Evaluating chiral symmetry restoration through the use of sum rules
| Pub type: | Inproceedings |
| Citation: | hohler2012evaluating |
| Status: | Published |
| Journal: | EPJ Web of Conferences |
| Booktitle: | Resonance Workshop at UT Austin |
| Volume: | 36 |
| Year: | 2012 |
| Month: | November |
| Pages: | 00012 |
| Location: | Austin, TX |
| Note: | March 5-7, 2012 |
| ISBN: | 978-2-7598-0834-2 |
| URL: | http://www.epj-conferences.org... |
| DOI: | 10.1051/epjconf/20123600012 |
| Abstract: | We pursue the idea of assessing chiral restoration via in-medium modifications of hadronic spectral functions of chiral partners. The usefulness of sum rules in this endeavor is illustrated, focusing on the vector/axial-vector channel. We first present an update on obtaining quantitative results for pertinent vacuum spectral functions. These serve as a basis upon which the in-medium spectral functions can be constructed. A novel feature of our analysis of the vacuum spectral functions is the need to include excited resonances, dictated by satisfying the Weinberg-type sum rules. This includes excited states in both the vector and axial-vector channels.We also analyze the QCD sum rule for the finite temperature vector spectral function, based on a ρ spectral function tested in dilepton data which develops a shoulder at low energies.We find that the ρ′ peak flattens off which may be a sign of chiral restoration, though a study of the finite temperature axial-vector spectral function remains to be carried out. |
| Month_val: | 11 |
| Sig contrib: | R. Rapp |
| Authors: | |
| Added by: | [DGM] |
| Total mark: | 0 |
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