Speaker
Description
We investigate the thermal modification of the exclusive decay K1+(1270)→π+π−K+ in a hot hadronic medium using an effective hadronic model with ρ- and K∗-pole contributions. As the temperature increases, the decreasing K1 mass strongly reduces the available three-body phase space, leading to clear distortions in the Dalitz distribution and invariant-mass spectra, as well as a strong suppression of the decay width. We also introduce normalized shape observables to quantify the thermal evolution of the πK and ππ spectra. Our results show that the dominant in-medium effect is kinematic phase-space reduction in the strange axial-vector channel, suggesting that the exclusive K1(1270) decay can serve as a qualitative probe of strange axial-vector dynamics near the pseudocritical region.