Zobrazeno 1 - 10
of 422
pro vyhledávání: '"Palombi F"'
Publikováno v:
JHEP0803:039,2008
We calculate analytically the improvement coefficients of the static axial and vector currents in O(a) improved lattice QCD at one-loop order of perturbation theory. The static quark is described by the hypercubic action, previously introduced in the
Externí odkaz:
http://arxiv.org/abs/0802.0862
Publikováno v:
JHEP0805:065,2008
Using Schroedinger Functional methods, we compute the non-perturbative renormalisation and renormalisation group running of several four-fermion operators, in the framework of lattice simulations with two dynamical Wilson quarks. Two classes of opera
Externí odkaz:
http://arxiv.org/abs/0712.2429
Publikováno v:
PoSLAT2007:366,2007
We report on a non-perturbative study of the scale-dependent renormalization factors of a multiplicatively renormalizable basis of Delta B=2 parity-odd four-fermion operators in quenched lattice QCD. We also present some preliminary results of the ma
Externí odkaz:
http://arxiv.org/abs/0710.2863
Publikováno v:
PoSLAT2007:368,2007
We present results for the non-perturbative renormalisation of four-fermion operators with two flavours of dynamical quarks. We consider both fully relativistic left current-left current operators, and a full basis for $\Delta B=2$ operators with sta
Externí odkaz:
http://arxiv.org/abs/0710.2862
Publikováno v:
Nucl.Phys.B776:258-285,2007
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 the theory and thus check the
Externí odkaz:
http://arxiv.org/abs/hep-lat/0702017
Autor:
ALPHA Collaboration, Dimopoulos, P., Herdoiza, G., Palombi, F., Pena, C., Sint, S., Vladikas, A.
Publikováno v:
PoSLAT2006:158,2006
We apply finite-size recursion techniques based on the Schrodinger functional formalism to determine the renormalization group running of four-fermion operators which appear in the Delta S=2 effective weak Hamiltonian of the Standard Model. Our calcu
Externí odkaz:
http://arxiv.org/abs/hep-lat/0610077
Autor:
Dimopoulos, P., Giusti, L., Hernandez, P., Palombi, F., Pena, C., Vladikas, A., Wennekers, J., Wittig, H.
Publikováno v:
Phys.Lett. B641 (2006) 118-124
We outline a general strategy for the non-perturbative renormalisation of composite operators in discretisations based on Neuberger fermions, via a matching to results obtained with Wilson-type fermions. As an application, we consider the renormalisa
Externí odkaz:
http://arxiv.org/abs/hep-lat/0607028
Publikováno v:
JHEP 0608 (2006) 017
We discuss the renormalisation properties of the complete set of $\Delta B = 2$ four-quark operators with the heavy quark treated in the static approximation. We elucidate the role of heavy quark symmetry and other symmetry transformations in constra
Externí odkaz:
http://arxiv.org/abs/hep-lat/0604014
Publikováno v:
Nucl.Phys.B749:69-108,2006
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 $\Delta S = 2$ four-fermion operator is renormalised multiplicatively. The renormalisation adopted
Externí odkaz:
http://arxiv.org/abs/hep-ph/0601002
Publikováno v:
PoS LAT2005 (2005) 214
We discuss the renormalisation properties of parity-odd Delta B=2 operators with the heavy quark treated in the static approximation. Via twisted mass QCD (tmQCD), these operators provide the matrix elements relevant for the B0-B0bar mixing amplitude
Externí odkaz:
http://arxiv.org/abs/hep-lat/0509008