350 research outputs found

    EscriVid 2020. Reflexiones y escrituras en torno a pandemia(s) y asilamiento(s)

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    La publicación de EscriVid 2020. Reflexiones en torno a pandemia(s) y aislamiento(s), ha sido posible gracias al trabajo de las coordinadoras del volumen, Guadalupe Reinoso y Alicia Vaggione, especialmente convocadas por el Área de Publicaciones de la Facultad de Filosofía y Humanidades de la Universidad Nacional de Córdoba para esta tarea. Ha sido posible también gracias al trabajo de María Angélica Bella que estuvo a cargo del diseño de interior, de Manuel Coll que estuvo a cargo del diseño de las imågenes y del diseño de tapa y al trabajo impecable (y muy respetuoso) de corrección que hicieron Florencia Colombetti y Lucía Bima. Ha sido posible también gracias al interés deseante de lxs autorxs puestos a estudiar, leer, pensar, escribir. La Oficina de Conocimiento Abierto ha registrado en este Repositorio el aporte de cada autor / autora disponiendo los metadatos que identifican a cada trabajo y el acceso a los textos completos de cada uno de ellos.Fil: Reinoso, Guadalupe. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Escuela de Filosofía; Argentina.Fil: Reinoso, Guadalupe. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones Maria Saleme Burnichón; Argentina.Fil: Reinoso, Guadalupe. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Vaggione, Alicia. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades; Argentina.Fil: Vaggione, Alicia. Universidad Nacional de Córdoba. Facultad de Ciencias Sociales; Argentina

    Capitalismo y pandemia. Notas sobre el tiempo por venir

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    Desde un punto de vista epistemolĂłgico, la pandemia producida por el COVID-19 puede ser interpretada como un acontecimiento de relevancia global. La nociĂłn de acontecimiento ha sido teorizada y empleada de distintos modos en diversas disciplinas, pero siempre vinculada a aquello que irrumpe y produce una discontinuidad en los procesos sociales. Para algunos campos de conocimiento, es una nociĂłn central, como en la historiografĂ­a donde, de una u otra manera, alude tualmente a un evento cuyo calado produce una torsiĂłn histĂłrica en aspectos relevantes de la vida social. Para una mirada semiĂłtica, que concibe la realidad como una trama textual de sentidos, el acontecimiento/pandemia puede ser interpretado como un evento que provoca un hueco en la textura significante, como algo que irrumpe imprevistamente y descompone la trama que da orden y coherencia a la vida de una comunidad. Ese desgarro genera una desorganizaciĂłn en las significaciones corrientes que configuran lo que se entiende por realidad, suscitando desconcierto y confusiĂłn. Esta concepciĂłn semiĂłtica se encuentra muy prĂłxima a la nociĂłn de “real” en Lacan (1977), como una negatividad no representable, que no puede ser expresada a travĂ©s del lenguaje, no formalizable, imposible de capturar por la significaciĂłn, siendo justamente lo que subvierte al lenguaje, lo perturba, lo altera. En sĂ­ntesis, como acontecimiento en clave semiĂłtica o como real en clave lacaniana, aludimos a la rotura de la normalidad, lo que disloca temporalidades, emplazamientos y procedimientos habituales que constituyen la vida cotidiana. AdemĂĄs de las metĂĄforas topogrĂĄficas, uno de los recursos teĂłricos a los cuales se ha recurrido, con frecuencia, para intentar entender el prolongado confinamiento suscitado por el COVID-19, es ese libro extraordinario de Jacques Derrida, titulado Espectros de Marx (1995). AllĂ­, el filĂłsofo francĂ©s recupera el Hamlet (1825) de William Shakespeare, para reflexionar en profundidad sobre lo que implica un tiempo fuera de quicio, lo que presupone una apertura en el presente que habilita un tiempo otro, una temporalidad extraña, abierta, en suspenso, por donde se filtran cuestiones inesperadas y espectrales.Fil: Saur, Daniel Guillermo. Universidad Nacional de CĂłrdoba. Facultad de FilosofĂ­a y Humanidades. Centro de Investigaciones MarĂ­a Saleme BurnichĂłn; Argentina.Fil: Saur, Daniel Guillermo. Universidad Nacional de CĂłrdoba. Facultad de Ciencias Sociales; Argentina

    Amplitude analysis of the B(s)0→K∗0K‟∗0B^0_{(s)} \to K^{*0} \overline{K}^{*0} decays and measurement of the branching fraction of the B0→K∗0K‟∗0B^0 \to K^{*0} \overline{K}^{*0} decay

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    International audienceThe B0→K∗0K‟∗0 {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} and Bs0→K∗0K‟∗0 {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb−1^{−1}. An untagged and timeintegrated amplitude analysis of B_{( s}_{)}^{0}  → (K+^{+}π−^{−})(K−^{−}π+^{+}) decays in two-body invariant mass regions of 150 MeV/c2^{2} around the K∗0^{∗0} mass is performed. A stronger longitudinal polarisation fraction in the B0→K∗0K‟∗0 {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} decay, fL_{L} = 0.724 ± 0.051 (stat) ± 0.016 (syst), is observed as compared to fL_{L} = 0.240 ± 0.031 (stat) ± 0.025 (syst) in the Bs0→K∗0K‟∗0 {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} decay. The ratio of branching fractions of the two decays is measured and used to determine B(B0→K∗0K‟∗0)=(8.0±0.9(stat)±0.4(syst))×10−7 \mathrm{\mathcal{B}}\left({B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0}\right)=\left(8.0\pm 0.9\left(\mathrm{stat}\right)\pm 0.4\left(\mathrm{syst}\right)\right)\times {10}^{-7}

