Projected Non-perturbative QCD Studies with CLEO-c

• 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.

S. Dytman, Univ. of Pittsburgh for the CLEO collaboration

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What is missing?

• Missing or unconfirmed states– c’, hc, b, 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(p,pp), charm(?), bottom(?)

• Incomplete R data affects (g-2), (MZ)…

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pp

Predictions for charmed hybrid meson

Mass:Juge, Kuti, & Morningstar (’99) 4.24 GeVCP-PACS (’99) 4.39(.1) GeVMILC (’99) 4.27(.15) GeVMILC (’97) 4.39(.08)(.20) GeVBarnes 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- ee~1 keV

Decay from (1S) BR~10-3

D*D D0**D D1

**D D2**D DD

1-- 0.2 0.2 17.5 1 0

1-+ 0.1 2.5 26.2 0.5 0

Que

nched lattice

via e+e-

exotic

Estimates byClose and Swanson

Lattice QCD Advances

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•Improved actions•Better understanding of corrections•Anisotropic lattice•Faster, bigger, cheaper computers

e.g. calculationof glueballspectrum byMorningstar& Peardon

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

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Charmonium spectrum

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Bottomonium Spectrum (PDG)

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Near-Term Upsilon Studies with CLEOIII

↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ b hb b ? ? ? ?

• Proposal under consideration for >4 fb-1

• emphasize (1S), (2S), (3S)• inclusive exotic search• b, hb via , hadronic transitions)

MeasuredPossible?

CLEOII inclusive spectrum + theory (Godfrey/Rosner)for (3S)→b decays

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Br. Ratio x10-4 (3S)→ →b(1S) →b (2S)

Zametakis/Byers (‘83) 22 7.0

Godfrey/Isgur A (‘85) 11 2.2

Godfrey/Isgur B 25 4.7

LNR (‘99) w/o exch 1.4 0.13

LNR (‘99) with exch 0.05 0.4

MARKIII(1986)

BES (1996)

Sometimes it is clear…

The tough life of the fJ(2220)(A case study)

L3 (1997)

??LEAR(1998)

L3 Signal

OPAL (1998)

Other times, not so clear

pp→excitation scan

• Glueball anti-search with 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

5000–

850032pp

530023KSKS

1860046K+K-

1300018

3200074

CLEO-CBES

Multiple directions of attack:

fJ(2220) in CLEO-c?

spectrum from J/ 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

Inclusive Spectrum(Monte Carlo)

Comparison with Other Expts

China:BES II is running now. BES II → BES III upgrade proposedBEPC I → BEPC II upgrade, ~1032 lum. proposedPhysics after 2005 if approval & construction go ahead.

HALL-D at TJNAL:Use p to produce hybrid mesons with exotic Quantum NumbersFocus on light states with JPC= 0+-, 1-+, … Complementary to CLEO-C focus

light glueballs with JPC=0++, 2++, …heavy hybrid mesons

Physics in 2007+ ?

Quantity BES II CLEO-CJ /psi yield 50M > 1000MdE/dx res. 9% 4.9%K/pi separation up to 600 MeV 1500 MeVmomentum res. (500Mev) 1.3% 0.5%Photon resolution (100 Mev) 70 MeV 4 MeVPhoton resolution (1000 Mev) 220 MeV 21 MeVMinimum Photon Energy 80 MeV 30 MeVSolid angle for Tracking 80% 94%Solid angle for Photons 75% 95%

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/ decays (glueballs?)– R measurements– D absolute decay rates, form factors– …….

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