A New Way to Compute the Pseudoscalar Screening Mass at Finite Chemical Potential
Abstract
We present a method to calculate the pion screening mass in 2+1flavor lattice QCD to $\mathcal{O}(\mu^2_\ell)$, where $\mu_\ell$ is the isoscalar chemical potential. Our approach is based on the expression for the free theory pion screening correlator for massless quarks. We use the Taylor expansion method to calculate the screening correlator to $\mathcal{O}(\mu^4_\ell)$. We then extract the $\mathcal{O}(\mu^2_\ell)$ Taylor coefficient of the screening mass from the Taylor coefficients of the correlator, for two temperatures in the range 2  3 GeV. Our calculations were done using the Highly Improved Staggered Quark action, and the strange and light quark masses were set respectively to their physical and nearly physical values, corresponding to meson masses $M_{\bar{s}s}=686$ MeV and $M_\pi=160$ MeV.
 Publication:

arXiv eprints
 Pub Date:
 January 2024
 DOI:
 10.48550/arXiv.2401.03404
 arXiv:
 arXiv:2401.03404
 Bibcode:
 2024arXiv240103404H
 Keywords:

 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology
 EPrint:
 Contribution to the proceedings of The 40th International Symposium on Lattice Field Theory (Lattice 2023), July 31st  August 4th, 2023, Fermi National Accelerator Laboratory, USA