München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Hadron Structure and Spectroscopy VI

HK 40.7: Vortrag

Mittwoch, 20. März 2019, 18:15–18:30, HS 13

Insights into the spin-exotic π₁(1600) meson — •Fabian Krinner for the COMPASS collaboration — Technische Universität München - Physik Department - E18

The COMPASS experiment is a two-stage multi-purpose spectrometer. One of its main goals is the study of the light-meson spectrum. The flagship channel is the diffractive process π⁻p→π⁻ π⁺π⁻p, for which COMPASS has collected a large data sample of 46×10⁶ events.

One focus of our analysis lies on mesons that have spin-exotic quantum numbers forbidden for qq states. The controversial π₁(1600) with J^PC=1⁻⁺ quantum numbers is a prominent example. To search for this state, a detailed partial-wave analysis (PWA) was performed on the collected data employing a novel method, called freed-isobar PWA. This method not only reduces potential model bias of the PWA and but also allows us to study the dynamic amplitudes of the 2π subsystems with well-defined J^PC quantum numbers in the 3π final state. Using the freed-isobar PWA, we have studied the J^PC=1⁻⁺ wave with unprecedented level of detail and dimensionality.

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 Universtiät und der Technischen Universität München.