QCD axion and topological susceptibility in chiral effective Lagrangian models at finite temperature
| Autor: | Enrico Meggiolaro, Salvatore Bottaro |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Quark
Physics Quantum chromodynamics High Energy Physics - Theory Meson 010308 nuclear & particles physics High Energy Physics::Lattice Scalar (mathematics) High Energy Physics::Phenomenology High Energy Physics - Lattice (hep-lat) FOS: Physical sciences Chiral phase Topology 01 natural sciences Computer Science::Digital Libraries Pseudoscalar High Energy Physics - Phenomenology High Energy Physics - Lattice High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th) 0103 physical sciences Effective lagrangian High Energy Physics::Experiment 010306 general physics Axion |
| Zdroj: | Physical Review |
| Popis: | In this work we compute the axion mass and, from this (exploiting a well-known relation), we also derive an expression for the QCD topological susceptibility in the finite-temperature case, both below and above the chiral phase transition at $T_c$, making use of a chiral effective Lagrangian model which includes the axion, the scalar and pseudoscalar mesons and implements the $U(1)$ axial anomaly of the fundamental theory. We also provide a numerical estimate of the topological susceptibility at $T=0$ (in the physical case of three light quark flavors) and discuss the question of the temperature and quark-mass dependence of the topological susceptibility in the high-temperature regime. Comment: 26 pages, revised version, published in Phys. Rev. D |
| Databáze: | OpenAIRE |
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