Effects of Quenching and Partial Quenching on QCD Penguin Matrix Elements
Maarten Golterman, Elisabetta Pallante
TL;DR
This paper examines how quenching and partial quenching alter the chiral properties of penguin operators in QCD, impacting the calculation of weak matrix elements on the lattice using (partially) quenched chiral perturbation theory.
Contribution
It clarifies the change in chiral transformation properties of penguin operators when transitioning from unquenched to (partially) quenched QCD and discusses implications for lattice computations.
Findings
Chiral properties of penguin operators are modified in quenched QCD.
Implications for lattice determination of weak matrix elements are analyzed.
Framework of (partially) quenched chiral perturbation theory is used to understand these effects.
Abstract
We point out that chiral transformation properties of penguin operators change in the transition from unquenched to (partially) quenched QCD. The way in which this affects the lattice determination of weak matrix elements can be understood in the framework of (partially) quenched chiral perturbation theory.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Quantum Chromodynamics and Particle Interactions · Cold Atom Physics and Bose-Einstein Condensates