^+e^- collision data taken at center-of-mass energies between 4.237 and 4.699 GeV with the BESIII detector, we study the leptonic Ds+D^+_s decays using the e+e−→Ds∗+Ds∗−e^+e^-\to D^{*+}_{s} D^{*-}_{s} process. The branching fractions of Ds+→ℓ+νℓ (ℓ=μ,τ)D_s^+\to\ell^+\nu_{\ell}\,(\ell=\mu,\tau) are measured to be B(Ds+→μ+νμ)=(0.547±0.026stat±0.016syst)%\mathcal{B}(D_s^+\to\mu^+\nu_\mu)=(0.547\pm0.026_{\rm stat}\pm0.016_{\rm syst})\% and B(Ds+→τ+ντ)=(5.60±0.16stat±0.20syst)%\mathcal{B}(D_s^+\to\tau^+\nu_\tau)=(5.60\pm0.16_{\rm stat}\pm0.20_{\rm syst})\%, respectively. The product of the decay constant and Cabibbo-Kobayashi-Maskawa matrix element ∣Vcs∣|V_{cs}| is determined to be fDs+∣Vcs∣=(246.5±5.9stat±3.6syst±0.5input)μν MeVf_{D_s^+}|V_{cs}|=(246.5\pm5.9_{\rm stat}\pm3.6_{\rm syst}\pm0.5_{\rm input})_{\mu\nu}~\mathrm{MeV} and fDs+∣Vcs∣=(252.7±3.6stat±4.5syst±0.6input))τν MeVf_{D_s^+}|V_{cs}|=(252.7\pm3.6_{\rm stat}\pm4.5_{\rm syst}\pm0.6_{\rm input}))_{\tau \nu}~\mathrm{MeV}, respectively. Taking the value of ∣Vcs∣|V_{cs}| from a global fit in the Standard Model, we obtain fDs+=(252.8±6.0stat±3.7syst±0.6input)μν{f_{D^+_s}}=(252.8\pm6.0_{\rm stat}\pm3.7_{\rm syst}\pm0.6_{\rm input})_{\mu\nu} MeV and fDs+=(259.2±3.6stat±4.5syst±0.6input)τν{f_{D^+_s}}=(259.2\pm3.6_{\rm stat}\pm4.5_{\rm syst}\pm0.6_{\rm input})_{\tau \nu} MeV, respectively. Conversely, taking the value for fDs+f_{D_s^+} from the latest lattice quantum chromodynamics calculation, we obtain ∣Vcs∣=(0.986±0.023stat±0.014syst±0.003input)μν|V_{cs}| =(0.986\pm0.023_{\rm stat}\pm0.014_{\rm syst}\pm0.003_{\rm input})_{\mu\nu} and ∣Vcs∣=(1.011±0.014stat±0.018syst±0.003input)τν|V_{cs}| = (1.011\pm0.014_{\rm stat}\pm0.018_{\rm syst}\pm0.003_{\rm input})_{\tau \nu}, respectively.Comment: 27 pages, 13 figure
    arXiv.org e-Print Archive
    Infoscience - École polytechnique fédérale de Lausanne

    Study of Φ → K(k)over-bar and K<sub>s</sub><sup>0</sup> - K<sub>l</sub><sup>0</sup> Asymmetry in the Amplitude Analysis of D<sub>s</sub><sup>+</sup> → K<sub>s</sub><sup>0</sup>k<sub>l</sub><sup>0</sup>π<sup>+</sup> Decays

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Using e(+)e(-) annihilation data corresponding to a total integrated luminosity of 7.33 fb(-1) collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we provide the first amplitude analysis and absolute branching fraction measurement of the hadronic decay Dthorns. K0SK0Lpthorn. The branching fraction of D-s(+) -> (KSKL0)-K-0 pi(+) is determined to be (1.86 +/- 0.06(stat) +/- 0.03(syst))%. Combining the B [D-s(+) -> phi((KSKL0)-K-0)pi(+) ] obtained in this Letter and the world average of B[D-s(+) ->phi (-> K+K-)pi(+)], we measure the relative branching fraction B( phi -> (KSKL0)-K-0)/B( phi -> K+K- ) = (0.593 +/- 0.023(stat) +/- 0.014(syst +/-) 0.016(phi pi)), where the third error is due to the uncertainty of the B(D-s(+) -> phi pi(+), phi -> K+K-). Our result deviates from the Particle Data Group value by more than 3 sigma. Furthermore, the asymmetry of the branching fractions of D-s(+) -> (KSK)-K-0*(892)(+) and D-s(+) -> (KLK)-K-0*(892)(+), ({B[D-s(+) -> (KSK)-K-0*(892)(+)] -B[D-s(+) -> (KLK)-K-0*(892)(+)]}/{B[D-s(+) -> (KSK)-K-0*(892)(+)] + B[D-s(+) -> (KLK)-K-0*(892)(+)]}), is determined to be (-14.5 +/- 5.1(stat) +/- 1.8(syst))%.LPHE-L
    Infoscience - École polytechnique fédérale de Lausanne

