The spectrum of light isovector mesons with from the COMPASS experiment
Oct 4, 20169 pages
Published in:
- JPS Conf.Proc. 13 (2017) 010018
Contribution to:
- Published: 2017
e-Print:
- 1610.01231 [hep-ex]
Experiments:
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Abstract: (Physical Society of Japan)
Based on the largest event sample of diffractively produced π^−π^−π^+, obtained by a pion beam of 190 GeV/c momentum, the COMPASS collaboration has performed the so far most advanced partial-wave analysis on multi-body final states, using the isobar model. The large number of 88waves included in the analysis reduces truncation effects. We have used fourteen waves, to extract resonance parameters for eleven light-meson candidates, most of them observed previously. The coherence of the analysis and the large variety of systematic studies has allowed us to determine mass and width of most and π_J states with a total of six different values of J^PC below a mass of 2:1 GeV/c^2, with high confidence. We exploit that the production rates of resonant and non-resonant contributions in these fourteen waves vary differently with the four-momentum transfer squared in the reaction. In addition, we have performed the first isobar-freed analysis in diffraction, from which we have determined the shape of the ππ S-wave isobar for different J^PC of the 3π system.Note:
- 9 pages, 7 figures, Proceedings MENU2016 (Version 2)
- talk: Kyoto 2016/07/25
- pi: beam
- pi: multiple production
- meson: isovector
- diffraction: dissociation
- COMPASS
- CERN SPS
- partial wave analysis
- spin: parity
- momentum transfer dependence
References(16)
Figures(8)
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