Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 63: Hadron Structure and Spectroscopy XI
HK 63.2: Vortrag
Donnerstag, 31. März 2022, 14:30–14:45, HK-H8
Study of Diffractively Produced KS0π−, KS0K−, and Λp Final States at COMPASS — •Julien Beckers — Physik-Department E18, Technische Universität München
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. However, before we can perform such a partial-wave analysis, we have to select the events that correspond to the processes of interest and separate them from background contributions with high purity.
We will present the analysis of three diffractive reactions: π− + p → KS0 K− + p, K− + p → KS0 π− + p, and K− + p → Λ p + p. They have in common that the produced final states contain long-lived neutral particles, that are identified in the spectrometer via their secondary decay vertices. The KS0 K− final state, allows us to study aJ- and πJ-like resonances with spin J and complements the π−η, π−η′ and π−π−π+ final states that have already been studied at COMPASS. The KS0π− and Λp final states allow us to study excited strange mesons over a wide mass range. We will present the event selection and discuss kinematic distributions, in which first resonance signals are observed. The high precision of our data will allow us to perform detailed searches for new resonances as well as improve parameters of known states.