Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 77: Hadronenstruktur und -spektroskopie

HK 77.3: Vortrag

Donnerstag, 7. März 2013, 17:30–17:45, HSZ-304

Towards spectroscopy of final states with neutral particles at COMPASS — •Sebastian Uhl — Technische Universität München, Physik Department E18, 85748 Garching

COMPASS aims to study the structure and the spectrum of hadrons. The fixed-target spectrometer is located at CERN’s Super Proton Synchrotron. Equipped with precise tracking detectors and two electromagnetic calorimeters, it features a wide angular acceptance, and high resolution for charged and neutral particles. In 2008 and 2009 several billion events of a π⁻ beam impinging on a liquid hydrogen target have been recorded. These data can be used to study the light-quark meson spectrum in diffractive production.

The reconstruction of photons has recently been improved, allowing a new insight into final states containing neutral particles. Events with a single charged particle and four photons in the final state are studied for the occurrence of either two π⁰ or two η mesons. The prospects of a partial-wave analysis of these data will be discussed. In case the final state is π⁻π⁰π⁰, a comparison to the π⁻π⁺π⁻ final state should allow an important consistency check, and provide a handle on systematic effects.

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.