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The $P_{cs}(4459)$ pentaquark from a combined effective field theory and phenomenological perspective
| dc.contributor.author | PENG, Fang-Zheng | |
| dc.contributor.author | YAN, Mao-Jun | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | SÁNCHEZ SÁNCHEZ, Mario | |
| dc.contributor.author | VALDERRAMA, Manuel Pavon | |
| dc.date.issued | 2021 | |
| dc.description.abstractEn | The 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.iso | en | |
| dc.subject.en | pentaquark: charm | |
| dc.subject.en | charmed baryon | |
| dc.subject.en | strangeness | |
| dc.subject.en | effective field theory | |
| dc.subject.en | heavy quark: symmetry | |
| dc.subject.en | flavor: SU(3) | |
| dc.subject.en | LHC-B | |
| dc.subject.en | numerical calculations | |
| dc.title.en | The $P_{cs}(4459)$ pentaquark from a combined effective field theory and phenomenological perspective | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1140/epjc/s10052-021-09416-x | |
| dc.subject.hal | Physique [physics]/Physique des Hautes Energies - Phénoménologie [hep-ph] | |
| dc.subject.hal | Physique [physics]/Physique des Hautes Energies - Expérience [hep-ex] | |
| dc.subject.hal | Physique [physics]/Physique des Hautes Energies - Réseau [hep-lat] | |
| dc.subject.hal | Physique [physics]/Physique Nucléaire Théorique [nucl-th] | |
| dc.identifier.arxiv | 2011.01915 | |
| bordeaux.journal | Eur.Phys.J.C | |
| bordeaux.page | 666 | |
| bordeaux.volume | 81 | |
| bordeaux.issue | 7 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03022687 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03022687v1 | |
| bordeaux.COinS | ctx_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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