Charmonium and XYZ Physics

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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