Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Guagnelli, Marco"'
Publikováno v:
Phys. Rev. D 99, 034508 (2019)
We investigate the non-perturbative features of $\phi^4_2$ theory in two dimensions, using Monte Carlo lattice methods. In particular we determine the ratio $f_0 \equiv g/\mu^2$, where g is the unrenormalised coupling, in the infinite volume and cont
Externí odkaz:
http://arxiv.org/abs/1807.03381
Autor:
De Palma, Barbara, Guagnelli, Marco
We study the critical region of the $O(2)\,\phi^4$ theory by means of Monte Carlo simulations on the lattice. In particular we determine the ratio $\Delta\langle\phi^2\rangle_c/g$ in order to estimate the first correction to the critical temperature
Externí odkaz:
http://arxiv.org/abs/1803.10585
Autor:
De Palma, Barbara, Guagnelli, Marco
We report lattice simulations of $\phi^4_2$ and $O(N)\,\phi^4$ models, performed by means of a Monte Carlo method based on the all-order strong coupling expansion (worm algorithm). The investigation of the non-perturbative features of the $\phi^4$ co
Externí odkaz:
http://arxiv.org/abs/1612.05029
Publikováno v:
Phys. Rev. D 92, 034509 (2015)
We use lattice formulation of $\phi^4$ theory in order to investigate non--perturbative features of its continuum limit in two dimensions. In particular, by means of Monte Carlo calculations, we obtain the critical coupling constant $g/\mu^2$ in the
Externí odkaz:
http://arxiv.org/abs/1506.08587
We present an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets ma
Externí odkaz:
http://arxiv.org/abs/1503.03495
Publikováno v:
Eur.Phys.J.A45:373-388,2010
We analytically calculate weighted azimuthal asymmetries in semi-inclusive lepton-nucleon deep-inelastic scattering and Drell-Yan processes, using transverse-momentum-dependent partonic densities obtained in a diquark spectator model. We compare the
Externí odkaz:
http://arxiv.org/abs/1003.1328
Publikováno v:
Nucl.Phys.B595:44-62,2001
We determine the improvement coefficients b_m and b_a-bp in quenched lattice QCD for a range of beta-values, which is relevant for current large scale simulations. At fixed beta, the results are rather sensitive to the precise choices of parameters.
Externí odkaz:
http://arxiv.org/abs/hep-lat/0009021
Autor:
Guagnelli, Marco, Heitger, Jochen
Publikováno v:
Comput.Phys.Commun. 130 (2000) 12-21
We report on a parallelized implementation of SSOR preconditioning for O(a) improved lattice QCD with Schr\"odinger functional boundary conditions. Numerical simulations in the quenched approximation at parameters in the light quark mass region demon
Externí odkaz:
http://arxiv.org/abs/hep-lat/9910024
Publikováno v:
Nucl.Phys.Proc.Suppl. 83 (2000) 168-172
We review recent work by the ALPHA and UKQCD Collaborations where masses and matrix elements were computed in lattice QCD using Schr\"odinger functional boundary conditions and where the strange quark mass was determined in the quenched approximation
Externí odkaz:
http://arxiv.org/abs/hep-lat/9909098
Publikováno v:
Nucl.Phys. B560 (1999) 465-481
We explain how masses and matrix elements can be computed in lattice QCD using Schr"odinger functional boundary conditions. Numerical results in the quenched approximation demonstrate that good precision can be achieved. For a statistical sample of t
Externí odkaz:
http://arxiv.org/abs/hep-lat/9903040