期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 12, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP12(2016)158
关键词
Global Symmetries; Lattice QCD; Phase Diagram of QCD; Spontaneous Symmetry Breaking
资金
- John von Neumann Institute for Computing (NIC) [HMZ21]
- Center for Computational Sciences in Mainz as part of the Rhineland-Palatine Research Initiative
- DFG [ME 3622/2-1, SFB/TRR 55]
- Emmy Noether Programme [EN 1064/2-1]
We study the thermal transition of QCD with two degenerate light flavours by lattice simulations using O(a)-improved Wilson quarks. Temperature scans are performed at a fixed value of N (t) = (aT)(-1) = 16, where a is the lattice spacing and T the temperature, at three fixed zero-temperature pion masses between 200 MeV and 540 MeV. In this range we find that the transition is consistent with a broad crossover. As a probe of the restoration of chiral symmetry, we study the static screening spectrum. We observe a degeneracy between the transverse isovector vector and axial-vector channels starting from the transition temperature. Particularly striking is the strong reduction of the splitting between isovector scalar and pseudoscalar screening masses around the chiral phase transition by at least a factor of three compared to its value at zero temperature. In fact, the splitting is consistent with zero within our uncertainties. This disfavours a chiral phase transition in the O(4) universality class.
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