## Dr. Patrick Fritzsch

#### Research Projects

Physics from the master-field

#### Representations

Details Date
Co-founder of the OpenLat initiative (https://openlat1.gitlab.io), overseeing the gauge field generation and leader of the flavour physics & Symanzik improvement working group.
As continuation from last year, I am still co-advising a BSc and MSc student at University of Muenster, Germany, in the group of Prof. J. Heitger.

#### Languages

Language Skill Reading Skill Writing Skill Speaking
English Fluent Fluent Fluent
German Fluent Fluent Fluent

#### Membership of Professional Institutions, Associations, Societies

Details Date From Date To
Member of the German Physical Society (DPG) October 1999
Co-founder and leading member of the Open Lattice Initiative, an association of lattice scientists in the EU & US to promote new developments, young researchers and open science. 2019

#### Publications

 Francis, Anthony, Patrick Fritzsch, Lüscher, Martin, Rago, Antonio, Master-field simulations of O($a$)-improved lattice QCD: Algorithms, stability and exactness, Comput.Phys.Commun., 2020, Journal Article, PUBLISHED Campos, Isabel, Patrick Fritzsch, Hansen, Martin, Marinkovic, Marina Krstic, Patella, Agostino, Ramos, Alberto, Tantalo, Nazario, openQ*D code: a versatile tool for QCD+QED simulations, Eur.Phys.J.C, 2020, Journal Article, PUBLISHED Mattia Bruno, Isabel Campos Plasencia, Patrick Fritzsch, Jonna Koponen, Carlos Pena, David Preti, Alberto Ramos, Anastassios Vladikas, Light quark masses in ${N_\mathrm{f}=2+1}$ lattice QCD with Wilson fermions, Eur.Phys.J.C, 2020, Journal Article, PUBLISHED Chimirri, Leonardo, Fritzsch, Patrick, Heitger, Jochen, Joswig, Fabian, Panero, Marco, Pena, Carlos, Preti, David, Non-perturbative renormalization of $O(a)$ improved tensor currents, PoS, 2020, Journal Article, PUBLISHED Fritzsch, P., Sommer, R., Stollenwerk, F., Wolff, U., Erratum to: Symanzik improvement with dynamical charm: a 3+1 scheme for Wilson quarks (Journal of High Energy Physics, (2018), 2018, 6, (25), 10.1007/JHEP06(2018)025), Journal of High Energy Physics, 2020, (10), 2020, Journal Article, PUBLISHED Giulia Maria de Divitiis, Patrick Fritzsch, Jochen Heitger, Carl Christian Köster, Simon Kuberski, Anastassios Vladikas, Non-perturbative determination of improvement coefficients $$b_\mathrm{m}$$ and $$b_\mathrm{A}-b_\mathrm{P}$$ and normalisation factor $$Z_\mathrm{m}Z_\mathrm{P}/Z_\mathrm{A}$$ with $$N_\mathrm{f}= 3$$ Wilson fermions, The European Physical Journal C, 79, (9), 2019, Journal Article, PUBLISHED Fritzsch, Patrick, Heitger, Jochen, Kuberski, Simon, $\mathcal{O}(a)$ improved quark mass renormalization for a non-perturbative matching of HQET to three-flavor QCD, PoS, 2018, Journal Article, PUBLISHED Patrick Fritzsch, Sommer, Rainer, Stollenwerk, Felix, Wolff, Ulli, Symanzik improvement with dynamical charm: a 3+1 scheme for Wilson quarks, JHEP, 2018, Journal Article, PUBLISHED Patrick Fritzsch, Mass-improvement of the vector current in three-flavor QCD, JHEP, 2018, Journal Article, PUBLISHED Campos, Isabel, Patrick Fritzsch, Pena, Carlos, Preti, David, Ramos, Alberto, Vladikas, Anastassios, Non-perturbative quark mass renormalisation and running in $N_f=3$ QCD, Eur.Phys.J.C, 2018, Journal Article, PUBLISHED

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#### Awards and Honours

Award Date
Postdoctoral Fellowship at CERN November 2016
Postdoctoral Fellowship in excellence grant SO(IFT) November 2014
Marie Curie Early Stage Researcher October 2008

#### Description Of Research Interests

The Standard Model (SM) of particle physics is a gauged quantum field theory containing the internal symmetries of the unitary product group SU(3)×SU(2)×U(1). The theory is commonly viewed as containing a fundamental set of particles - the leptons, quarks, gauge bosons and the Higgs boson. Within the SM, the SU(3)-color symmetry group is the building block for Quantum Chromodynamics (QCD), the theory of the strong interaction between quarks and gluons. These fundamental particles make up composite hadrons such as the proton, neutron and pion. The complicated nature of this interaction requires to formulate QCD on a space-time lattice in order to determine physical properties of hadrons measured in collider experiments around the world. In my research I employ such a lattice discretisation and high-performant supercomputers or clusters to determine how hadrons decay and interact with each other. Understanding their interaction with high accuracy informs ongoing searches for physics beyond the SM and sheds light on some important scientific questions of our times, e.g., about the baryon asymmetry of our universe or the origin of dark matter. The key tools of my research involve, e.g., programming and running large scale simulations, numerical analysis, flavour physics and effective field theories. I am working on reducing systematic effects in present day lattice QCD calculations with Wilson fermions to push their applicability to processes mainly addressed by other discretisation to date. Ultimately, I want to include electromagnetic (QED) and strong isospin-breaking effects, such that - just as in nature - u, d, s and c quarks are not identical and carry an electric charge. Most recently, I have been working on a better discretisation and establishing the master-field approach as a new way to determine hadron properties.