https://doi.org/10.1140/epjc/s10052-020-7617-3
Special Article - Tools for Experiment and Theory
openQ*D code: a versatile tool for QCD+QED simulations
collaboration
1
Instituto de Física de Cantabria and IFCA-CSIC, Avda. de Los Castros s/n, 39005, Santander, Spain
2
Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
3
INFN, Sezione di Tor Vergata, Via della Ricerca Scientifica 1, 00133, Rome, Italy
4
School of Mathematics, Trinity College Dublin, Dublin 2, Ireland
5
Institut für Physik and IRIS Adlershof, Humboldt Universität zu Berlin, Zum Grossen Windkanal 6, 12489, Berlin, Germany
6
Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133, Rome, Italy
* e-mail: fritzsch@uni-muenster.de
Received:
12
September
2019
Accepted:
6
January
2020
Published online:
3
March
2020
We present the open-source package openQ*
D-1.0 (openQ*D. GitLab: https://gitlab.com/rcstar/openQxD. CSIC: https://dx.doi.org/10.20350/digitalCSIC/8591. https://hdl.handle.net/10261/173334, 2019), which has been primarily, but not uniquely, designed to perform lattice simulations of QCD+QED and QCD, with and without 
boundary conditions, and O(a) improved Wilson fermions. The use of boundary conditions in the spatial direction allows for a local and gauge-invariant formulation of QCD+QED in finite volume, and provides a theoretically clean setup to calculate isospin-breaking and radiative corrections to hadronic observables from first principles. The openQ*D code is based on openQCD-1.6 (Simulation program for lattice QCD (openQCD code). https://cern.ch/luscher/openQCD, 2016) and NSPT-1.4 (Numerical Stochastic Perturbation Theory (NSPT code). https://cern.ch/luscher/NSPT, 2017). In particular it inherits from openQCD-1.6 several core features, e.g. the highly optimized Dirac operator, the locally deflated solver, the frequency splitting for the RHMC, or the 4th order OMF integrator.
© The Author(s), 2020
