Searching for a $$D {\bar{D}}$$ DD¯ bound state with the $$\psi (3770) \rightarrow \gamma D^0 {\bar{D}}^0$$ ψ(3770)→γD0D¯0 decay

We perform a calculation of the mass distribution in the $$\psi (3770) \rightarrow \gamma D {\bar{D}}$$ ψ(3770)→γDD¯ decay, studying both the $$D^+ D^- $$ D+D- and $$D^0 {\bar{D}}^0 $$ D0D¯0 decays. The electromagnetic interaction is such that the tree level amplitude is null for the neutral channel, which forces the $$\psi (3770) \rightarrow \gamma D^0 {\bar{D}}^0$$ ψ(3770)→γD0D¯0 transition to go through a loop involving the $$D^+ D^- \rightarrow D^0 {\bar{D}}^0$$ D+D-→D0D¯0 scattering amplitude. We take the results for this amplitude from a theoretical model that predicts a $$D {\bar{D}}$$ DD¯ bound state and find a $$D^0 {\bar{D}}^0 $$ D0D¯0 mass distribution in the decay drastically di…

Unveiling the K1(1270) double-pole structure in the B¯→J/ψρK¯ and B¯→J/ψK¯*π decays

By looking at the pseudoscalar-vector meson spectra in the $\overline{B}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\rho}\overline{K}$ and $\overline{B}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\overline{K}}^{*}\ensuremath{\pi}$ weak decays, we theoretically investigate the double-pole structure of the ${K}_{1}(1270)$ resonance by using the chiral unitary approach to account for the final-state interactions between the pseudoscalar ($P$) and vector ($V$) mesons. The ${K}_{1}(1270)$ resonance is dynamically generated through these interactions in coupled channels and influences the shape of the invariant mass distributions under consideration. We show how these shapes are affect…

Molecular picture for the Ω ( 2012 ) revisited

We conduct a study of the interaction of the K̄Ξ∗, ηω(s-wave), and K̄Ξ(d-wave) channels within a coupled channel unitary approach where the transition potential between the K̄Ξ∗ and ηω channels is obtained from chiral Lagrangians. The transition potential between K̄Ξ∗, ηω, and K̄Ξ is taken in terms of free parameters, which together with a cutoff to regularize the meson-baryon loops are fitted to the ω(2012) data. We find that all data including the recent Belle experiment on Γω∗→πK̄Ξ/Γω∗→K̄Ξ, are compatible with the molecular picture stemming from meson baryon interaction of these channels.

Theoretical study of the $D^0 \to K^- \pi^+ \eta$ reaction

We develop a model to study the $D^0 \to K^- \pi^+ \eta$ weak decay, starting with the color favored external emission and Cabibbo favored mode at the quark level. A less favored internal emission decay mode is also studied as a source of small corrections. Some pairs of quarks are allowed to hadronize producing two pseudoscalar mesons, which posteriorly are allowed to interact to finally provide the $K^- \pi^+ \eta$ state. The chiral unitary approach is used to take into account the final state interaction of pairs of mesons, which has as a consequence the production of the $\kappa$ ($K^*_0(700)$) and the $a_0(980)$ resonances, very well visible in the invariant mass distributions. We also…

Interpretation of the Ωc→π+Ω(2012)→π+(K¯Ξ) relative to Ωc→π+K¯Ξ from the Ω(2012) molecular perspective

Molecular picture for the $\Omega(2012)$ revisited

We conduct a study of the interaction of the $\bar K \Xi^*$, $\eta \Omega$($s$-wave) and $\bar K \Xi$($d$-wave) channels within a coupled channel unitary approach where the transition potential between the $\bar K \Xi^*$ and $\eta \Omega$ channels is obtained from chiral Lagrangians. The transition potential between $\bar K \Xi^*$, $\eta \Omega$ and $\bar K \Xi$ is taken in terms of free parameters, which together with a cut off to regularize the meson-baryon loops are fitted to the $\Omega(2012)$ data. We find that all data including the recent Belle experiment on $\Gamma_{\Omega^* \to \pi \bar K \Xi}/ \Gamma_{\Omega^* \to \bar K \Xi}$, are compatible with the molecular picture stemming fr…