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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Hadron Structure and Spectroscopy 4

HK 19.1: Group Report

Monday, March 23, 2015, 17:00–17:30, T/SR25

Precision Hadron Spectroscopy at COMPASS — •Alexander Austregesilo — Physik-Department E18, Techische Universität München

COMPASS is a fixed-target experiment at the CERN SPS, investigating the structure and the dynamics of hadrons. The experimental setup features a modern spectrometer with acceptance over a wide kinematic range and precise momentum resolution for charged-track reconstruction. Furthermore, particle identification and calorimetry make it an ideal tool to access a broad range of final states. In 2008 and 2009, a world leading data set was recorded with 190 GeV/c hadron beams impinging on a liquid hydrogen target.

Precision studies of the light-quark meson spectrum are pursued by the means of partial-wave analysis. As additional input, the dependence of the partial waves on the squared four-momentum transfer t is used to differentiate between resonant and non-resonant contributions. Furthermore, a novel method to extract information about the π⁺π⁻ subsystem in multi-pion final states was developed. We will present selected results on exotic mesons and glueball candidates formed in diffractive dissociation and central production reactions.

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