QCD Sum Rule for Open Strange Meson $K_1^\pm$ in Nuclear Matter

TL;DR

This paper uses QCD sum rules to estimate how the properties of the open strange meson $K_1^$ change in nuclear matter, revealing significant mass shifts and potential experimental probes at J-PARC to study chiral symmetry restoration.

Contribution

It provides the first estimation of in-medium mass and width modifications of $K_1^$ using QCD sum rules, linking spectral changes to chiral symmetry restoration.

Findings

Mass shift of $K_1^-$ up to -249 MeV

Mass shift of $K_1^+$ up to -35 MeV

Spectral modifications detectable at J-PARC

Abstract

The properties of open strange meson $K_1^\pm$ in nuclear matter are estimated in the QCD sum rule approach. We obtain a relation between the in-medium mass and width of $K_1^-$ ($K_1^+$) in nuclear matter, and show that the upper limit of the mass shift is as large as -249 (-35) MeV. The spectral modification of the $K_1$ meson is possible to be probed by using kaon beams at J-PARC. Such measurement together with that of $K^*$ will shed light on how chiral symmetry is partially restored in nuclear matter.