Browsing Pure & Applied Mathematics (Scholarly Publications) by Author "SINT, STEFAN"
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The chirally rotated Schrodinger functional with Wilson fermions and automatic O(a) improvement
SINT, STEFAN (2011)A modified formulation of the Schrodinger functional (SF) is proposed. In the continuum it is related to the standard SF by a nonsinglet chiral field rotation and therefore referred to as the chirally rotated SF (?SF). ... 
The chirally rotated Schrödinger functional: theoretical expectations and perturbative tests
SINT, STEFAN (2016)The chirally rotated Schrödinger functional (χSF) with massless Wilsontype fermions provides an alternative lattice regularization of the Schrödinger functional (SF), with different lattice symmetries and a common continuum ... 
Determination of the QCD Î Parameter and the Accuracy of Perturbation Theory at High Energies
SINT, STEFAN (2016)We discuss the determination of the strong coupling α MS ð m Z Þ or, equivalently, the QCD Λ parameter. Its determination requires the use of perturbation theory in α s ð μ Þ in some scheme s and at some ... 
Flavour symmetry restoration and kaon weak matrix elements in quenched twisted mass QCD
SINT, STEFAN (2007)We simulate two variants of quenched twisted mass QCD (tmQCD), with degenerate Wilson quarks of masses equal to or heavier than half the strange quark mass. We use Ward identities in order to measure the twist angles of ... 
Nonperturbative running of the coupling from four flavour lattice QCD with staggered quarks
SINT, STEFAN (2010)Using the Schrodinger functional (SF) with a single staggered fermion field we calculate the SF coupling in fourflavour QCD for a wide range of energies and lattice sizes up to L/a = 16. Preliminary results for the ... 
An O(a) modified lattice setup of the Schrödinger functional in SU(3) gauge theory
SINT, STEFAN (2011)The setup of the QCD Schrödinger functional (SF) on the lattice with staggered quarks requires an even number of points L/a in the spatial directions, while the Euclidean time extent of the lattice, T/a, must be odd. ... 
A precise determination of B_K in quenched QCD
SINT, STEFAN (2006)The B K parameter is computed in quenched lattice QCD with Wilson twisted mass fermions. Two variants of tmQCD are used; in both of them the relevant S = 2 fourfermion operator is renormalised multi ... 
Slow running of the gradient flow coupling from 200??MeV to 4??GeV inNf=3QCD
SINT, STEFAN (2017) 
Testing universality and automatic O(a) improvement in massless lattice QCD with Wilson quarks
SINT, STEFAN (Proceedings of Science, 2010)The chirally rotated Schrodinger functional provides a test bed for universality and automatic O(a) improvement. We here report on extensive quenched simulations of lattice QCD with Wilson quarks in the massless limit. ...