0000000001130058
AUTHOR
P. Fernandez-soler
The negative-parity spin-1/2 Λ baryon spectrum from lattice QCD and effective theory
The spectrum of the negative-parity spin-1/2 $\Lambda$ baryons is studied using lattice QCD and hadronic effective theory in a unitarized coupled-channel framework. A direct comparison between the two approaches is possible by considering the hadronic effective theory in a finite volume and with hadron masses and mesonic decay constants that correspond to the situation studied on the lattice. Comparing the energy level spectrum and $SU(3)$ flavor decompositions of the individual states, it is found that the lowest two states extracted from lattice QCD can be identified with one of the two $\Lambda(1405)$-poles and the $\Lambda(1670)$ resonance. The quark mass dependences of these two lattic…
The ρ(ω)B∗(B) interaction and states of J=0,1,2
In this work, we study systems composed of a ρ/ω and B∗ meson pair. We find three bound states in isospin, spin-parity channels (1/2,0+) , (1/2,1+) , and (1/2,2+) . The state with J=2 can be a good candidate for the B2∗(5747) . We also study the ρB system, and a bound state with mass 5728 MeV and width around 20 MeV is obtained, which can be identified with the B1(5721) resonance. In the case of I=3/2 , one obtains repulsion and, thus, no exotic (molecular) mesons in this sector are generated in the approach.
$D_{s0}^{*}(2317)^+$ in the decay of $B_c$ into $J/\psi DK$
In this paper we study the relationship between the $D_{s0}^{*}(2317)^+$ resonance and the decay of the $B_c$ meson into $J/\psi DK$. In this process, the $B_c$ meson decays first into $J/\psi$ and the quark pair $c\bar{s}$, and then the quark pair hadronizes into $DK$ or $D_s\eta$ components, which undergo final state interaction. This final state interaction, generating the $D_{s0}^{*}(2317)^+$ resonance, is described by the chiral unitary approach. With the parameters which allow us to match the pole position of the $D_{s0}^{*}(2317)^+$, we obtain the $DK$ invariant mass distribution of the decay $B_c\to J/\psi DK$, and also the rate for $B_c\to J/\psi D_{s0}^{*}(2317)$. The ratio of the…