    Measurement of CPCP-violating and mixing-induced observables in Bs0â†’Ï•ÎłB_s^0 \to \phi\gamma decays

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    International audienceA time-dependent analysis of the Bs0â†’Ï•Îł decay rate is performed to determine the CP -violating observables SÏ•Îł and CÏ•Îł and the mixing-induced observable AÏ•ÎłÎ”. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3  fb-1 at center-of-mass energies of 7 and 8 TeV. The measured values are SÏ•Îł=0.43±0.30±0.11, CÏ•Îł=0.11±0.29±0.11, and AÏ•ÎłÎ”=-0.67-0.41+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative Bs0 decays. The results are consistent with the standard model predictions

    Observation of an excited Bc+B_c^+ state

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    International audienceUsing pp collision data corresponding to an integrated luminosity of 8.5  fb-1 recorded by the LHCb experiment at center-of-mass energies of s=7, 8, and 13 TeV, the observation of an excited Bc+ state in the Bc+π+π- invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(Bc+)  MeV/c2, where the last uncertainty is due to the limited knowledge of the Bc+ mass. It is consistent with expectations of the Bc*(2S31)+ state reconstructed without the low-energy photon from the Bc*(1S31)+→Bc+Îł decay following Bc*(2S31)+→Bc*(1S31)+π+π-. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(Bc+)  MeV/c2, and is consistent with the Bc(2S10)+ state. These mass measurements are the most precise to date

    Observation of Several Sources of CPCP Violation in B+→π+π+π−B^+ \to \pi^+ \pi^+ \pi^- Decays

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    International audienceObservations are reported of different sources of CP violation from an amplitude analysis of B+→π+π+π- decays, based on a data sample corresponding to an integrated luminosity of 3  fb-1 of pp collisions recorded with the LHCb detector. A large CP asymmetry is observed in the decay amplitude involving the tensor f2(1270) resonance, and in addition significant CP violation is found in the π+π-S wave at low invariant mass. The presence of CP violation related to interference between the π+π-S wave and the P wave B+→ρ(770)0π+ amplitude is also established; this causes large local asymmetries but cancels when integrated over the phase space of the decay. The results provide both qualitative and quantitative new insights into CP -violation effects in hadronic B decays

    Near-threshold DDˉD\bar{D} spectroscopy and observation of a new charmonium state

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    International audienceUsing proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1^{−1}, collected with the LHCb detector between 2011 and 2018, a new narrow charmonium state, the X(3842) resonance, is observed in the decay modes X(3842)→D0D‟0 \mathrm{X}(3842)\to {D}^0{\overline{D}}^0 and X(3842) → D+^{+}D−^{−}. The mass and the natural width of this state are measured to b

    Measurement of the Λb0→J/ψΛ\Lambda^0_b\rightarrow J/\psi\Lambda angular distribution and the Λb0\Lambda^0_b polarisation in pppp collisions

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    International audienceThis paper presents an analysis of the Λb0 {\Lambda}_b^0 → J/ψΛ angular distribution and the transverse production polarisation of Λb0 {\Lambda}_b^0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1^{−1}, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 {\Lambda}_b^0 transverse momentum and pseudorapidity of 1 < pT_{T}< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 {\Lambda}_b^0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ−^{−} decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration.[graphic not available: see fulltext

    Measurement of the mass difference between neutral charm-meson eigenstates

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    International audienceWe report a measurement of the mass difference between neutral charm-meson eigenstates using a novel approach that enhances sensitivity to this parameter. We use 2.3×106 D0→KS0π+π- decays reconstructed in proton-proton collisions collected by the LHCb experiment in 2011 and 2012. Allowing for CP violation in mixing and in the interference between mixing and decay, we measure the CP-averaged normalized mass difference xCP=[2.7±1.6(stat)±0.4(syst)]×10-3 and the CP-violating parameter Δx=[-0.53±0.70(stat)±0.22(syst)]×10-3. The results are consistent with CP symmetry. These determinations are the most precise from a single experiment and, combined with current world-average results, yield the first evidence that the masses of the neutral charm-meson eigenstates differ

    First Observation of the Radiative Decay Λb0→Λγ\Lambda_{b}^{0} \to \Lambda \gamma

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    International audienceThe radiative decay Λb0→Λγ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of 1.7  fb-1 collected by the LHCb experiment at a center-of-mass energy of 13 TeV. Its branching fraction is measured exploiting the B0→K*0Îł decay as a normalization mode and is found to be B(Λb0→Λγ)=(7.1±1.5±0.6±0.7)×10-6, where the quoted uncertainties are statistical, systematic, and systematic from external inputs, respectively. This is the first observation of a radiative decay of a beauty baryon
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