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Charmonium and XYZ Physics

Charmonium and XYZ Physics. Too much to cover in 10 minutes Will show a few topics. Keith Gollwitzer –Fermilab Antiproton Source – Nov 17, 2007. Charmonium and XYZ Physics. Spectroscopy based upon method exploited by Fermilab E760/E835 and to be used at GSI FAIR by PANDA

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Charmonium and XYZ Physics

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  1. Charmonium and XYZ Physics Too much to cover in 10 minutes Will show a few topics Keith Gollwitzer –Fermilab Antiproton Source – Nov 17, 2007

  2. Charmonium and XYZ Physics Spectroscopy based upon method exploited by Fermilab E760/E835 and to be used at GSI FAIR by PANDA Annihilation of pbar p to form each state All quantum numbers can be formed Keith Gollwitzer –Fermilab Antiproton Source – Nov 17, 2007

  3. Yuan at QWG

  4. Charmonium and XYZ Physics Spectroscopy based upon method exploited by Fermilab E760/E835 and to be used at GSI FAIR by PANDA Annihilation of pbar p to form each state All quantum numbers can be formed Scan beam energy to map out resonance Keith Gollwitzer –Fermilab Antiproton Source – Nov 17, 2007

  5. Beam Scan of ψ(2S) Breit-Wigner line shape Convolution results in the observed cross section Most precise measurement of the ψ(2S) width despite much smaller statistics than e+e- Beam Profiles E835

  6. The precision of the mass and width of the c needs to be improved E760 & E835 only reported pbarp2photons Need to observe in more channels

  7. 1P1 or hc JPC = 1+- The hc mass is important to understanding hyperfine splitting. The hc width has not been measured

  8. Interference can be your friend The continuum “amplifies” the resonance E835 example in 4 photons pbarp c0 π0 π0,  , / Should expand interference analyses to more channels; in particular pbarp at 90o

  9. XYZ States

  10. X(3872) seen in several J/ channels

  11. X(3872) seen also in charm meson channels with a slightly different mass

  12. XYZ States • Can precisely measure • Mass & width (ranging few MeV to ~100MeV) • Can determine JPC • What are these states???? • Charmonium, hybrids, molecules, tetraquarks

  13. Charmonium and XYZ Physics The Accumulator can be ready four months after the conclusion of Tevatron Run II Keith Gollwitzer –Fermilab Antiproton Source – Nov 17, 2007

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