190997456
Spectroscopy, reactions and decay mechanisms of mesons with heavy quarks
[ES] Se presenta en este trabajo un estudio exhaustivo de las propiedades de mesones pesados usando un modelo de quark constituyente no relativista. Nos hemos centrado en la descripcion del espectro y de las desintegraciones electromagneticas, fuertes y debiles. Pueden encontrarse a lo largo de este trabajo la descripcion de las diferentes aproximaciones que se usan y la comparacion de nuestros resultados con los datos experimentales y con los resultados obtenidos a traves de otras aproximaciones. Se ha obtenido una descripcion global bastante razonable del espectro de mesones pesados. Se han hecho algunas asignaciones de los mesones XYZ, explicando otras propiedades de los estados asignados. Se han sugerido ciertas modificaciones al modelo de quark constituyente original. Como la incorporacion al potencial OGE de las correcciones a 1-loop que ha servido para explicar la masa experimental del meson 
D_{s0}^{*}(2317) como un estado c\bar{s}. Tambien, la renormalizacion con condiciones de contorno aplicada al modelo de quark constituyente nos ha servido para desenmaranar la fisica del estado fundamental respecto de la de los estados excitados. Hemos llevado a cabo el calculo de las desintegraciones OZI-permitidas de los mesones pesados. Para ello hemos utilizado dos modelos de desintegracion, el modelo 3P0 y un modelo microscopico. Hemos usado la aproximacion QCDME para calcular transiciones OZI-suprimidas entre estados vector del charmonio y tambien del botomonio. Hemos llevado a cabo un estudio de las desintegraciones semileptonicas de los mesones B y B_{s} yendo a mesones encantados y encantados-extranos, respectivamente, y que estan orbitalmente excitados. El analisis de las desintegraciones no leptonicas del meson B en canales D^{(*)}D_{sJ} tambien se incluye en este trabajo. Se mencionan a continuacion los resultados mas relevantes. La nueva asignacion de la resonancia \psi(4415) como un estado en onda-D dejando el estado 4S al meson X(4360). La dependencia con la escala del parametro libre \gamma del modelo 3P0. La descripcion del meson D_{s1}(2536) como un estado j_{q}=3/2 que explica simultaneamente todas sus propiedades; [EN] An exhaustive study of heavy meson properties within a nonrelativistic constituent quark model has been presented in this dissertation. Within the heavy quark sector, we have focused on the spectroscopy and on the electromagnetic, strong and weak decays. The description of the approaches used and the discussion of our results, comparing them with the experimental data and also with the results coming from different theoretical approaches, can be followed along the work. A quite reasonable global description of the heavy meson spectra has been reached. Some tentative assignments of the XYZ mesons has been done explaining other properties of the assigned states. Certain modifications to the model have been suggested. The inclusion of one-loop QCD corrections to the spin-dependent terms of the OGE has served to explain the lower mass of the D_{s0}^{*}(2317) meson as a canonical c\bar{s}…
122902889
Is chiral symmetry restored in the excited meson spectrum
Abstract The large degeneracy observed in the excited meson spectrum by the Cristal Barrel Collaboration in the experimental data on proton–antiproton annihilation in flight into mesons in the range 1.9–2.4 GeV has been interpreted as a signal of chiral symmetry restoration. In this work we suggest that such degeneracy may be an indication of the confinement potential modification by color screening. The experimental data can be fairly well reproduced in a constituent quark model with a screened linear confinement potential without changing the dynamical quark mass. Observables that could discriminate our model from those which explicitly restore the chiral symmetry are proposed.
119835022
Charmonium states in the string breaking region
We study the properties of excited charmonium states near the confinement string breaking region using a screened confinement potential. Recent data on e+e−→ΛcΛc and e+e−→J/ψππ are discussed. We find that, in this energy region, S and D states became almost degenerated with a narrow width. The measure of these states can contribute to a more accurate knowledge of the confinement interaction.
119200301
The X(3872) and other possible $XYZ$ molecular states
We perform a coupled channel calculation of the $DD^*$ and $c\bar c$ sectors in the framework of a constituent quark model. The interaction for the $DD^*$ states is obtained using the Resonant Group Method (RGM) and the underlying quark interaction model. The coupling with the two quark system is performed using the $^3 P_0$ model. The X(3872) is found as a molecular state with a sizable $c\bar c$ component. A comparison with Belle and BaBar data has been done, finding a good agreement. Other possible molecular molecular states are discussed.
125474497
The role of radially excited charmed mesons in semileptonic B decays
11163043
The nature of the orbitally excited charmed-strange mesons through nonleptonic B → D(*)DsJ(*) decays
The Belle Collaboration has recently reported a study of the decays B ! Ds1(2536) + ¯ D ( ) and has given also estimates of relevant ratios between branching frac- tions of decays B ! D ( ) D ( ) sJ providing important information to check the structure of the D s0 (2317), Ds1(2460) and Ds1(2536) mesons. The disagreement between experimen- tal data and Heavy Quark Symmetry has been used as an indication that D s0 (2317) and Ds1(2460) mesons could have a more complex structure than the canonical cone. We analyze these ratios within the framework of a constituent quark model, which allows us to incorporate the e ects given by finite c-quark mass corrections. Our findings are that while the Ds1(2460) meson could have a sizable non-q ¯ q component, the D s0 (2317) and Ds1(2536) mesons seem to be well described by a pure q ¯ q structure.
118006276
Signatures of air showers induced by gluinos within the context of split-SUSY
It has been proposed recently that, within the framework of split Supersymmetry, long lived gluinos generated in astrophysical sources could be detected using the signatures of the air showers they produce, thus providing a lower bound for their lifetime and for the scale of SUSY breaking. We present the longitudinal profile and lateral spread of -hadron induced extensive air showers and consider the possibility of measuring them with a detector with the characteristics of the Pierre Auger Observatory.