Using a unitary extension of chiral perturbation theory with a lowest-order swave SU(3) chiral Lagrangian we study low-energy meson-baryon scattering in the strangeness S = −2 sector. A scattering-matrix pole is found around 1606 MeV which corresponds to an s-wave Ξ resonance with JP = 1/2−. We identify this resonance with the Ξ(1620) state, quoted in the Particle Data Book with I = 1/2 but wit...

The shapes of landscapes are fundamental to ecosystem processes at various spatial scales. Topographic roughness index (TRI) is a measure of variability in the landscape surface and a proxy of the potential of disturbances to propagate across the earth’s surface, such as a wildland fire burning across a landscape. We describe the significance of TRI, present methods for calculation, and demonst...

La navegación mercantil en el Mediterráneo occidental de la primera mitad del siglo XVII ha producido una amplia discusión historiográfica. Los historiadores han querido captar los cambios estructurales que dieron paso a realidad tensiones y colaboraciones por hegemonía diferentes potencias, comprender múltiples actores participantes examinar complejidad marítima periodo. En esa línea, presente...