https://doi.org/10.1051/epjconf/202429607008
Fate of the ρ – a1 mixing in dilepton production
1 Physics Program, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
2 Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan
3 Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602, Japan
4 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
5 International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
6 Institute of Theoretical Physics, University of Wroclaw, plac Maksa Borna 9, PL-50204 Wroclaw, Poland
* e-mail: azumi-sakai@hiroshima-u.ac.jp
** e-mail: harada@hken.phys.nagoya-u.ac.jp
*** e-mail: nchiho@hiroshima-u.ac.jp
**** e-mail: chihiro.sasaki@uwr.edu.pl
† e-mail: shigaki@hiroshima-u.ac.jp
‡ e-mail: syano@hiroshima-u.ac.jp
Published online: 26 June 2024
We investigate the effect of chiral mixing on dilepton production by combining the in-medium spectral function in the chiral effective field theory with the state-of-the-art fluid dynamical simulations. We compare the spectral functions with different chiral symmetry restoration scenarios: without chiral symmetry restoration, with chiral symmetry restoration, and the lowtemperature mixing theory extrapolated to high-temperature. We find that the scenario with proper chiral symmetry restoration that takes into account the degenerate ρ and a1 mesons leads to an increase of the yield in the window of 1.1 < M < 1.4 GeV. Whereas, the extrapolated low-temperature theorem leads to a substantial overestimate at M = 1.2 GeV.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
