Twisted-mass lattice QCD with mass non-degenerate quarks

By R. Frezzotti, G. Rossi. 2003

147 citations recorded by the source corpus.

The maximally twisted lattice QCD action of an SUf(2) doublet of mass degenerate Wilson quarks gives raise to a real positive fermion determinant and it is invariant under the product of standard parity times the change of sign of the coefficient of the Wilson term. The existence of this spurionic symmetry implies that O(a) improvement is either automatic or achieved through simple linear combinations of quantities taken with opposite external three-momenta. We show that in the case of maximal twist all these nice results can be extended to the more interesting case of a mass non-degenerate quark pair.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3f4b38441b4213043d2e70d2d092a9655b49f83f

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In Nuclear and High Energy Physics

Citations in the corpus

Light Hadron Masses from Lattice QCD (2012, background): “This implies that at maximal twist on the one hand there are isospin breaking cutoff effects (Bar, 2010; Scorzato, 2004) while on the other hand the cutoff terms are generally of O(a2) (Aoki and Bar, 2004; Frezzotti and Rossi, 2004a).”
Light hadrons from lattice QCD with light (u, d), strange and charm dynamical quarks (2010, background): “Notice however that the positivity of the determinant is guaranteed for μ(2)σ > μ 2 δ [33, 34].”
ΔS=2 and ΔC=2 bag parameters in the standard model and beyond from N$_f$=2+1+1 twisted-mass lattice QCD (2015, methodology): “With similar notations we take the action for the strange and charm quark doublet in the sea [55] to be where µ σ and µ δ are the bare twisted mass parameters from which the renormalized strange and charm masses can be derived.”