Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-03-23
Phys.Lett. B619 (2005) 184-191
Physics
High Energy Physics
High Energy Physics - Lattice
10 pages, 8 figures, v2: version accepted for publication in PLB, minor corrections
Scientific paper
We investigate Wilson twisted mass fermions in the quenched approximation using different definitions of the critical bare quark mass m_c to realize maximal twist and, correspondingly, automatic O(a) improvement for physical observables. A particular definition of m_c is given by extrapolating the value of m_c obtained from the PCAC relation at non-vanishing bare twisted quark mass mu to mu=0. Employing this improved definition of the critical mass the Wilson twisted mass formulation provides the possibility to perform reliable simulations down to very small quark masses with correspondingly small pion masses of m_pi \simeq 250 MeV, while keeping the cutoff effects of O(a^2) under control.
Jansen Karl
Papinutto Mauro
Shindler Andrea
Urbach Carsten
Wetzorke Ines
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