Four-quark operators in hadrons
S. Capitani, M. Gockeler, R. Horsley, B. Klaus, W. Kurzinger, D. Petters, D. Pleiter, P. E. L. Rakow, S. Schaefer, A. Schafer, G. Schierholz
Abstract
We present calculations of matrix elements of 4-quark operators in the pion and in the nucleon extracted from quenched Monte Carlo simulations at beta = 6.0 using Wilson fermions. These operators are relevant for higher-twist effects. We are particularly careful to avoid mixing with lower-dimensional operators by choosing appropriate flavour structures.
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