Double strangeness molecular-type pentaquarks from coupled channel dynamics

Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos (ICCUB) Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain

^* e-mail: vladimir@fqa.ub.edu

Published online: 16 February 2024

Abstract

Abstract. The existence of the nucleonic pentaquark resonances P_c (4312), P_c(4380), P_c(4440) and P_c(4457), established by the LHCb collaboration, has been one of the major discoveries in hadron physics in the latest years. This has been followed by the discovery of pentaquarks with one unit of strangeness, P_cs(4338) and P_cs(4457). Most of these states can be understood as hadronic molecules, namely bound states of a sufficiently attractive meson-baryon interaction. A widely used model, based on unitarized meson-baryon amplitudes obtained from vector meson exchange interactions derived from the hidden gauge formalism, which predicted these states prior to their discovery, is also predicting the existence of pentaquarks with double strangeness content, at around 4500 MeV and 4600 MeV [1]. Our model also suggest that one of these double strangeness pentaquarks can be seen in the weak decay of the E_b baryon into J/ΨϕΞ. A detailed study of this reaction is still under investigation, but in these proceedings we shall show some preliminary results, which confirm the possibility of observing traces of S=-2 pentaquark in invariant mass spectra of J/ΨΞ pairs produced in the decays Ξ_b → J/ΨϕΞ.