0000000000479319
AUTHOR
Juan Miguel Nieves
Vertical bar V(ub)vertical bar from exclusive semileptonic B -> rho decays
We use Omnes representations of the form factors V, A(1) and A(2) for exclusive semileptonic B -> rho decays, and apply them to combine experimental partial branching fraction information with theoretical calculations of the three form factors to extract vertical bar V-ub vertical bar. We find vertical bar V-ub vertical bar = (2.8 +/- 0.2(stat)+/- 0.5(sys)) x 10(-3). where we have conservatively assumed a 20% systematic error to account for the use of the quenched approximation in the lattice QCD calculations of the form factors. This value of vertical bar V-ub vertical bar is slightly lower than the values extracted from exclusive semileptonic B -> pi decays, (3.47 +/- 0.29 +/- 0.03) x 10(…
Heavy quark spin symmetry and SU(3)-flavour partners of the X (3872)
In this work, an Effective Field Theory (EFT) incorporating light SU(3)-flavour and heavy quark spin symmetries is used to describe charmed meson-antimeson bound states. At Lowest Order (LO), this means that only contact range interactions among the heavy meson and antimeson fields are involved. Besides, the isospin violating decays of the X(3872) will be used to constrain the interaction between the D and a (D) over bar* mesons in the isovector channel. Finally, assuming that the X(3915) and Y(4140) resonances are D* (D) over bar* and D-s* (D) over bar (s)* molecular states, we can determine the four Low Energy Constants (LECs) of the EFT that appear at LO and, therefore, the full spectrum…
Watson's theorem and the $N\Delta(1232)$ axial transition
17 latex pages.- 7 figures.- 2 tables.- Some typos corrected
Properties of D and D-* mesons in the nuclear medium
We study the properties of D and D-* mesons in nuclear matter within a simultaneous self-consistent coupled-channel unitary approach that implements heavy-quark symmetry. The in-medium solution accounts for Pauli blocking effects and for the D and D-* self-energies in a self-consistent manner. We pay special attention to renormalization of the intermediate propagators in the medium beyond the usual cutoff scheme. We analyze the behavior in the nuclear medium of the rich spectrum of dynamically generated baryonic resonances in the C=1 and S=0 sector and their influence on the self-energy and, hence, the spectral function of D and D-* mesons. The D meson quasiparticle peak mixes with Sigma(c)…
Couplings in coupled channels versus wave functions: application to the X(3872) resonance
We perform an analytical study of the scattering matrix and bound states in problems with many physical coupled channels. We establish the relationship of the couplings of the states to the different channels, obtained from the residues of the scattering matrix at the poles, with the wave functions for the different channels. The couplings basically reflect the value of the wave functions around the origin in coordinate space. In the concrete case of the X(3872) resonance, understood as a bound state of D-0(D) over bar*(0) and D+D*(-) (and c.c. From now on, when we refer to D-0(D) over bar*(0), D+D*(-), or D (D) over bar* we are actually referring to the combination of these states with the…