Speaker
Laura Tolos
(U)
Description
The LHCb Collaboration has discovered five excited $\Omega_c$ states with masses between 3 and 3.1 GeV [1], four of them recently corroborated by the Belle Collaboration [2]. Moreover, the LHCb Collaboration has recently reported one $\Xi_b(6227)$ state [3], whereas several $\Xi_c$ states are described in the PDG. Indeed, one $\Xi_c$ at 2930 MeV was first reported by the BaBar Collaboration [4] and recently confirmed by the Belle Collaboration [5].
We analyze the dynamical generation of $\Omega_c$ as well as $\Xi_c$ and $\Xi_b$ states within a molecular baryon-meson model that is consistent with both chiral and heavy-quark spin symmetries. Earlier predictions within this model found several $\Omega_c$, $\Xi_c$ and $\Xi_b$ states with masses below the experimental observations [6,7]. Thus, in order to study the possible identification of any of these states with the experimental ones in the correct energy region, we explore the effect of the renormalization scheme. We analyze which states could be dynamically generated and identified with the experimental ones while having spin-parity $J=1/2^-$ or $J=3/2^-$ [8,9].
[1] R. Aaij et al. [LHCb Collaboration], Phys. Rev. Lett. 118, 182001 (2017).
[2] J. Yelton et al. [Belle Collaboration], Phys. Rev. D 97, 051102 (2018).
[3] R. Aaij et al. [LHCb Collaboration], Phys. Rev. Lett. 121, 072002 (2018).
[4] B. Aubert et al. [BaBar Collaboration], Phys. Rev. D 77, 031101 (2008).
[5] Y. B. Li et al. [Belle Collaboration], Eur. Phys. J. C 78, 252 (2018).
[6] O. Romanets, L. Tolos, C. Garcia-Recio, J. Nieves, L. L. Salcedo and R. G. E. Timmermans, Phys. Rev. D 85, 114032 (2012).
[7] C. Garcia-Recio, J. Nieves, O. Romanets, L.L. Salcedo and L. Tolos, Phys.Rev. D 87 (2013) 3, 034032
[8] J. Nieves, R. Pavao and L. Tolos, Eur. Phys. J. C 78, 114 (2018).
[9] J. Nieves, R. Pavao and L. Tolos, in preparation.
Primary author
Laura Tolos
(U)
Co-authors
Dr
Juan Nieves
(IFIC (CSIC-UV))
Mr
Rafael Pavao
(IFIC)
