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H2020Individual fellowship2017–2019

XQCDBaryons · Baryons in extreme QCD matter

Horizon 2020 — Marie Skłodowska-Curie Actions

Duration
2017-10-01 → 2019-12-31
EU contribution
€171,461
Participants
1
Scheme
MSCA-IF-EF-ST

Lines connect the coordinator with its partners.

Results in brief

Baryons in extreme QCD matter

Quantum chromodynamic (QCD) is a part of the Standard Model of elementary particles and their interactions. It is this theory that governs the strong interactions between quarks and gluons. At very large momentum scales (or small distances), the QCD coupling parameter becomes small and perturbative expansion is applicable. QCD has been tested throughly in this regime. However, at somewhat larger distances the strong interactions bind quarks and gluons into hadrons, such as the pion and the proton. This is the region where numerical simulation of the underlying theory (lattice QCD) is required. Experimentally there was a lot of progress recently, discovering new resonances that contain a charm quark and a charm antiquark (charmonia). More recently, at the LHCb at CERN, new baryons containing two charm quarks and a light quark have been discovered as well as many baryons containing the even heavier bottom quark. The properties of these particles and resonances need to be derived from QCD, which then will also guide experimental searches. An understanding of the world of elementary particles and of our place in the world is important for society as a whole. The objectives of this project are mainly to develop calculational techniques that enable us to do so but also to achieve some predictions that can directly be compared to experiment.

Data: CORDIS, © European Union

Project objective

Quantum Chromodynamics (QCD) undergoes a crossover from the hadronic phase at low temperatures T to a quark-gluon plasma (QGP) phase at high T. This crossover and properties of the QGP phase are important for understanding the evolution of the early universe and are being studied by major Heavy Ion Collision (HIC) experiments at RHIC and LHC. The transition temperature and many QGP properties have been determined by Lattice QCD simulations. However, connecting these to experimental remnants of QGP fireballs produced at HICs is not straightforward. Thermal effects will modify the properties of the excitations (mesons and baryons) within the medium. We propose to investigate these in-medium changes using lattice QCD methods, shedding light onto the dynamics of HIC fireballs.Low temperature, high chemical potential phases are another region of the QCD phase diagram, interesting, e.g., for the physics of neutron stars. While this region is not accessible to numerical methods at present, we address the situation of an isospin chemical potential mu_I on the lattice, which also describes important aspects of neutron star cores. We propose to determine baryonic excitations for non-zero mu_I, which can provide a deeper understanding of possible quark matter cores in neutron stars.

Original text from CORDIS.

Participants

  • UNIVERSITAET REGENSBURG · RegensburgCoordinatorGermany

Links

Data: CORDIS, © European Union