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Four quark operators in maximally twisted Wilson LQCD

Roberto Frezzotti·Giancarlo Rossi
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Abstract

We discuss how the peculiar properties of maximally twisted Wilson fermions can be exploited to set up a consistent LQCD computational scheme in which the CP-conserving matrix elements of the $ΔS =1,2$ effective weak Hamiltonian can be evaluated without mixing with wrong-chirality and/or -parity operators. The proposed lattice framework guarantees automatic O($a$) improvement and positive determinant also for pairs of non-degenerate quarks.

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Roberto Frezzotti, Giancarlo Rossi. 2005-09-27. Four quark operators in maximally twisted Wilson LQCD. https://arxiv.org/abs/hep-lat/0509155

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