Strange resonance poles from KπK\pi scattering below 1.8 GeV

In this work we present a determination of the mass, width and coupling of the resonances that appear in kaon-pion scattering below 1.8 GeV. These are: the much debated scalar $\kappa$-meson, nowdays known as $K_0^*(800)$, the scalar $K_0^*(1430)$, the $K^*(892)$ and $K_1^*(1410)$ vectors, the spin-two $K_2^*(1430)$ as well as the spin-three $K^*_3(1780)$. The parameters will be determined from the pole associated to each resonance by means of an analytic continuation of the $K\pi$ scattering amplitudes obtained in a recent and precise data analysis constrained with dispersion relations, which were not well satisfied in previous analyses. This analytic continuation will be performed by means of Pad\'e approximants, thus avoiding a particular model for the pole parameterization. We also pay particular attention to the evaluation of uncertainties.Comment: 13 pages, 12 figures. Accepted version to appear in Eur. Phys. J. C. Clarifications and references added, minor typos correcte

Un hombre del renacimiento

Areilza describe una visita a los Baroja, y define a Caro Baroja como un hombre del Renacimiento que se dedicó a la historia, arqueología, a escribir, dibujar y pintarAreilza describes a visit to Baroja, and defines Caro Baroja as a man of the Renaissance that was devoted to the history, archaeology, writing, drawing and paintin

Modelación de la degradación del 2-cloro-metil-propeno por la acción del radical cloro

Anais do IV Encontro de Iniciação Científica da Unila - “UNILA 5 anos: Integração em Ciência, Tecnologia e Cultura na Tríplice Fronteira” - 05 e 06 de novembro de 2015 – Sessão Química, Física e MatemáticaNo presente trabalho foi pesquisada a degradação do composto orgânico volátil 2- cloro-metil-propeno produzida pela reação com átomos de cloro. Foram determinadas duas estruturas de mínimos que garantem a possibilidade da reação do átomo de cloro com os átomos de carbono da ligação dupla. No trabalho são reportadas as geometrias e frequências dos modos normais de vibração dos estados estacionários correspondentes. Foi pesquisada a possível existência de estados de transição vinculados aos mínimos determinados. Para determinar esses estados estacionários foi mapeado o espaço de configuração da molécula, junto com o átomo de cloro, na região das redondezas dos mínimos determinados utilizando cálculos pontuais de energia e otimizações das configurações geométricas prováveis. No foi encontrado nenhum estado de transição associado aos mínimos determinados. O resultado reportado parece indicar que o átomo de cloro entra no poço de potencial do mínimo sem passar por estado de transição. Esse tipo de comportamento tem sido observado em outras reações.bolsa pibic UNIL

The f0(1370) controversy from dispersive meson-meson scattering data analyses

We establish the existence of the long-debated $f_0(1370)$ resonance in the dispersive analyses of meson-meson scattering data. For this, we present a novel approach using forward dispersion relations, valid for generic inelastic resonances. We find its pole at $(1245\pm 40)- i\,(300^{+30}_{-70})$ MeV in $\pi\pi$ scattering. We also provide the couplings as well as further checks extrapolating partial-wave dispersion relations or with other continuation methods. A pole at $(1380^{+70}_{-60})-i\,(220^{+80}_{-70})$ MeV also appears in the $\pi\pi\to K\bar K$ data analysis with partial-wave dispersion relations. Despite settling its existence, our model-independent dispersive and analytic methods still show a lingering tension between pole parameters from the $\pi\pi$ and $K\bar K$ channels that should be attributed to data.Comment: 14 pages, 7 figure

Fat Utilization by the Early Weaned Pig

Animal Scienc

Strange resonance poles from K π scattering below 1.8 GeV

In this work we present a determination of the mass, width, and coupling of the resonances that appear in kaon-pion scattering below 1.8 GeV. These are: the much debated scalar ĸ- meson, nowadays known as K(_1)(*) (800), the scalar K(_1)(*) (1430), the K*(892) and K(_1)(*) (1410) vectors, the spin-two K(_1)(*) (1430) as well as the spin-three K(_1)(*) (1780). The parameters will be determined from the pole associated to each resonance by means of an analytic continuation of the Kπ scattering amplitudes obtained in a recent and precise data analysis constrained with dispersion relations, which were not well satisfied in previous analyses. This analytic continuation will be performed by means of Pade approximants, thus avoiding a particular model for the pole parameterization. We also pay particular attention to the evaluation of uncertainties