Exploring Hidden Charm Pentaquarks: Recent Discoveries and Findings
Delve into the fascinating world of hidden charm pentaquarks with multi-strangeness as Hyun-Chul Kim discusses the construction of quarks and exotics. Discover the heavy exotics and findings of heavy pentaquarks from 2015 to 2023, including the first experimental observations by the LHCb Collaboration. Explore the intriguing realm of heavy tetraquarks and hidden-charm pentaquark states, along with discussions on the observations by LHCb and GlueX collaborations. Uncover the complexities of hidden charm pentaquarks with strangeness and the latest developments in this field, including significant publications and measurements.
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Presentation Transcript
Hidden-charm pentaquarks with multi-strangeness Hyun-Chul Kim Department of Physics, Inha University 0
Quarks and exotics Pentaquark Tetraquark Baryons can now be constructed by using the combinations (qqq), (qqqqq), etc., while mesons are made out of (qq), (qqqq), etc. 2
Heavy exotics Hidden-charm tetraquarks: PRL 91, (2003) Open-charm tetraquarks: Nature Phys. 18, (2022) All heavy tetraquarks: Sci. Bull. 65, (2020) Hidden-charm pentaquarks: LHCb & Belle (Belle II) Open-charm pentaquarks: 3
Findings of Heavy Exotics Hidden-charm pentaquarks 2015-2023 The first measurement of the heavy tetraquark: S.K. Choi et al. (Belle) PRL 91 (2003) 262001 JPAC Coll. 2112.13436 4
First experimental finding The first observation of the hidden-charm pentaquark states by the LHCb Collaboration R.Aaij et al. (LHCb), PRL115 072001 (2015) R.Aaij et al. (LHCb), PRL122 222001 (2019) 6
Four hidden-charm pentaquark states Not confirmed. The width seems to be large. R.Aaij et al. (LHCb), PRL122 222001 (2019) R.Aaij et al. (LHCb), PRL115 072001 (2015) 7
LHCb vs GlueX Null results from the GlueX Collaboration (Jlab): Why? Why? R.Aaij et al. (LHCb), PRL122 222001 (2019) S.Adhikari et al. (GlueX), PRC108, 025201 (2023) 8
Hidden-charm pentaquarks with strangeness S=-1 R.Aaij et al. (LHCb), Sci. Bull. 66, 1278 (2021) 9
Hidden-charm pentaquarks with strangeness S=-1 R.Aaij et al. (LHCb), PRL 131 131, 031901 (2023) 10
Hidden-charm pentaquarks with strangeness S=-1 or ? Adachi et al. (Belle & Belle II), 2502.09951 11
Two questions Two important questions: Why the GlueX experiment cannot see Belle & Belle II experiment: or ? We will try to provide answers to these questions. 12
Coupled-channel integral equation S-matrix: Bethe-Salpeter equation (difficult to solve with off-shellness) Three-dimensional reduction (Not unique) 13
Blankenbecler-Sugar Equation Constructing the Kernel amplitudes based on the effective Lagrangian Heavy-quark spin symmetry Hidden local symmetry for vector mesons Flavor SU(3) symmetry S. Samson, HChK, T. Mart, PRD 110 (2024) 14
Kernel amplitudes No pole diagrams: Hidden-charm pentaquarks are generated dynamically. No u-channel diagrams: Effects of heavy baryon propagators are suppressed. Meson-exchange t-channel diagrams 15
Coupled channels : seven channels (S=0) : nine channels (S=-1) : eleven channels (S=-2) : four channels (S=-2) 16
Hidden-charm pentaquark Pc Coupled channels: Predictions S. Samson, HChK, T. Mart, PRD 110 (2024) 17
Null results from GlueX experiment S.Adhikari et al. (GlueX), PRC108 025201 (2023) R.Aaij et al. (LHCb), PRL122 222001 (2019) 18
Null results from GlueX experiment partial-wave cross section is very small (OZI suppressed). Photon couples strongly to the J/psi channel (vector-meson dominance). OZI suppression: intrinsic strange & charm quark content is very small in the nucleon. Vector-meson dominance S. Samson, HChK, T. Mart, PRD 110 (2024) 19
Null results from GlueX experiment partial-wave cross section is very small (OZI suppressed). Photon couples strongly to the J/psi channel (vector-meson dominance). Transition to open charm processes S. Samson, HChK, T. Mart, PRD 110 (2024) 20
Null results from GlueX experiment Photoproduction of Indeed, we do not see clear resonance structures. Only the cusp structure. S. Samson, S. H. Kim, HChK, in preparation 21
Proposal for using a pion beam The pion and N are strongly coupled to the open-charm channels. In particular, the u-channel is extremely important. t-channel u-channel A possible experiment at J-PARC in Japan S. Samson, HChK, in preparation 22
Hidden-charm pentaquark with strangeness S=-1 Nine coupled channels: with negative parity Spin 3/2 Spin 1/2 S. Samson, HChK, T. Mart, 2504.07693 23
Hidden-charm pentaquark with strangeness S=-1 The Pcs(4472) found by the Belle must be different from Pcs(4459) of the LHCb! S. Samson, HChK, T. Mart, 2504.07693 24
Hidden-charm pentaquark with strangeness S=-2 Eleven coupled channels: S. Samson, HChK, T. Mart, in preparation 25
Hidden-charm pentaquark with strangeness S=-3 Four channels: Two resonances 26
Hidden-charm pentaquark with strangeness S=-3 A possible observation in the J/psi Omega-invariant mass The resonance is located above the J/psi-Omega threshold S. Samson, HChK, T. Mart, in preparation 27
Summary and Conclusions We presented how the coupled-channel formalism explains the dynamical generation of the hidden-charm pentaquark states with multi-strangeness (S=0, -1, -2, -3). We provided possible explanations about the null results from the GlueX experiment (OZI suppression). The Belle & Belle II data: two distinguishable resonances? We proposed the measurement of the hidden-charm pentaquark states using the pion beam. 28
Though this be madness, yet there is method in it. Hamlet Act 2, Scene 2 The present work was done in collaboration with Samson Clymton and Terry Mart. Thank you very much! 29
