Quenched scaling of Wilson twisted mass fermions | Zendy

XE Collaboration | Zendy; Karl Jansen | Zendy; Mauro Papinutto | Zendy; Andrea Shindler | Zendy; Carsten Urbach | Zendy; I. Wetzorke | Zendy

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Quenched scaling of Wilson twisted mass fermions

Author(s) -

XE Collaboration,

Karl Jansen,

Mauro Papinutto,

Andrea Shindler,

Carsten Urbach,

I. Wetzorke

Publication year - 2005

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2005/09/071

Subject(s) - pseudoscalar , physics , particle physics , scaling , quark , meson , fermion , pseudoscalar meson , constant (computer programming) , pseudovector , twist , nuclear physics , mathematics , geometry , computer science , programming language

We investigate the scaling behaviour of quenched Wilson twisted mass fermionsat maximal twist applying two definitions of the critical mass. The firstdefinition uses the vanishing of the pseudoscalar meson mass m_PS while thesecond employs the vanishing of the PCAC quark mass m_PCAC. We confirm in bothcases the expected O(a) improvement. In addition, we show that the PCAC quarkmass definition leads to substantially reduced O(a^2) cut-off effects even whenthe pseudoscalar meson mass m_PS is as small as 270 MeV. At a fixed value ofm_PS we perform continuum limits for the vector meson mass m_V and for thepseudoscalar decay constant f_PS and discuss the renormalisation constant Z_Vof the vector current.Comment: 20 pages, 5 figure

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