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Projected Non-perturbative QCD Studies with CLEO-c

Projected Non-perturbative QCD Studies with CLEO-c. S. Dytman, Univ. of Pittsburgh for the CLEO collaboration. QCD is felt to be the theory of strong interaction, BUT… spectroscopy incomplete spectroscopy incomplete

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Projected Non-perturbative QCD Studies with CLEO-c

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  1. Projected Non-perturbative QCD Studies with CLEO-c S. Dytman, Univ. of Pittsburgh for the CLEO collaboration • QCD is felt to be the theory of strong interaction, BUT… • spectroscopy incomplete • spectroscopy incomplete • Exotica predicted, but not convincingly seen (if not seen, must be explained) • Calculations • Empirical quark models describe a wide body of data and predict much more. • Lattice calculations have few results to date, but incredible promise.

  2. What is missing? • Missing or unconfirmed states • hc’, hc, hb, hb, L≥2 states • Poorly known information •  widths, ee coupling, form factor • states at mass >4.0 GeV • Only strong hints of exotica so far • Glueballs ( ) • Hybrid mesons- light quark(pp,pp), charm(?), bottom(?) • Incomplete R data affects (g-2)m, a(MZ)…

  3. Predictions for charmed hybrid meson Mass: Juge, Kuti, & Morningstar (’99) 4.24 GeV CP-PACS (’99) 4.39(.1) GeV MILC (’99) 4.27(.15) GeV MILC (’97) 4.39(.08)(.20) GeV Barnes et al. (’95) Flux tube 4.1-4.2 Decays: Flux tube partial widths (MeV) for M=4.4 GeV Page, Swanson, Szczepaniak (’99) Production: Direct via e+e-Gee~1 keV Decay from (1S) BR~10-3 Quenched lattice via e+e- exotic Estimates by Close and Swanson

  4. Lattice QCD Advances • Improved actions • Better understanding of corrections • Anisotropic lattice • Faster, bigger, cheaper computers e.g. calculation of glueball spectrum by Morningstar & Peardon

  5. CLEOIII collaboration • Albany • CalTech • Carnegie Mellon • Cornell • Florida • Harvard • Illinois • Kansas • Minnesota • Oklahoma • Ohio State • Pittsburgh • Purdue • Rochester • SMU • Syracuse • UTPanAmerican • Vanderbilt • Wayne State 19 institutions ~160 physicists collaboration looks to be largely intact for CLEO-c

  6. CLEOIII detector

  7. Charmonium spectrum

  8. Bottomonium Spectrum (PDG)

  9. Near-Term Upsilon Studies with CLEOIII • Proposalunder consideration for >4 fb-1 • emphasize (1S), (2S), (3S) • inclusive exotic search • hb, hb via g, hadronic transitions) Measured Possible? ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ hb hbcb ? ? ? ?

  10. CLEOII inclusive spectrum + theory (Godfrey/Rosner)for (3S)→g hbdecays

  11. The tough life of the fJ(2220)(A case study) Sometimes it is clear… BES (1996) MARKIII (1986)

  12. Other times, not so clear ?? LEAR (1998) L3 (1997) pp→hh excitation scan OPAL (1998) L3 Signal

  13. fJ(2220) in CLEO-c? BES CLEO-C p+p- 74 32000 p 18 13000 K+K- 46 18600 KSKS 23 5300 pp 32 8500  – 5000 Multiple directions of attack: • Glueball anti-search with gg Data: • CLEO II: B fJ +-/KSKS < 2.5(1.3) eV • CLEO III: sub-eV sensitivity • (1S) decays:Tens of events • Solid PWA of Critical Importance

  14. Inclusive Spectrum(Monte Carlo) •  spectrum from J/y X: • 10-4 sensitivity for narrow resonance • Efficiency for fJ(2220) ~25% • CLEO-c has excellent suppression of hadronic bkg: J/X • 10-4 sensitivity for narrow resonance • Eg: ~25% efficient for fJ(2220) • Suppress hadronic bkg: J/X

  15. Comparison with Other Expts China: BES II is running now. BES II → BES III upgrade proposed BEPC I → BEPC II upgrade, ~1032 lum. proposed Physics after 2005 if approval & construction go ahead. • HALL-D at TJNAL: • Use gp to produce hybrid mesons with exotic Quantum Numbers • Focus on light states with JPC= 0+-, 1-+, … • Complementary to CLEO-C focus • light glueballs with JPC=0++, 2++, … • heavy hybrid mesons • Physics in 2007+ ?

  16. Conclusions • Much to learn in QCD at large distance • Strong coupling field theory • One of the cutting edges of physics • Many advances in theory expected (esp. lattice QCD) • CLEO-c can provide many ground-breaking measurements • spectroscopy • spectroscopy • J/y decays (glueballs?) • R measurements • D absolute decay rates, form factors • …….

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