Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadronenstruktur und -spektroskopie
HK 38.6: Talk
Thursday, March 20, 2014, 15:30–15:45, HZ 3
Resonance extraction from diffractively produced π−π+π− final states at COMPASS — •Stephan Schmeing1 and COMPASS Kollaboration2 — 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 large amount of data allow to perform the partial-wave analysis in bins of the squared four-momentum transfer t′ from the beam to the target. Surprisingly, the data exhibit a pronounced dependence of the partial-wave contents on t′.
Using a novel analysis method this effect is exploited in order to better separate resonant from non-resonant contributions in the partial waves. This makes it possible to extract resonance parameters with higher precision, for example for the long-debated a1(1260). In addition the t’-dependence contains important information about the different contributing production processes. We will present the first results of this new method in the π−p → π−π+π−p channel.
Supported by BMBF, MLL and the Cluster of Excellence Exc153 “Origin and Structure of the Universe”