Charmonium and XYZ Physics

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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
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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
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Yuan at QWG
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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
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1P1 or hc JPC 1- The hc mass is important to
understanding hyperfine splitting. The hc width
has not been measured
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XYZ States
State JPC Mass Decay Modes
X(3872) 1 3871.20.5 J/? pp-, J/? p p- p0 , J/? ?
X(3872) ??? 3875.50.7 D0 D0 p0 , D0 D
Z(3930) 2 39296 D0 D0, D D-
Y(3940) ? 394317 J/? ?
X(3940) ?? 39429 D D
Y(4008) 1-- 400865 J/? pp-
X(4160) ?? 415627 D D
Y(4260) 1-- 4259,4284,4247 J/? pp-, J/? p0 p0 , J/? K K-
Y(4350) 1-- 4324, 4361 ?(2S) pp-
Z (4430) ?? 44335 ?(2S) p
Y(4620) 1-- 446413 ?(2S) pp-
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X(3872) seen in several J/? channels
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XYZ States

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

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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