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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Predictions for $\Omega_b$ weak decay and $\Xi_{cc}$ molecular states from meson-baryon interaction

20 Aug 2019, 11:30
20m
Duxiu Room (Guilin Bravo Hotel, Guilin, China)

Duxiu Room

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 4: Hadron decays, production and interactions Session 4: Hadron decays, production and interactions

Speaker

Jorgivan Dias (University of Sao Paulo)

Description

We intend to divide this talk into two parts: in the first one, stimulated by the new experimental LHCb findings associated with the $\Omega_c$ states, some of which we have described in previous work as being dynamically generated through meson-baryon interaction, we have extended this approach to make predictions for new $\Xi_{cc}$ molecular states (in the $C = 2$, $S = 0$ and $I = 1/2$ sector). These states manifest themselves as poles in the solution of the Bethe-Salpeter equation in coupled channels. In particular, the kernels of this equation were obtained using the Lagrangians coming from the hidden local gauge symmetry, where the interactions are dominated by the exchange of light vector mesons. The extension of this approach to the heavy sector stems from the realization that the dominant interaction corresponds to having the heavy quarks as spectators, which implies the preservation of the heavy quark symmetry. As a result, we have found several states: two associated with the pseudoscalar meson-baryon interaction with $J^P=1/2^-$, with masses around $4080$ and $4090$ MeV. Furthermore, from the vector meson-baryon interaction we get three states degenerate with $J^P = 1/2^−$ and $3/2^−$ from $4220$ MeV to $4330$ MeV, and two more states around $4280$ MeV and $4410$ MeV, degenerate with $J^P = 1/2^−$, $3/2^−$ and $5/2^−$. On the other hand, in the second part of the talk, we present predictions for the weak decay $\Omega_b \to(\Xi^+_c K^−) \pi^−$, in view of the $\Omega_c(3050)$ and $\Omega_c(3090)$ states, which are generated through the meson-baryon interaction in the $\Xi D$, $\Xi_c K^-$ and $\Xi^{\prime}_c K^-$ coupled channels. Specifically, we investigate the invariant mass distributions of those channels making predictions that could be confronted with future experiments, providing useful information that could help determine the quantum numbers and nature of these states.

Primary author

Jorgivan Dias (University of Sao Paulo)

Co-authors

Prof. Eulogio Oset (IFIC, University of Valencia) Dr Ju-Jun Xie (IMP@CAS) Vinicius Rodrigues Debastiani (IFIC - University of Valencia / CSIC) Dr Wei-Hong LIANG (Guangxi Normal University)

Presentation materials