Massive {Y}ang-{M}ills for vector and axial-vector spectral functions at finite temperature
| Pub type: | Article |
| Citation: | Hohler201670 |
| Status: | Published |
| Journal: | Annals of Physics |
| Volume: | 368 |
| Year: | 2016 |
| Month: | May |
| Pages: | 70 - 109 |
| ISSN: | 0003-4916 |
| URL: | http://www.sciencedirect.com/s... |
| DOI: | 10.1016/j.aop.2016.01.018 |
| Abstract: | Abstract The hadronic mechanism which leads to chiral symmetry restoration is explored in the context of the ρ π a 1 system using Massive Yang–Mills, a hadronic effective theory which governs their microscopic interactions. In this approach, vector and axial-vector mesons are implemented as gauge bosons of a local chiral gauge group. We have previously shown that this model can describe the experimentally measured vector and axial-vector spectral functions in vacuum. Here, we carry the analysis to finite temperatures by evaluating medium effects in a pion gas and calculating thermal spectral functions. We find that the spectral peaks in both channels broaden along with a noticeable downward mass shift in the a 1 spectral peak and negligible movement of the ρ peak. The approach toward spectral function degeneracy is accompanied by a reduction of chiral order parameters, i.e., the pion decay constant and scalar condensate. Our findings suggest a mechanism where the chiral mass splitting induced in vacuum is burned off. We explore this mechanism and identify future investigations which can further test it. |
| Month_val: | 5 |
| Sig contrib: | R. Rapp |
| Keywords: | Chiral symmetry restoration, Finite temperature, Hadronic effective field theory, Massive Yang-Mills, Spectral functions |
| Authors: | |
| Added by: | [VT] |
| Total mark: | 0 |
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