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Charmonium and XYZ Physics: Insights from Fermilab E760/E835 to GSI FAIR

This presentation by Keith Gollwitzer from Fermilab discusses charmonium and XYZ physics, highlighting key topics in the spectroscopy of these states. Covering methods used in experiments at Fermilab's E760 and E835, the talk explores the annihilation of antiprotons and protons to form various states, the mapping of resonances through beam energy scans, and the importance of precise measurements of mass and width for states like ψ(2S) and hc. The potential for new findings at GSI FAIR using the PANDA detector is also mentioned, as is the significance of interference in measurements of XYZ states.

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Charmonium and XYZ Physics: Insights from Fermilab E760/E835 to GSI FAIR

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Presentation Transcript

  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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