103 citations · 655 across the 27 of their papers we have counts for
30 papers
First lattice calculation of radiative leptonic decay rates of pseudoscalar mesons
A. Desiderio, R. Frezzotti, M. Garofalo +8
We present a non-perturbative lattice calculation of the form factors which contribute to the amplitudes for the radiative decays , where is a pseudosc…
openQ*D code: a versatile tool for QCD+QED simulations
Isabel Campos, Patrick Fritzsch, Martin Hansen +4
We present the open-source package openQ*D-1.0, which has been primarily, but not uniquely, designed to perform lattice simulations of QCD+QED and QCD, with and without C* boundary…
Real photon emissions in leptonic decays
G. M. de Divitiis, A. Desiderio, M. Di Carlo +11
We present a non-perturbative calculation of the form factors which contribute to the amplitudes for the radiative decays , where is a pseudoscalar mes…
On the extraction of spectral densities from lattice correlators
Martin Hansen, Alessandro Lupo, Nazario Tantalo
Hadronic spectral densities are important quantities whose non-perturbative knowledge allows for calculating phenomenologically relevant observables, such as inclusive hadronic cro…
Chiral Perturbation Theory with an Isosinglet Scalar
Martin Hansen, Kasper Langæble, Francesco Sannino
We present an extension of chiral perturbation theory that explicitly includes an isosinglet scalar in the Lagrangian. The dynamical effects from the scalar state is of phenomenolo…
Gauge invariant determination of charged hadron masses
Martin Hansen, Biagio Lucini, Agostino Patella +1
In this paper we show, for the first time, that charged-hadron masses can be calculated on the lattice without relying on gauge fixing at any stage of the calculations. In our simu…
SU(2) with fundamental fermions and scalars
Martin Hansen, Tadeusz Janowski, Claudio Pica +1
We present preliminary results on the lattice simulation of an SU(2) gauge theory with two fermion flavors and one strongly interacting scalar field, all in the fundamental represe…
openQ*D simulation code for QCD+QED
Isabel Campos, Patrick Fritzsch, Martin Hansen +4
The openQ*D code for the simulation of QCD+QED with C boundary conditions is presented. This code is based on openQCD-1.6, from which it inherits the core features that ens…
Simulations of QCD and QED with C* boundary conditions
Martin Hansen, Biagio Lucini, Agostino Patella +1
We present exploratory results from dynamical simulations of QCD in isolation, as well as QCD coupled to QED, with C* boundary conditions. In finite volume, the use of C* boundary…
SU(3) sextet model with Wilson fermions
Martin Hansen, Claudio Pica
We present our final results for the SU(3) sextet model with the non-improved Wilson fermion discretization. We find evidence for several phases of the lattice model, including a b…
The SU(3) Sextet Model with Wilson Fermions
Martin Hansen, Vincent Drach, Claudio Pica
We investigate the spectrum and IR properties of the SU(3) "sextet" model with two Dirac fermions in the two-index symmetric representation via lattice simulations. This model is a…
Non-perturbative O(a) improvement of the SU(3) sextet model
Martin Hansen
We calculate non-perturbatively the coefficient c_sw required for O(a) improvement of the SU(3) gauge theory with Nf = 2 fermions in the two-index symmetric (sextet) representation…
Composite Higgs Dynamics on the Lattice
Claudio Pica, Vincent Drach, Martin Hansen +1
We investigate the spectrum of the SU(2) gauge theory with = 2 flavors of fermions in the fundamental representation, in the continuum, using lattice simulations. This model…
A simple method to optimize HMC performance
Andrea Bussone, Michele Della Morte, Vincent Drach +4
We present a practical strategy to optimize a set of Hybrid Monte Carlo parameters in simulations of QCD and QCD-like theories. We specialize to the case of mass-preconditioning, w…
Sextet Model with Wilson Fermions
Martin Hansen, Claudio Pica
We present new results from our ongoing study of the SU(3) sextet model with two flavors in the two-index symmetric representation of the gauge group. In the simulations use unimpr…
Extending Chiral Perturbation Theory with an Isosinglet Scalar
Martin Hansen, Kasper Langaeble, Francesco Sannino
We augment the chiral Lagrangian by an isosinglet scalar and compute the one-loop radiative corrections to the pion mass and decay constant, as well as the scalar mass. The calcula…
On reweighting for twisted boundary conditions
Andrea Bussone, Michele Della Morte, Martin Hansen +1
We consider the possibility of using reweighting techniques in order to correct for the breaking of unitarity when twisted boundary conditions are imposed on valence fermions in si…
SU(2) Gauge Theory with Two Fundamental Flavours: a Minimal Template for Model Building
Rudy Arthur, Vincent Drach, Martin Hansen +3
We investigate the continuum spectrum of the SU(2) gauge theory with flavours of fermions in the fundamental representation. This model provides a minimal template which is…
Reweighting twisted boundary conditions
Andrea Bussone, Michele Della Morte, Martin Hansen +1
Imposing twisted boundary conditions on the fermionic fields is a procedure extensively used when evaluating, for example, form factors on the lattice. Twisting is usually performe…
Conformal symmetry vs. chiral symmetry breaking in the SU(3) sextet model
Vincent Drach, Martin Hansen, Ari Hietanen +2
We present new results for the SU(3) "sextet model" with two flavors transforming according to the two-index symmetric representation of the gauge group. The simulations are perfor…
SIMP model at NNLO in chiral perturbation theory
Martin Hansen, Kasper Langaeble, Francesco Sannino
We investigate the phenomenological viability of a recently proposed class of composite dark matter models where the relic density is determined by 3 to 2 number-changing processes…
Composite (Goldstone) Higgs Dynamics on the Lattice: Spectrum of SU(2) Gauge Theory with two Fundamental Fermions
Rudy Arthur, Vincent Drach, Martin Hansen +4
We study the meson spectrum of the SU(2) gauge theory with two Wilson fermions in the fundamental representation. The theory unifies both Technicolor and composite Goldstone Boson…
Scattering lengths in SU(2) gauge theory with two fundamental fermions
R. Arthur, V. Drach, M. Hansen +3
We investigate non perturbatively scattering properties of Goldstone Bosons in an SU(2) gauge theory with two Wilson fermions in the fundamental representation. Such a theory can b…
Consistency tests for Planck and WMAP in the low multipole domain
Anne Mette Frejsel, Martin Hansen, Hao Liu
Recently, full sky maps from Planck have been made publicly available. In this paper, we do consistency tests for the three Planck CMB sky maps. We assume that the difference betwe…