Parity projection of QCD sum rules for the nucleon

Understand

The nucleon and its negative-parity excited states are examined in a maximum entropy method analysis of QCD sum rules.

• First, we rederive the parity projected sum rules for baryons using forward correlation functions.
• Doing this, the method is generalized so that higher order operator product expansion (OPE) terms can be calculated unambiguously.
• We then apply this approach to the nucleon channel taking into account all known first order alpha_s corrections to the Wilson coefficients of the OPE.