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CLEO-III  spectroscopy

CLEO-III  spectroscopy. Inclusive radiative decays of narrow  resonances (Extraction of inclusive decay rate and  s .) Exclusive decays of  into  h + h - ; h=charged hadron Dipion transitions among  b :  b ’   b . one page primer. 20M (1S) / 10M (2S) / 6M (3S).

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CLEO-III  spectroscopy

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  1. CLEO-III  spectroscopy • Inclusive radiative decays of narrow  resonances (Extraction of inclusive decay rate and s.) • Exclusive decays of  into h+h-; h=charged hadron • Dipion transitions among b: b’b

  2. one page primer 20M (1S) / 10M (2S) / 6M (3S)

  3. Inclusive Direct Photon Production Methodology: 1) Plot inclusive photon spectrum on resonance, 0.45<E/Ebeam<0.95 2) Subtract continuum background (incl ISR) 3) Subtract (using Isospin) photons from p0/h/h’/w decays, use data p+/- as generator. 4) Fit resulting spectrum to a model

  4. Fit to two models: Garcia-Soto (QCD) vs. Field (phenom.) Number Evts “Fragmentation region”| SCET Fit in SCET region

  5. Comparison with previous results Figure-of-Merit=Rg = N(ggg)/N(ggg). Note large model dependence (not considered previously). (2S) and(3S) msrmnts are first!

  6. Extraction of strong coupling constant: R~a(EM)/a(strong); lattice QCD: a(strong)=0.1117(13) Use Q2=M()2, then evolve to Z0-mass Generally good agreement…

  7. Exclusive Radiative  Decays • Exclusives probe gluon-gluon binding • Compare with unquenched lattice QCD predictions for glueballs? • Cross-compare with particle production in two-photon collisions (“anti-search”) • Here, take advantage of excellent particle ID capabilities of CLEO-III detector to discriminate K+K-,  proton-antiproton

  8. Points=on-resonance (1S) solid=below-4S continuum Plot dipion mass in gp+p- evts f2(1525)

  9. Helicity analysis shows f2(1270) dominantly produced helicity=0 state No sign of fJ(2200) or X(1860) claimed by BES in J/y radiatives

  10. b’b • Dipion transitions well-studied in case of transitions between states with L=0 • Formalism should follow that of ’ • Expect partial widths ~1 keV.

  11. b’b • Four different analysis – charged dipion, charged neutral pion, charged “single” pion (2nd [undetected] transition pion reconstructed via 4-C E/p kinematic fit) • Expect Li=Lf; assuming partial widths for all such transitions identicalcan reconstruct expected BR’s using measured E1 b’ BR’s plus theoretical input on expected E1 partial-widths to estimate full widths. • (J’=1J=1)~2.5(J’=2J=2)>>(J’=0J=0)

  12. Signal plotted in 2-dim plot of missing mass vs. higher E transition energy

  13. Combining four analyses – “we are inconsistent with the null hypothesis”

  14. Summary • First measurement of inclusive direct photon production from (2S) and (3S) • First measurement of dipion transitions between states with L>0 • First measurement of several new exclusive radiative decays of (1S) • Bad news – no more running on Upsilon resonances foreseen for CLEO. Good news – if these results are all wrong, it will be a long time before anyone finds out.

  15. Results, using various parametrizations for background. Figure-of-Merit=Rg = N(ggg)/N(ggg). Note large model dependence (not considered previously). (2S) and(3S) msrmnts are first!

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