Conference Presentation (Other)

FZJ-2014-06718

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png From quarks to hadrons and back: spectral and bulk properties of strongly interacting matter from Lattice QCD

Krieg, S. (Corresponding Author)FZJ*

2014

Abstract: Computing, from first principles, the hadron masses to percent accuracy [Science 322, 1224], is only possible through simulations of Lattice Quantum Chromodynamics (QCD). With the advent of the present class of Pflop Machines and novel simulation algorithms, we now can proceed to compute per-mille effects in the particle spectrum, i.e. the proton-neutron mass difference. This difference is due to a subtle cancellation of already small effects (due to the mass difference of the up- and down-quarks and the presence of electromagnetic interactions). I will report on a Project [Phys.Rev.Lett. 111, 252001 and arXiv:1406.4088] to compute this and other mass differences using simulations of Lattice QCD and Quantum Electrodynamics and discuss the new simulations methods and highly efficient code employed. In the case of the proton and the neutron, quarks and gluons are confined to the hadron. If we, however, increase the temperature of the system sufficiently, both particles will 'melt' and quarks and gluons behave as free particles ('quark-gluon-plasma'). This transition is described by the Equation of State (EoS) of QCD [JHEP 1011,077]. I will discuss an ongoing project (e.g. [Nucl.Phys. A904-905, 869c]) aimed at calculating the EoS including the effects of a dynamical charm quark, which is relevant for temperatures larger than 300-400 MeV.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 411 - Computational Science and Mathematical Methods (POF2-411) (POF2-411)

Appears in the scientific report 2014

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