Baryon Operators and Baryon Spectroscopy

1
Bens slide.
2
Isospin-1/2 N Sector
Capstick and Roberts, PRD58 (1998) 074011
Note ordering.
3
Precise calculation in lattice QCD

• Determine lowest few states for each quantum
  number
• Identify spin and parity in continuum limit

4
Many states in each channel..
Eigenvalues of transfer matrix
Preliminary for illustration!
LHPC
5
Why cascades and lattice QCD?

• States narrow, with strongly attenuated chiral
  effects.
• Cost ' mq2.5

No need to go to light quark masses
6
JLab Lattice QCD Clusters II

• New HEP NP LQCD Facilities money
• 2006
• 2 Tflop machine at FNAL
• 0.4 Tflop machine at JLAB
• 2007
• 3 Tflop machine at JLAB
• 2008, 2009 further machines planned

Jefferson Lab led a multi-lab effort in preparing
the material for the OMB-300 for the national
LQCD collaboration.

• White Paper to DOE, Feb 05, following
  recommendation of 2004 S and T Review - Program
  of lattice studies with milestones linked to 12
  GeV.

7
Optimal Lattice Hadron Program
Coarse a 0.11 fm
Tflop-year m?-7 a-6
fine a 0.09 fm