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Symplectic lattice gauge theories in the Grid framework: domain wall fermions and continuum extrapolations
Ed Bennett, Peter A. Boyle, Luigi Del Debbio +10
We report the results of the first numerical lattice study using domain-wall fermions in the Sp(4) gauge theory coupled to two flavours of (Dirac) fermions, transforming in the fun…
Chimera baryons and mesons on the lattice: a spectral density analysis
Ed Bennett, Luigi Del Debbio, Niccolò Forzano +10
We develop and test a spectral-density analysis method, based on the introduction of smeared energy kernels, to extract physical information from two-point correlation functions co…
Approaches to the Inverse Problem
Luigi Del Debbio, Alessandro Lupo, Marco Panero +1
The analytical continuation of correlation functions from imaginary to real time is a crucial step in lattice gauge theories, and it challenges our ability to derive non-perturbati…
Bayesian solution to the inverse problem and its relation to Backus-Gilbert methods
Luigi Del Debbio, Alessandro Lupo, Marco Panero +1
The problem of obtaining spectral densities from lattice data has been receiving great attention due to its importance in our understanding of scattering processes in Quantum Field…
Absorbing discretisation effects with a massive renormalization scheme: the charm-quark mass
Luigi Del Debbio, Felix Erben, Jonathan M. Flynn +2
We present the first numerical implementation of the massive SMOM (mSMOM) renormalization scheme and use it to calculate the charm quark mass. Based on ensembles with three flavour…
Meson spectroscopy from spectral densities in lattice gauge theories
Ed Bennett, Luigi Del Debbio, Niccolò Forzano +10
Spectral densities encode non-perturbative information that enters the calculation of a plethora of physical observables in strongly coupled field theories. Phenomenological applic…
Charm quark mass using a massive nonperturbative renormalisation scheme
Luigi Del Debbio, Felix Erben, Jonathan Flynn +2
We present a first numerical implementation of a massive nonperturbative renormalisation scheme, RI/mSMOM, in the study of heavy quarks using the domain-wall fermion action. In par…
Bayesian interpretation of Backus-Gilbert methods
Luigi Del Debbio, Alessandro Lupo, Marco Panero +1
The extraction of spectral densities from Euclidean correlators evaluated on the lattice is an important problem, as these quantities encode physical information on scattering ampl…
Lattice studies of Sp(2N) gauge theories using GRID
Niccolò Forzano, Ed Bennett, Peter Boyle +9
Four-dimensional gauge theories based on symplectic Lie groups provide elegant realisations of the microscopic origin of several new physics models. Numerical studies pursued on th…
Symplectic lattice gauge theories on Grid: approaching the conformal window
Ed Bennett, Peter A. Boyle, Luigi Del Debbio +9
Symplectic gauge theories coupled to matter fields lead to symmetry enhancement phenomena that have potential applications in such diverse contexts as composite Higgs, top partial…
Inverse Problems in PDF Determinations
Alessandro Candido, Luigi Del Debbio, Tommaso Giani +1
The determination of Parton Distribution Functions from a finite set of data is a typical example of an inverse problem. Inverse problems are notoriously difficult to solve, in par…
Fits of finite-volume smeared spectral densities
Luigi Del Debbio, Alessandro Lupo, Marco Panero +1
Motivated by recent progress in the numerical inversion of the Laplace transform, we investigate applications of finite-volume smeared spectral densities. These include the tuning…
Multi-Representation Dynamics of SU(4) Composite Higgs Models: Chiral Limit and Spectral Reconstructions
Luigi Del Debbio, Alessandro Lupo, Marco Panero +1
We present a lattice study of the gauge theory with two Dirac fermions in the fundamental and two in the two-index antisymmetric representation, a model close to a theory o…
A lattice QCD perspective on weak decays of b and c quarks Snowmass 2022 White Paper
Peter A. Boyle, Bipasha Chakraborty, Christine T. H. Davies +32
Lattice quantum chromodynamics has proven to be an indispensable method to determine nonperturbative strong contributions to weak decay processes. In this white paper for the Snowm…
Spectral reconstruction in SU(4) gauge theory with fermions in multiple representations
Luigi Del Debbio, Alessandro Lupo, Marco Panero +1
The naturalness problem in the Higgs sector finds a popular solution in composite Higgs models. In such theories the Higgs boson emerges as the pseudo-Nambu-Goldstone boson associa…
BSM mixing on JLQCD and RBC/UKQCD DWF ensembles
Peter Boyle, Luigi Del Debbio, Felix Erben +6
We are presenting our ongoing Lattice QCD study on mixing on several RBC/UKQCD and JLQCD ensembles with 2+1 dynamical-flavour domain-wall fermions, including physical…
Efficient Modelling of Trivializing Maps for Lattice Theory Using Normalizing Flows: A First Look at Scalability
Luigi Del Debbio, Joe Marsh Rossney, Michael Wilson
General-purpose Markov Chain Monte Carlo sampling algorithms suffer from a dramatic reduction in efficiency as the system being studied is driven towards a critical point. Recently…
Nonperturbative infrared finiteness in super-renormalisable scalar quantum field theory
Guido Cossu, Luigi Del Debbio, Andreas Juttner +5
We present a study of the IR behaviour of a three-dimensional super-renormalisable quantum field theory (QFT) consisting of a scalar field in the adjoint of with a in…
Renormalization of the energy-momentum tensor in three-dimensional scalar theories using the Wilson flow
Luigi Del Debbio, Elizabeth Dobson, Andreas Jüttner +6
A nonperturbative determination of the energy-momentum tensor is essential for understanding the physics of strongly coupled systems. The ability of the Wilson flow to eliminate di…
Strong dynamics with matter in multiple representations: SU(4) gauge theory with fundamental and sextet fermions
Guido Cossu, Luigi Del Debbio, Marco Panero +1
We present a non-perturbative lattice study of SU(4) gauge theory with two flavors of fermions in the fundamental representation and two in the two-index antisymmetric representati…
Non perturbative physics from NSPT: renormalons, the gluon condensate and all that
Luigi Del Debbio, Francesco Di Renzo, Gianluca Filaci
Numerical Stochastic Perturbation Theory (NSPT) enables very high order computations in Lattice Gauge Theories. We report on the determination of the gluon condensate from lattice…
Heavy Domain Wall Fermions: The RBC and UKQCD charm physics program
P. A. Boyle, L. Del Debbio, A. Juttner +3
We review the domain wall charm physics program of the RBC and UKQCD collaborations based on simulations including ensembles with physical pion mass. We summarise our current set-u…
The decay constants and in the continuum limit of domain wall lattice QCD
Peter A. Boyle, Luigi Del Debbio, Andreas Juttner +3
We present results for the decay constants of the and mesons computed in lattice QCD with dynamical flavours. The simulations are based on RBC/UKQCD's domain wa…
A massive momentum-subtraction scheme
Peter Boyle, Luigi Del Debbio, Ava Khamseh
A new renormalization scheme is defined for fermion bilinears in QCD at non vanishing quark masses. This new scheme, denoted RI/mSMOM, preserves the benefits of the nonexceptional…