Glimpsing nucleon spectrum

1
Glimpsing nucleon spectrum

• Use of variational method in nucleon sector at
  m? 620 MeV
• States classified according to their lattice
  symmetries
• Proof-of-concept calculation full QCD underway

Lattice symmetries
Adam Lichtl, PhD 2006
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Lattice Opportunities

• Spectrum project of LHPC
• Phase I Volumes to 3.2fm boxes, smallest pion
  mass is 220 MeV
• Lowest-lying nucleon resonances
• Cost of calculation 1.2 Tflop-yr
• Phase II Volumes to 4.0fm, pion masses to 200
  MeV
• Several (more than 2 or 3) low-lying excited
  baryon resonance masses with decay widths,
  nucleon form-factors
• Cost of calculation 7.2 Tflop-yr
• Phase III Volumes to 4 fm, three lattice
  spacings, pion masses down to 180 MeV
• Resonance masses in continuum limit, nucleon
  form-factors Q2 gt 10 GeV2, N-? and Roper
  transition form factors
• Cost of production 36 Tflop-yr

DOE INCITE Award