Is $\rho$-meson melting compatible with chiral restoration?
| Pub type: | Article |
| Citation: | Hohler2014103 |
| Status: | Published |
| Journal: | Physics Letters B |
| Volume: | 731 |
| Year: | 2014 |
| Month: | April |
| Pages: | 103 - 109 |
| ISSN: | 0370-2693 |
| URL: | http://www.sciencedirect.com/s... |
| DOI: | 10.1016/j.physletb.2014.02.021 |
| Abstract: | Abstract Utilizing in-medium vector spectral functions which describe dilepton data in ultra-relativistic heavy-ion collisions, we conduct a comprehensive evaluation of \{QCD\} and Weinberg sum rules at finite temperature. The starting point is our recent study in vacuum, where the sum rules have been quantitatively satisfied using phenomenological vector and axial-vector spectral functions which describe hadronic τ-decay data. In the medium, the temperature dependence of condensates and chiral order parameters is taken from thermal lattice \{QCD\} where available, and otherwise is estimated from a hadron resonance gas. Since little is known about the in-medium axial-vector spectral function, we model it with a Breit–Wigner ansatz allowing for smooth temperature variations of its width and mass parameters. Our study thus amounts to testing the compatibility of the ρ-broadening found in dilepton experiments with (the approach toward) chiral restoration, and thereby searching for viable in-medium axial-vector spectral functions. |
| Month_val: | 4 |
| Sig contrib: | R. Rapp |
| Authors: | |
| Added by: | [DGM] |
| Total mark: | 0 |
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