Spectrum of quenched twisted mass lattice QCD at maximal twist

TL;DR

This paper investigates hadron masses in quenched twisted mass lattice QCD at maximal twist, comparing different twist angle definitions and analyzing flavor breaking effects on mass splittings.

Contribution

It provides a comparison of two twist angle definitions and examines flavor breaking effects in quenched twisted mass lattice QCD at maximal twist.

Findings

Maximal twist reduces discretization errors in hadron mass calculations.

Differences between twist angle definitions are analyzed.

Flavor breaking effects are observed in Delta(1232) multiplet mass splittings.

Abstract

Hadron masses are computed from quenched twisted mass lattice QCD for a degenerate doublet of up and down quarks with the twist angle set to pi/2, since this maximally twisted theory is expected to be free of linear discretization errors. Two separate definitions of the twist angle are used, and the hadron masses for these two cases are compared. The flavor breaking, that can arise due to twisting, is discussed in the context of mass splittings within the Delta(1232) multiplet.