Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Hadron Structure and Spectroscopy V

HK 32.1: Gruppenbericht

Mittwoch, 16. März 2016, 14:00–14:30, S1/01 A4

Hadron Spectroscopy with COMPASS — •Boris Grube — 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. Their spectrum is investigated in various final states produced in diffractive dissociation or in central-production reactions. The COMPASS data not only allow for measuring the properties of known resonances with high precision, but also for searching for new states. Among these is a new resonance-like signal, the a₁(1420), with unusual properties. In addition, the resonance content of the partial wave with spin-exotic J^PC = 1⁻⁺ quantum numbers, which are forbidden for quark-antiquark states, is of particular interest.

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.