1 / 23

Spectra and decays of hybrid charmonia

Spectra and decays of hybrid charmonia. Yu.S.Kalashnikova , ITEP in collaboration with A. Nefediev , PRD77 054025 (2008). Y(4260): hybrid charmonium ?. QCD string model:. Based on Vacuum Correlator Method Confinement: gluonic correlators responsible for

byron-pena
Télécharger la présentation

Spectra and decays of hybrid charmonia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Spectra and decaysof hybrid charmonia Yu.S.Kalashnikova, ITEP in collaboration with A. Nefediev, PRD77 054025 (2008)

  2. Y(4260): hybrid charmonium? Yu.S.Kalashnikova, ITEP

  3. QCD string model: • Based on Vacuum Correlator Method • Confinement: gluoniccorrelators responsible for • area law asymptotic for the Wilson loop • QCD string model corresponds to the limit of small • gluonic correlation length Yu.S.Kalashnikova, ITEP

  4. Excitations of the QCD string:qq -> “minimal” string P = (-1)L+1 C = (-1)L+S Yu.S.Kalashnikova, ITEP

  5. Hybrid excitations:gluon with two “minimal” strings attached Yu.S.Kalashnikova, ITEP

  6. Quantum numbers Magnetic (lg= jg) Electric (lg= jg1) Lowest magnetic Yu.S.Kalashnikova, ITEP

  7. Zero-order Hamiltonian: • quarkonium • hybrid Yu.S.Kalashnikova, ITEP

  8. Einbein fields: 0 -> constituent mass (calculated) Yu.S.Kalashnikova, ITEP

  9. Spin-independent corrections: • Charmonium: • Self-energy • String correction • Hybrid: • Self-energy (the same as for cc) • String correction Yu.S.Kalashnikova, ITEP

  10. Spin-dependent force • non-perturbative spin-orbit (Thomas) • perturbative spin-orbit • hyperfine • spin-tensor Yu.S.Kalashnikova, ITEP

  11. Trial wavefunction • charmonium • hybrid Yu.S.Kalashnikova, ITEP

  12. Model parameters Charmonium spectrum (MeV) Yu.S.Kalashnikova, ITEP

  13. Zero-order hybrid mass: M00= 4573 MeV Constituent masses: c=1598 MeV, g=1085 MeV Spin-independent correction -> -90 MeV Gluon spin-orbit common for all states -> -103 MeV Yu.S.Kalashnikova, ITEP

  14. Predictions for hybrids:1. Spin splittings Yu.S.Kalashnikova, ITEP

  15. Predictions for hybrids:2. Mass of the vector hybrid LGT 4379  149 MeV X.-Q.Luo and Y.Liu, PRD 74 034502 (2006) Yu.S.Kalashnikova, ITEP

  16. Predictions for hybrids:3. Masses of C-even states LGT ~ 4400 MeVC.Michael, hep-ph/0308293 4405  38 MeVY.Liu and X.-Q.Luo PRD73 054510 (2006) Yu.S.Kalashnikova, ITEP

  17. Both these calculations and lattice place a vector hybrid at 4400 MeV Y(4260) is not a hybrid? Y(4320): Yu.S.Kalashnikova, ITEP

  18. Strong decays of magnetic hybrids: D h D Hybrid wavefunction Q-Q  = 0 for S+S mesons Yu.S.Kalashnikova, ITEP

  19. Selection rule: D(*)D(*) hmagnetic D(*)DJ(*) Yu.S.Kalashnikova, ITEP

  20. Vector: Mth=4327 MeV Mth=4285 MeV Yu.S.Kalashnikova, ITEP

  21. Due to the coupling of vector • hybrid to S-wave thresholds D*D0 • and DD1 the state should be attracted • to these thresholds • If the coupling is strong enough • an extra state can be generated • dynamically Y(4260) and Y(4325) ? Yu.S.Kalashnikova, ITEP

  22. J-+: Yu.S.Kalashnikova, ITEP

  23. Y(4260) and Y(4320) as hybrids: No visible decays into DD pairs Small e+e- width The masses are a bit too low DD1 and D*D0 thresholds can attract the state If Y’s are hybrids, C-even partners are to be found 1-+(4320) couples strongly to D*D0 -> interesting threshold effect Yu.S.Kalashnikova, ITEP

More Related