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on behalf of the COMPASS collaboration

Stephan Paul
James Franck Str

Publication date

January 2013

Abstract

We report on the results of a novel partial-wave analysis based on 50 · 106 events from the reaction pi − + p → pi−pi−pi+ + precoil at 190 GeV/c incoming beam momentum using the COMPASS spectrometer. A separated analysis in bins of m3pi and four-momentum transfer t′ reveals the interference of resonant and non-resonant particle production and allows their spectral separation. Besides well known resonances we observe a new iso-vector meson a1(1420) at a mass of 1420 MeV/c2 in the f0(980)pi final state only, the origin of which is unclear. We have also examined the structure of the 0++ pipi-isobar in the JPC = 0−+, 1++, 2−+ three pion waves. This clearly reveals the various 0++ pipi-isobar components and its correlation to the decay of light ...

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