Strong exciton-photon coupling in large area MoSe2 and WSe2 heterostructures fabricated from two-dimensional materials grown by chemical vapor deposition

Two-dimensional semiconducting transition metal dichalcogenides embedded in optical microcavities in the strong exciton-photon coupling regime may lead to promising applications in spin and valley addressable polaritonic logic gates and circuits. One significant obstacle for their realization is the inherent lack of scalability associated with the mechanical exfoliation commonly used for fabrication of two-dimensional materials and their heterostructures. Chemical vapor deposition offers an alternative scalable fabrication method for both monolayer semiconductors and other two-dimensional materials, such as hexagonal boron nitride. Observation of the strong light-matter coupling in chemical vapor grown transition metal dichalcogenides has been demonstrated so far in a handful of experiments with monolayer molybdenum disulfide and tungsten disulfide. Here we instead demonstrate the strong exciton-photon coupling in microcavities composed of large area transition metal dichalcogenide/hexagonal boron nitride heterostructures made from chemical vapor deposition grown molybdenum diselenide and tungsten diselenide encapsulated on one or both sides in continuous few-layer boron nitride films also grown by chemical vapor deposition. These transition metal dichalcogenide/hexagonal boron nitride heterostructures show high optical quality comparable with mechanically exfoliated samples, allowing operation in the strong coupling regime in a wide range of temperatures down to 4 Kelvin in tunable and monolithic microcavities, and demonstrating the possibility to successfully develop large area transition metal dichalcogenide based polariton devices

Study of the lineshape of the chi(c1) (3872) state

A study of the lineshape of the chi(c1) (3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb(-1) collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate chi(c1)(3872) and psi(2S) mesons from b-hadron decays are selected in the J/psi pi(+)pi(-) decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the chi(c1 )(3872) and psi(2S) states, Delta m, and the width of the chi(c1 )(3872) state, Gamma(Bw), are determined to be (Delta m=185.598 +/- 0.067 +/- 0.068 Mev,)(Gamma BW=1.39 +/- 0.24 +/- 0.10 Mev,) where the first uncertainty is statistical and the second systematic. Using a Flatte-inspired model, the mode and full width at half maximum of the lineshape are determined to be (mode=3871.69+0.00+0.05 MeV.)(FWHM=0.22-0.04+0.13+0.07+0.11-0.06-0.13 MeV, ) An investigation of the analytic structure of the Flatte amplitude reveals a pole structure, which is compatible with a quasibound D-0(D) over bar*(0) state but a quasivirtual state is still allowed at the level of 2 standard deviations

Measurement of the CKM angle γγ in B±→DK±B^\pm\to D K^\pm and B±→Dπ±B^\pm \to D π^\pm decays with D→KS0h+h−D \to K_\mathrm S^0 h^+ h^-

A measurement of $CP$-violating observables is performed using the decays $B^\pm\to D K^\pm$ and $B^\pm\to D \pi^\pm$, where the $D$ meson is reconstructed in one of the self-conjugate three-body final states $K_{\mathrm S}\pi^+\pi^-$ and $K_{\mathrm S}K^+K^-$ (commonly denoted $K_{\mathrm S} h^+h^-$). The decays are analysed in bins of the $D$-decay phase space, leading to a measurement that is independent of the modelling of the $D$-decay amplitude. The observables are interpreted in terms of the CKM angle $\gamma$. Using a data sample corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$ collected in proton-proton collisions at centre-of-mass energies of $7$, $8$, and $13\,\text{TeV}$ with the LHCb experiment, $\gamma$ is measured to be $\left(68.7^{+5.2}_{-5.1}\right)^\circ$. The hadronic parameters $r_B^{DK}$, $r_B^{D\pi}$, $\delta_B^{DK}$, and $\delta_B^{D\pi}$, which are the ratios and strong-phase differences of the suppressed and favoured $B^\pm$ decays, are also reported

Study of the doubly charmed tetraquark T+cc

Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the D0D0π+ mass spectrum just below the D*+D0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar T+cc tetraquark with a quark content of ccu⎯⎯⎯d⎯⎯⎯ and spin-parity quantum numbers JP = 1+. Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*+ mesons is consistent with the observed D0π+ mass distribution. To analyse the mass of the resonance and its coupling to the D*D system, a dedicated model is developed under the assumption of an isoscalar axial-vector T+cc state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the T+cc state. In addition, an unexpected dependence of the production rate on track multiplicity is observed

Pedagogia do esporte e das lutas: em busca de aproximações

A pedagogia do esporte preocupa-se com o estudo sistemático dos processos de ensino e aprendizagem relacionados aos esportes. As lutas corporais também são práticas que devem estar envoltas em contextualizações pedagógicas. Dessa forma, este estudo pretendeu analisar a relação entre as concepções de pedagogia do esporte e o ensino das lutas corporais. Para isso, foi feita uma revisão de literatura com as seguintes temáticas: a abordagem pedagógica do esporte, a pedagogia do esporte e as lutas corporais e considerações acerca da prática pedagógica das lutas corporais. Elaborou-se também formas de pedagogizar as lutas corporais, levando em consideração alguns eixos norteadores: por que ensiná-las, o que ensinar das lutas corporais, como ensiná-las e como avaliá-las. As lutas corporais devem estar envoltas em abordagens pedagógicas focadas nas pessoas que se-movimentam, permitindo aos sujeitos refletir sobre suas ações, ressigniï¬�cando-as e atribuindo sentidos que contribuam para que eles atinjam a autonomia e a emancipação.La pedagogía del deporte se ocupa del estudio sistemático de la enseñanza y el aprendizaje relacionado con el deporte. Las luchas corporales son también prácticas que deben ser envueltas en la contextualización pedagógica. Así, este estudio pretende analizar la relación entre las concepciones de la pedagogía del deporte y la enseñanza de las luchas corporales. Para ello, se realizó una revisión de la literatura con los siguientes temas: el enfoque pedagógico para el deporte, la pedagogía del deporte y las luchas corporales y consideraciones acerca de la práctica pedagógica de las luchas corporales. Se desarrolló también formas de pedagogizar las luchas corporales, teniendo en cuenta algunos principios orientadores: por qué enseñar las luchas corporales, qué enseñar de las luchas corporales, como enseñar las luchas corporales y como evaluar la enseñanza de las luchas corporales. Las luchas corporales deben ser envueltas en enfoques pedagógicos centrados en las personas en movimiento, permitiendo a los sujetos a moverse a reflejar sus propias acciones y darles nuevos sentidos que les ayuden a lograr la autonomía y la emancipación.The sport pedagogy is concerned with the systematic study of the teaching and learning process related to sports. The body's ï¬�ghts are also practices that should be involved in pedagogical contextualization. Thus, this study sought to examine the relationship between the concepts of sport pedagogy and the teaching of body's ï¬�ghts. For this, we made a review of literature with the following topics: the pedagogical approach of sport, the sport pedagogy and the body ï¬�ghts and considerations about the pedagogical practice of body ï¬�ghts. We also establish ways to pedagogized the body ï¬�ghts, considering some guiding principles: why teaching the body ï¬�ghts, what to teach about them, how to teach them and how to evaluated the teaching of them. The body´s ï¬�ghts should be involved in pedagogical approaches focused on the person that is moving, allowing the subjects to reflect about their own actions, re-meaning those actions and giving directions that can help them to reach autonomy and emancipation