Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadronenstruktur und -spektroskopie

HK 38.6: Vortrag

Donnerstag, 20. März 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”