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Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadron Structure and Spectroscopy I

HK 1.1: Gruppenbericht

Montag, 27. März 2017, 16:45–17:15, F 5

Hadron Spectroscopy with COMPASS — •Stefan Wallner — Physik-Department E18, Technische Universität München

COMPASS is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron aimed at studying the structure and spectrum of hadrons. The two-stage spectrometer has a good acceptance for charged as well as neutral particles over a wide kinematic range and is thus able to measure a wide range of reactions. Light mesons are studied with negative (mostly π) and positive (p, π+) hadron beams with a momentum of 190 GeV/c. COMPASS has measured the so far world’s largest dataset of the diffractively produced ππ+π final state. We will report on new results for this final state, which allows to investigate aJ and πJ like light mesons including mesons with spin-exotic JPC = 1−+ quantum numbers, which are forbidden for quark-antiquark states. We employ the method of partial-wave analysis (PWA) to extract these states from the data. In this method, the decay into ππ+π is modeled as subsequent two-body decays and a fixed mass shape for the appearing ππ+ resonances is assumed. However, the large size of our dataset also allows us to extract these shapes directly from data. Finally, the resonance parameters of aJ and πJ like mesons are measured by disentangling resonant and non-resonant parts of selected partial waves in resonance-model fits.

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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