Triangle singularities in B−→K−π−D+s0 and B−→K−π−D+s1

We study the appearance of structures in the decay of the B− into K−π−D+s0(2317) and K−π−D+s1(2460) final states by forming invariant mass distributions of π−D+s0 and π−D+s1 pairs, respectively. The structure in the distribution is associated to the kinematical triangle singularity that appears when the B−→K−K∗0D0 ( B−→K−K∗0D∗0 ) decay process is followed by the decay of the K∗0 into π−K+ and the subsequent rescattering of the K+D0 ( K+D∗0 ) pair forming the D+s0(2317) ( D+s1(2460) resonance. We find this type of non-resonant peaks at 2850MeV in the invariant mass of π−Ds0 pairs from B−→K−π−D+s0(2317) decays and around 3000MeV in the invariant mass of π−D+s1 pairs from B−→K−π−D+s1(2460) decays. By employing the measured branching ratios of the B−→K−K∗0D0 and B−→K−K∗0D∗0 decays, we predict the branching ratios for the processes B− into K−π−D+s0(2317) and K−π−D+s1(2460) , in the vicinity of the triangle singularity peak, to be about 8×10−6 and 1×10−6 , respectively. The observation of this reaction would also give extra support to the molecular picture of the D+s0(2317) and D+s1(2460)

Dynamically Generated Resonances in the Chiral Unitary Approach to Meson Baryon Interaction

In this talk we report on the use of a chiral unitary approach for the interaction of the octets of meson and baryon and the octet of mesons with the decuplet of baryons. Two octets of $J^{\pi}=1/2^-$ baryon states and a singlet are generated dynamically in the first case, resulting in the case of strangeness $S=-1$ in two poles of the scattering matrix close to the nominal $\Lambda(1405)$ resonance. In the second case many resonances are also generated, among them an exotic baryon with S=1 corresponding to a $\Delta K$ resonance. We make suggestions of experiments which could show evidence for the existence of these states.Comment: Talk at the MENU04 Symposium, Beijing, September 200

A methodological approach for prioritizing water reuse projects in agricultural irrigation: a case study in Spain

Water reuse is a strategic priority for Water Authorities in Europe to reduce the pressure on water resources. However, its implementation is lagging behind expectations largely due to financial concerns. In this context, there is a special interest to identify in which specific Wastewater Treatment Plants it would be interesting to add a Water Regeneration Plant, taking account of potential existing clients in the vicinity and the implied costs and benefits. This paper proposes a methodology to quantify the infrastructure and operation costs of project implementation, and the benefits generated by the additional water offer. An algorithm designs the distribution network, allowing for a quick infrastructure cost analysis. The methodology is applied to the Upper Guadiana in Central Spain, where irrigation led to the overexploitation of the local aquifers and the subsequent restrictions on water use. Taking account of the existing Wastewater Treatment Plants, candidate reuse projects are classified according to their benefit/cost ratio, showing large differences according to the location and potential use of the regenerated water. The methodology allows for a quick assessment of the costs and benefits implied in different reuse projects and scenarios, providing science-based evidence to support water policy decisions

Galactoseismology in cosmological simulations: Vertical perturbations by dark matter, satellite galaxies and gas

Only recently, complex models that include the global dynamics from dwarf satellite galaxies, dark matter halo structure, gas infalls, and stellar disk in a cosmological context became available to study the dynamics of disk galaxies such as the Milky Way (MW). We use a MW model from a high-resolution hydrodynamical cosmological simulation named GARROTXA to establish the relationship between the vertical disturbances seen in its galactic disk and multiple perturbations, from the dark matter halo, satellites and gas. We calculate the bending modes in the galactic disk in the last 6 Gyr of evolution. To quantify the impact of dark matter and gas we compute the vertical acceleration exerted by these components onto the disk and compare them with the bending behavior with Fourier analysis. We find complex bending patterns at different radii and times, such as an inner retrograde mode with high frequency, as well as an outer slower retrograde mode excited at different times. The amplitudes of these bending modes are highest during the early stages of the thin disk formation and reach up to 8.5 km s-1 in the late disk evolution. We find that the infall of satellite galaxies leads to a tilt of the disk, and produces anisotropic gas accretion with subsequent star formation events, and supernovae, creating significant vertical accelerations onto the disk plane. The misalignment between the disk and the inner stellar/dark matter triaxial structure, formed during the ancient assembly of the galaxy, creates a strong vertical acceleration on the stars. We conclude that several agents trigger the bending of the stellar disk and its phase spirals in this simulation, including satellite galaxies, dark sub-halos, misaligned gaseous structures, and the inner dark matter profile, which coexist and influence each other, making it challenging to establish direct causality

Gender differences in adventure tourists who practice kayaking in Extremadura

Adventure tourism is among the sectors that has experienced the greatest growth in participation in recent years. In addition, it provides a unique opportunity to generate different benefits for rural populations as well as for the preservation of their environment. The objective of this study was to analyze gender differences in the profile, estimated expenditure, perception of economic impact and satisfaction of adventure tourists visiting the Valle del Jerte (Extremadura, Spain) for kayaking activities. The sample was composed of 511 tourists who kayaked in the Valle del Jerte. Gender differences were analyzed by the Mann-Whitney U test in continuous variables and Pearson’s chi-square test in categorical variables. The predominant profile of the kayaking tourist is Spanish, married, employed, with university education, lives with their partner with children at home, chooses a rural home for accommodation, travels with companions, uses their own car for transportation, spends 550 euros on average, has good perceptions of the economic impact of the activity on the destination and is satisfied with the kayak service received. This information is relevant for public and private organizations as well as for the local community to be able to offer services more oriented to the tourist who engages in these activities, as well as to attract more tourists

Valores antropométricos en niños con celiaquía diagnosticados precozmente

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