6035695
The static-light meson spectrum from twisted mass lattice QCD
We compute the static-light meson spectrum with Nf = 2 flavours of sea quarks using Wilson twisted mass lattice QCD. We consider five different values for the light quark mass corresponding to 300MeV < mPS <600MeV and we present results for angular momentum j = 1/2, j = 3/2 and j = 5/2 and for parity P = + and P = −. We extrapolate our results to physical quark masses and make predictions regarding the spectrum of B and Bs mesons.
119282273
Non-perturbative renormalization in coordinate space for Nf=2 maximally twisted mass fermions with tree-level Symanzik improved gauge action
Abstract We present results of a Lattice QCD application of a coordinate space renormalization scheme for the extraction of renormalization constants for flavour non-singlet bilinear quark operators. The method consists in the analysis of the small-distance behaviour of correlation functions in Euclidean space and has several theoretical and practical advantages, in particular: it is gauge invariant, easy to implement and has relatively low computational cost. The values of renormalization constants in the X-space scheme can be converted to the MS ¯ scheme via 4-loop continuum perturbative formulae. Our results for N f = 2 maximally twisted mass fermions with tree-level Symanzik improved gauge action are compared to the ones from the RI-MOM scheme and show full agreement with this method.
53124056
Lattice Monte Carlo methods for systems far from equilibrium
We present a new numerical Monte Carlo approach to determine the scaling behavior of lattice field theories far from equilibrium. The presented methods are generally applicable to systems where classical-statistical fluctuations dominate the dynamics. As an example, these methods are applied to the random-force-driven one-dimensional Burgers' equation - a model for hydrodynamic turbulence. For a self-similar forcing acting on all scales the system is driven to a nonequilibrium steady state characterized by a Kolmogorov energy spectrum. We extract correlation functions of single- and multi-point quantities and determine their scaling spectrum displaying anomalous scaling for high-order moments. Varying the external forcing we are able to tune the system continuously from equilibrium, where the fluctuations are short-range correlated, to the case where the system is strongly driven in the infrared. In the latter case the nonequilibrium scaling of small-scale fluctuations are shown to be universal.
121117362
QCD and hadron structure: A lattice point of view
Abstract Computations of structure functions on the lattice are discussed. We show how moments of parton distribution functions can be obtained from lattice simulations in a fully non-perturbative fashion. Moreover, values of renormalization group invariant matrix elements are evaluated that can serve to compute scal dependent matrix elements in any desired renormalization scheme in the continuum . We give an outlook on several lattice calculations related to structure functions, including generalized parton distributions, form factors and dynamical fermions.
16533811
Two-dimensional lattice Gross-Neveu model with Wilson twisted mass fermions
Abstract We study the two-dimensional lattice Gross–Neveu model with Wilson twisted mass fermions in order to explore the phase structure in this setup. In particular, we investigate the behaviour of the phase transitions found earlier with standard Wilson fermions as a function of the twisted mass parameter μ . We find that qualitatively the dependence of the phase transitions on μ is very similar to the case of lattice QCD.
13691521
Results on the disconnected contributions for hadron structure
7 pages, 15 figures. Proceedings of the Lattice 2014 conference. v2 fixes captions of figures 1 and 2
85579863
Supersymmetry search using Z° bosons produced in neutralino decays at the ATLAS detector