Speaker
Description
The excitation spectrum of light mesons; which are composed of up, down, and strange quarks; allows us to study QCD at low energies. While the non-strange light-meson spectrum is already mapped out rather well, many predicted strange mesons have not yet been observed experimentally and many potentially observed states still need further confirmation. Hence, the strange-meson spectrum still holds many surprises that need to be discovered.
The COMPASS experiment at CERN has studied so far mainly non-strange mesons of the $a_J$ and $\pi_J$ families with high precision, using the dominating $\pi^-$ component of the beam. Using the smaller $K^-$ component allows us to investigate also the spectrum of strange mesons. The flagship channel is the $K^-\pi^-\pi^+$ final state, for which COMPASS has acquired the so-far world's largest data set. Based on this data set, we performed a partial-wave analysis in order to disentangle the produced mesons by their spin-parity quantum numbers.
In this talk, we will focus on recent results from this analysis of COMPASS data.
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