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High Precision Lattice QCD

Project HPLQCD
Research Area Plasma & Particle Physics
Principal Investigator(s) Prof.Dr. Zoltán Fodor
  • Universität Wuppertal, Fachbereich C - Physik, Germany
  • Eötvös Loránd University, Institute for Physics, Budapest, Hungary
  • Centre de Physique Théorique, Marseille, France


With the advent of Petascale supercomputers, high precision Lattice QCD (LQCD) calculations finally have become possible, more than 30 years after Wilson’s seminal papers introducing the approach. This is a time of opportunity, where controlled and precise calculations for many observables are feasible for the first time. The key ingredient is reducing extrapolation ranges by simulating directly at the physical pion mass value for a number of different lattice spacings, which is, however, feasible only with our new improved simulation algorithms.
Since our pioneering calculation of the light hadron mass spectrum with fully controlled systematic errors (Science 322, 1224, Nov. 2008), we have reached the "physical point" (i.e. tuned the pion mass down to its physical value at 135 MeV) for two lattice spacings and have gathered moderate statistics at these points. Here, we propose to improve our statistics and to extend our set of gauge field ensembles by an additional ensemble with fine lattice spacing and physical pion masses. This additional data point will help us control chiral extrapolations at this lattice spacing or make these superfluous altogether, which, together with the increased statistics, will greatly improve the precision and the predictive power of our continuum extrapolated physics results.
Our main physics aim is to compute highly precise estimates of the u-, d- and s- quark masses. These fundamental parameters of Standard Model of Elementary Particle Physics are known only to very low accuracy, a situation that we hope to improve on dramatically with our simulation. Furthermore, we hope to compute precision estimates of hadron masses, weak matrix elements, hadron structure functions and other quantities of phenomenological importance.

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