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Jul 22 – 28, 2018
Kellogg Hotel and Conference Center
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The fate of axial U(1) and the topological susceptibility in QCD with two light quarks

Jul 24, 2018, 2:20 PM
Centennial (Kellogg Hotel and Conference Center)


Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Nonzero Temperature and Density Nonzero Temperature and Density


Mr Lukas Mazur (Bielefeld University)


The region of the Columbia plot with two light quark flavors is not yet conclusively understood. Non-perturbative effects, e.g. the magnitude of the anomalous U(1) axial symmetry breaking decides on the nature of the phase transition in this region. We report on our study of this region of the Columbia plot using lattice techniques. We use gauge ensembles generated within the Highly Improved Staggered Quark discretization scheme, with the strange quark mass fixed at its physical value and the light quark mass varied such that m_l=m_s/27, m_s/40, m_s/80, where m_l=m_s/27 corresponds to the physical light quark mass. We study the eigenvalue spectrum of QCD at finite temperature around the chiral transition temperature T_c, as the light quark masses approach towards the chiral limit and infer about the fate of anomalous U(1) symmetry. We also show how the topological susceptibility of QCD at finite temperature varies as one goes towards the chiral limit.

Primary author

Mr Lukas Mazur (Bielefeld University)


Prof. Edwin Laermann (Bielefeld University) Dr Olaf Kaczmarek (Bielefeld University) Dr Sayantan Sharma (The Institute of Mathematical Sciences)

Presentation materials