    Observation of ηc (1 S,2 S) and χcJ decays to 2 (π+π-)η via ψ (3686) radiative transitions

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Based on (2712.4±14.1)×106 ψ(3686) decays collected with the BESIII detector, we have observed, for the first time, the hadronic decays of S- and P-wave charmonium states into 2(π+π-)η via radiative transitions from ψ(3686). The branching fraction of the decay ηc(1S)→2(π+π-)η has a significant dependence on the interference pattern between ηc(1S) and non-ηc(1S) processes. We measure it in both the destructive and constructive interference scenarios for the first time. The mass and width of the ηc(1S) are measured to be M=(2984.14±0.13±0.38) MeV/c2 and Γ=(28.82±0.11±0.82) MeV, respectively. Clear signals for the decays of the χcJ(J=0,1,2) and the ηc(2S) to 2(π+π-)η are also observed for the first time, and the corresponding branching fractions are measured. The ratio of the branching fractions between the ηc(2S) and ηc(1S) decays is significantly lower than the theoretical prediction, which might suggest different dynamics in their decays.LPHE-L
    Infoscience - École polytechnique fédérale de Lausanne

    Measurement of the Branching Fractions of D<sup>+</sup> → K<sup>+</sup> K<sup>-</sup> Π<sup>+</sup> Π<sup>+</sup> Π<sup>-</sup>, Φπ<sup>+</sup> Π<sup>+</sup> Π<sup>-</sup>, K<sub>s</sub><sup>0</sup> K<sup>+</sup>π<sup>+</sup>π<sup>-</sup> Π<sup>0</sup>, K<sub>s</sub><sup>0</sup> K<sup>+</sup> Η, and K<sub>s</sub><sup>0</sup> K<sup>+</sup> Ω Decays

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Using 20.3 fb(-1) of e(+)e(-) collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector operating at the BEPCII collider, the branching fractions of three hadronic charm meson decays, D+ ->phi pi(+) pi(+)pi(-), D+ -> K-S(0) K+pi(+)pi(-)pi(0), and D+ -> K-S(0) K+ omega, are measured for the first time to be (0.54 +/- 0.19 +/- 0.02) x 10(-4), (2.51 +/- 0.34 +/- 0.14) x 10(-4), and (2.02 +/- 0.35 +/- 0.10) x10(-4), respectively. Futhermore, the branching fractions of D+ -> K+ K- pi(+) pi(+) pi(-) andD(+) -> K-S(0) K+ eta are measured with improved precision, yielding values of (0.66 +/- 0.11 +/- 0.03) x 10(-4) and (2.27 +/- 0.22 +/- 0.05) x 10(-4), respectively.LPHE-L
    Infoscience - École polytechnique fédérale de Lausanne

    Measurement of the Branching Fractions of the Cabibbo-favored Decays Λ<sub>c</sub><sup>+</sup> → Λ<i>k</i><sub>s</sub><sup>0</sup> <i>k</i><sup>+</sup> and Λ<sub>c</sub><sup>+</sup> → Ξ<sup>0</sup><i>k</i><sub>s</sub><sup>0</sup> Π<sup>+</sup> and Search for Λ<sub>c</sub><sup>+</sup> → Σ<sup>0</sup><i>k</i><sub>s</sub><sup>0</sup> <i>k</i><sup>+</sup>

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Based on e(+)e(-) collision data corresponding to an integrated luminosity of about 4.5 fb(-1) collected at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the absolute branching fraction of the Cabibbo-favored decay Lambda(+)(c) -> Lambda K-S(0) K+ is measured to be (3.12 +/- 0.46 +/- 0.15) x 10(-3). Combined with a previous measurement from the BESIII Collaboration, the branching fraction of the decay Lambda(+)(c) -> Lambda K-S(0) K+ is calculated to be (3.07 +/- 0.26 +/- 0.13) x 10(-3). The decay Lambda(+)(c) -> Xi K-0(S)0 pi(+) is observed for the first time with a statistical significance of 6.6 sigma, and its branching fraction is determined to be (3.70 +/- 0.60 +/- 0.21) x 10(-3). In addition, a search for the decay Lambda(+)(c) -> Sigma K-0(S)0 K+ is performed, and its branching fraction is determined to be (0.80(-0.24)(+0.28) +/- 0.16) x 10(-3), corresponding to an upper limit of 1.28 x 10(-3) at a 90% confidence level. These measurements provide new information that can be used to distinguish between theoretical models.LPHE-L
    Infoscience - École polytechnique fédérale de Lausanne
    • …
    corecore