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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy III

HK 24.5: Talk

Tuesday, March 12, 2024, 17:00–17:15, HBR 62: EG 19

Partial-Wave Analysis of the K_S⁰K⁻ Final State at COMPASS* — •Julien Beckers for the COMPASS collaboration — Technical University of Munich

The COMPASS experiment is a multi-purpose two-stage spectrometer at the CERN SPS. One of its main goals is to probe the strong interaction at low energies by studying the excitation spectrum of light mesons. This is done by decomposing the data into partial-wave amplitudes with well-defined quantum numbers and searching for resonances in these amplitudes. One of the many final states produced at COMPASS is K_S⁰ K⁻, which is complementary to COMPASS’s flagship π⁻π⁻π⁺ final state in that the same states appear as intermediate resonances. However, in K_S⁰ K⁻, only selected resonances, the a_J states with even J, can appear at COMPASS’ high beam energies. This allows a very selective study of these states. Additionally, the final state, consisting of two strange mesons, enables us to probe the intrinsic ss content of the isovector states. Using the so-far largest dataset of K_S⁰ K⁻ events, we are able to search for new resonances and measure states with high precision. We will present the partial-wave analysis of the K_S⁰ K⁻ final state, which shows several clear resonance signals.

*Funded by the DFG under Germany’s Excellence Strategy - EXC2094 - 90783311 and BMBF Verbundforschung 05P21WOCC1 COMPASS.

Keywords: COMPASS; Partial-wave analysis; strong interaction