Abstract
The LHCb Collaboration has recently discovered five excited $\Omega_c$ states with masses between 3 and 3.1 GeV, four of them corroborated by the Belle Collaboration. We analyse the dynamical generation of these states within a molecular baryon-meson model that is consistent with both chiral and heavy-quark spin symmetries. Earlier predictions within this model found five $\Omega_c$ states with masses below 3 GeV. Thus, in order to study the possible identification of any of these states with the experimental ones in the correct energy region, we explore two different regularization schemes, that is, a modified regularization subtraction method and a cutoff regularization scheme. We find that at least three of the dynamically generated states can be identified with the experimental ones and have spin-parity $J=1/2^-$ or $J=3/2^-$
Highlights
A Molecular Approach with Heavy-Quark Spin SymmetryInstitut für Theoretische Physik, University of Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany
Five excited Ωc states with masses between 3 and 3.1 GeV have been recently discovered by the LHCb Collaboration [1] in the Ξ+c K − decay in pp collisions, being four of them corroborated by theBelle Collaboration [2]
Predictions on these states have been revisited within quark models, QCD sum-rule schemes, quark-soliton models, lattice QCD and molecular models, so as to understand whether these states can be explained within the conventional quark model picture and/or these states are of molecular type
Summary
Institut für Theoretische Physik, University of Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany. Frankfurt Institute for Advanced Studies, University of Frankfurt, Ruth-Moufang-Str. 1, 60438. Instituto de Fısica Corpuscular (centro mixto CSIC-UV), Institutos de Investigación de Paterna, Aptdo. The LHCb Collaboration has recently discovered five excited Ωc states with masses between 3 and. 3.1 GeV, four of them corroborated by the Belle Collaboration. We analyse the dynamical generation of these states within a molecular baryon-meson model that is consistent with both chiral and heavyquark spin symmetries. Earlier predictions within this model found five Ωc states with masses below
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