Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Hadron Structure and Spectroscopy II

HK 9.2: Vortrag

Montag, 14. März 2016, 17:00–17:15, S1/01 A5

Central Production at COMPASS — •Alexander Austregesilo — Technische Universität München

COMPASS is a fixed-target experiment at the CERN SPS that studies the spectrum of light-quark hadrons. In 2009, it collected a unique dataset using a 190 GeV/c positive hadron beam impinging on a liquid-hydrogen target in order to measure the central exclusive production of light scalar mesons. One of the goals is the search for so-called glueballs, which are hypothetical meson-like objects without valence-quark content. We study the decay of neutral resonances by selecting centrally produced hadron pairs from the COMPASS dataset. The angular distributions of these two-pseudoscalar meson final states are decomposed in terms of partial waves, where particular attention is paid to the inherent mathematical ambiguities. The large dataset permits us to perform a detailed analysis in two-dimensional bins of the two squared four-momentum transfers carried by the exchange particles in the reaction. Possible parameterisations of the mass dependence of the partial-wave amplitudes in terms of resonances are also discussed.

Supported by BMBF, MLL and the Cluster of Excellence Exc153 “Origin and Structure of the Universe”