Speaker
Description
The mass shifts of chiral partners provide crucial insights into the role of a spontaneous chiral symmetry breaking in hadron mass generation. The $K^*$ and $K_1$ mesons, with their vacuum widths under 100 MeV, are particularly well-suited for precise mass shift measurements. However, the distinct momentum dependence of the longitudinal and transverse modes can blur the peak positions. In this talk, we examine the angular dependence of the two-body decays of $K^*$ and $K_1$ mesons. Our findings reveal that the longitudinal and transverse modes of the $K^*$ can be effectively isolated by observing the pseudoscalar decay along the forward and perpendicular directions, respectively. The same goal for $K_1$ meson can be achieved by an additional measurement of a produced vector meson’s polarization.
