Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Hadron Structure and Spectroscopy V
HK 32.2: Vortrag
Mittwoch, 16. März 2016, 14:30–14:45, S1/01 A4
Extraction of resonance parameters of light mesons in diffractively produced π−π+π− final states at COMPASS — •Stefan Wallner1 and Compass Collaboration2 — 1TU München E18 — 2Cern
The COMPASS experiment studies the spectrum of hadrons and has acquired a large data sample of diffractively produced π−π+π− final states using a 190 GeV pion beam on a hydrogen target. The size of the data set permits us to perform a partial-wave analysis in bins of the squared four-momentum transfer t′ from the beam to the target with the largest wave set used so far consisting of 88 waves.
Based on this partial-wave decomposition, resonance parameters are extracted by disentangling resonant and non-resonant parts of selected partial-wave amplitudes in resonance-model fits. The additional information obtained from the division of the data into bins of t′, allows for a better separation of resonant and non-resonant parts, as they exhibit different t′ dependences. Using this approach, the masses and widths of πJ- and aJ-like meson resonances have been extracted by simultaneously fitting a subset of selected partial waves. We will present this powerful analysis scheme and a selection of results.