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Unconventional Charmonium States: Exploring Threshold Effects

Investigating unconventional charmonium states with unique decay properties, potentially hybrid, molecular, or tetraquark states. Discusses effects of meson-meson thresholds and how they impact quark-antiquark models.

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Unconventional Charmonium States: Exploring Threshold Effects

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  1. HADRON 2015 XVI International Conference on Hadron Spectroscopy Newport News VA, September 2015

  2. CHARMONIUM DESCRIPTION FROM A GENERALIZED SCREENED POTENTIAL MODEL P. González Universitat de València and IFIC (SPAIN)

  3. 13 New Neutral Charmonium States since PDG 2000 8 - 9 X (Unconventional) States K. A.Olive et al. (PDG) Ch. Phys. C86, 090001 (2014)

  4. Conventional States S. Godfrey, N. Isgur PRD 32, 189 (1985)

  5. X(4660) X(4350) X(4360) DD1 X(4260) X(4140-60) D*D*|(2++) X(3915) X(3940) DD*(1++) DD(0++) X(3872) X states :Close-below or Above their First S-wave M-M Threshold

  6. Decay properties of some X states very different from conventionally expected. Conventional description: with parallel properties to However strong decay properties completely different Conventional description: or However aan order of magnitude higher than expected

  7. What are they ? Hybrid (Quark-Antiquark + Gluon) States ? Molecular Sates ? Tetraquarks (compact states) ? Quark-Antiquark + Molecular States ?

  8. What is the effect of Meson-Meson Thresholds ? Can we implement threshold effects within a quark-antiquark model framework? Quark-Antiquark effective potential description implicitly incorporating molecular components. P. G. : J. Phys. G 41,095001 (2014), Phys. Rev. D92, 014017 (2015)

  9. INDEX • Quenched versus Threshold-Unquenched Quark-Antiquark Static Energy from Lattice. Static Potential. ii) Generalized Screened Potential Model (GSPM). iii) Heavy Quarkonia Spectral Description from the GSPM. iv) Summary.

  10. Quenched vs Threshold-Unquenched Quark-Antiquark Energy G. S. Bali et al., PRD 71, 11453 (2005) G. S. Bali, Phis. Rep. 343,1 (2001)

  11. Generalized Screened Potential Model (GSPM)

  12. Cornell potential modulated by thresholds

  13. Possible Shortcomings • Non relativistic potential (effective). • No spin dependent terms in the Cornell potential. • Only screening from meson-meson channels. • No thresholds widths. • No accumulative effect from degenerate thresholds. Applicability:non degenerate isolated thresholds

  14. Heavy Quarkonia Description The lowest lying spectrum is described by the Cornell potential Calculated masses for the lowest lying spin triplet states differing at most 30 MeV (60 MeV) for bottomonium (charmonium).

  15. Charmonium J++ Thresholds

  16. GSPM J++ Spectrum

  17. X(4350) X(4140-60) C(4017) X(3915) X(3872)

  18. Threshold Effect

  19. Attraction + Additional States results from the interaction between and the Cornell state Additionally a new state appears.

  20. Additional States

  21. X(4350) X(4140-60) C(4017) X(3915) X(3872)

  22. Electromagnetic Decays

  23. X(4660) X(4350) X(4360) DD1 X(4260) X(4140-60) D*D*|(2++) X(3915) C(4017) DD*(1++) DD(0++) X(3872)

  24. 1-- Thresholds Overlapping Thresholds

  25. S. Godfrey, N. Isgur PRD 32, 189 (1985) Bottomonium BB1 G(11020) B*B* (2++) BB* (1++) BB (0++)

  26. J++ States P. González, J. Phys. G 41 (2014) 095001

  27. B*B* (2++) BB* (1++) BB (0++)

  28. Summary • There is a spectral puzzle concerning experimentally unconventional charmonium states. • There is a plausible explanation for this puzzle based on an Energy Dependent Quark-antiQuarkPotential from threshold effects. • The Generalized Screened Potential Model (GSPM) based on this potential allows for a reasonable spectral description of J++ charmonium. • New higher energy states in charmonium and bottomoniumare predicted.

  29. THE END

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