Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Hadron Structure and Spectroscopy IV

HK 14.4: Vortrag

Dienstag, 31. März 2020, 18:00–18:15, J-HS M

Strange-Meson Spectroscopy at COMPASS — •Stefan Wallner — Physik-Department E18, Technische Universität München

COMPASS is a multi-purpose fixed-target experiment at CERN aimed at studying the structure and spectrum of hadrons. The two-stage spectrometer has a large acceptance over a wide kinematic range. Thus, it can be used to investigate a wide range of reactions. Diffractive production of mesons is studied with a negative hadron beam with a momentum of 190 GeV/c. So far, COMPASS has studied mainly isovector resonances of the aJ and πJ families with high precision, using the dominating π component of the beam.

Using the smaller K component of the beam allows us to investigate also the spectrum of strange mesons in various final states. The flagship channel is the Kππ+ final state, which in principle gives access to nearly all kaon states, i.e. KJ and KJ* families. COMPASS has acquired the so far worlds largest data set of about 720 000 exclusive events for this channel. In order to disentangle the produced mesons by their spin-parity quantum numbers, we employ the method of partial-wave analysis. The size of our dataset enables us to perform the analysis in four bins of the squared four-momentum transfer t′. Thus, the t′ dependence of the various signals in the data can be studied.

This work was supported by the BMBF, the DFG Cluster of Excellence *Origin and Structure of the Universe* (Exc 153), and the Maier-Leibnitz-Laboratorium der Universität und der Technischen Universität München.

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