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

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