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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 - PowerPoint PPT Presentation
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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
Annihilation of pbar p to form each state
All quantum numbers can be formed
Keith Gollwitzer –Fermilab Antiproton Source – Nov 17, 2007
Yuan at QWGYuan at QWG
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
Beam Profiles
Breit-Wigner line shape
Beam Scan of ψ(2S)
Convolution resultsin the observed cross section
Most precise measurement of the ψ(2S) width despite much
smaller statistics than e+e-E835
The precision of the mass and width of the c needs to be improved
E760 & E835 only reported pbarp2photons
Need to observe in more channels
1P1 or hc JPC = 1+-
The hc mass is important to understanding hyperfine
splitting.
The hc width has not been measured
Interference can be your friend
The continuum “amplifies” the resonance
E835 example in 4 photonspbarp c0 π0 π0 , , /
Should expand interference analyses to
more channels; in particular pbarp at 90o
XYZ StatesState JPC Mass Decay ModesX(3872) 1++ 3871.2±0.5 J/ψ π+π-, J/ψ π+ π- π0 , J/ψ γ
X(3872) ??? 3875.5±0.7 D0 D0 π0 , D0 D*
Z(3930) 2++ 3929±6 D0 D0, D+ D-
Y(3940) ?++ 3943±17 J/ψ ω
X(3940) ??+ 3942±9 D D*
Y(4008) 1-- 4008±65 J/ψ π+π-
X(4160) ??+ 4156±27 D* D*
Y(4260) 1-- 4259,4284,4247 J/ψ π+π-, J/ψ π0 π0 , J/ψ K+ K-
Y(4350) 1-- 4324, 4361 ψ(2S) π+π-
Z+ (4430) ?? 4433±5 ψ(2S) π+
Y(4620) 1-- 4464±13 ψ(2S) π+π-
X(3872) seen in several J/ channels
X(3872) seen also in charm meson channels with a slightly different mass
XYZ States• Can precisely measure
– Mass & width (ranging few MeV to ~100MeV)
• Can determine JPC
• What are these states????– Charmonium, hybrids, molecules, tetraquarks
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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