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dc.contributor.authorPENG, Fang-Zheng
dc.contributor.authorYAN, Mao-Jun
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorSÁNCHEZ SÁNCHEZ, Mario
dc.contributor.authorVALDERRAMA, Manuel Pavon
dc.date.issued2021
dc.description.abstractEnThe observation of the $P_{cs}(4459)$ by the LHCb collaboration adds a new member to the set of known hidden-charm pentaquarks, which includes the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. The $P_{cs}(4459)$ is expected to have the light-quark content of a $\Lambda $ baryon ($I=0$, $S=-1$), but its spin is unknown. Its closeness to the ${\bar{D}}^* \Xi _c$ threshold – $4478\,{\mathrm{MeV}}$ in the isospin-symmetric limit – suggests the molecular hypothesis as a plausible explanation for the $P_{cs}(4459)$. While in the absence of coupled-channel dynamics heavy-quark spin symmetry predicts the two spin-states of the ${\bar{D}}^* \Xi _c$ to be degenerate, power counting arguments indicate that the coupling with the nearby ${\bar{D}} \Xi _c'$ and ${\bar{D}} \Xi _c^*$ channels might be a leading order effect. This generates a hyperfine splitting in which the $J=\tfrac{3}{2}{\bar{D}}^* \Xi _c$ pentaquark will be lighter than the $J=\tfrac{1}{2}$ configuration, which we estimate to be of the order of $5-15\,{\mathrm{MeV}}$. We also point out an accidental symmetry between the $P_{cs}(4459)$ and $P_c(4440/4457)$ potentials. Finally, we argue that the spectroscopy and the $J/\psi \Lambda $ decays of the $P_{cs}(4459)$ might suggest a marginal preference for $J = \tfrac{3}{2}$ over $J = \tfrac{1}{2}$.
dc.language.isoen
dc.subject.enpentaquark: charm
dc.subject.encharmed baryon
dc.subject.enstrangeness
dc.subject.eneffective field theory
dc.subject.enheavy quark: symmetry
dc.subject.enflavor: SU(3)
dc.subject.enLHC-B
dc.subject.ennumerical calculations
dc.title.enThe $P_{cs}(4459)$ pentaquark from a combined effective field theory and phenomenological perspective
dc.typeArticle de revue
dc.identifier.doi10.1140/epjc/s10052-021-09416-x
dc.subject.halPhysique [physics]/Physique des Hautes Energies - Phénoménologie [hep-ph]
dc.subject.halPhysique [physics]/Physique des Hautes Energies - Expérience [hep-ex]
dc.subject.halPhysique [physics]/Physique des Hautes Energies - Réseau [hep-lat]
dc.subject.halPhysique [physics]/Physique Nucléaire Théorique [nucl-th]
dc.identifier.arxiv2011.01915
bordeaux.journalEur.Phys.J.C
bordeaux.page666
bordeaux.volume81
bordeaux.issue7
bordeaux.peerReviewedoui
hal.identifierhal-03022687
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03022687v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Eur.Phys.J.C&rft.date=2021&rft.volume=81&rft.issue=7&rft.spage=666&rft.epage=666&rft.au=PENG,%20Fang-Zheng&YAN,%20Mao-Jun&S%C3%81NCHEZ%20S%C3%81NCHEZ,%20Mario&VALDERRAMA,%20Manuel%20Pavon&rft.genre=article


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