Bochum 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadron Structure and Spectroscopy I

HK 1.1: Gruppenbericht

Montag, 26. Februar 2018, 14:00–14:30, HZO 50

Hadron Spectroscopy with COMPASS — •Boris Grube for the COMPASS collaboration — 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. One of the main goals of the experiment is the study of the light-meson spectrum. In diffractive reactions, a rich spectrum of isovector mesons is produced using a 190 GeV/c negative pion beam. The resonances decay typically into multi-body final states and are extracted from the data using partial-wave analysis techniques. We have performed the so far most comprehensive analysis of this kind on the π⁻π⁻π⁺ final state, for which COMPASS has acquired a large data set of 46 million event. In a novel approach, we take into account the dependence of the production process on the squared four-momentum transfer t from the beam to the target. As a consequence, we were able to better separate resonant and non-resonant contributions and to extract for the first time the dependence of the resonant and non-resonant amplitudes on t. We will discuss results from this analysis.

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.