{
  "id": "1712.00074",
  "version": "v1",
  "published": "2017-11-30T20:51:43.000Z",
  "updated": "2017-11-30T20:51:43.000Z",
  "title": "Recent advances on chiral partners and patterns",
  "authors": [
    "Angel Gómez Nicola",
    "Jacobo Ruiz de Elvira",
    "Silvia Ferreres-Solé",
    "Andrea Vioque-Rodríguez"
  ],
  "comment": "6 pages, 3 figures. Proceedings of Hadron 2017 conference, 25-29 september 2017, Salamanca (Spain)",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We review recent results on chiral $SU(2)_L\\times SU(2)_R\\approx O(4)$ and $U(1)_A$ symmetry restoration in QCD. In particular, we discuss how Ward Identities allow one to derive general results on partner degeneration, which shed light on the distinction between the $O(4)$ and $O(4)\\times U(1)_A$ patterns of the chiral transition. For that purpose, susceptibilities associated with the $O(4)$ and $U(1)_A$ symmetries are studied. From this analysis we conclude that in the ideal regime of exact $O(4)$ restoration (formally achieved in the limit of two massless flavours), $U(1)_A$ partners degenerate as well. We also discuss the role of the thermal $f_0(500)$ state to describe thermodynamic observables sensitive to chiral restoration, such as the scalar susceptibility. We pay special attention to the consistency of our results with recent lattice analysis.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-11-30T20:51:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "chiral partners",
      "pay special attention",
      "lattice analysis",
      "scalar susceptibility",
      "derive general results"
    ],
    "tags": [
      "conference paper"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}