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
TL;DR
This paper reports on lattice QCD calculations of four-quark operator matrix elements in pions and nucleons, crucial for understanding higher-twist effects in hadron structure.
Contribution
It provides the first quenched lattice QCD estimates of four-quark operator matrix elements with careful operator mixing control.
Findings
Matrix elements calculated for pion and nucleon
Operators relevant for higher-twist effects analyzed
Results help refine theoretical models of hadron structure
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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