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Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c
- Source :
- Physics Letters B, Vol 740, Iss , Pp 303-311 (2015)
- Publication Year :
- 2015
- Publisher :
- Elsevier, 2015.
-
Abstract
- Exclusive production of ηπ− and η′π− has been studied with a 191 GeV/c π− beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similarity between the two systems is observed for the L=2,4,6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast, a strong enhancement of η′π− over ηπ− is found for the L=1,3,5 waves, which carry non-qq¯ quantum numbers. The L=1 intensity peaks at 1.7 GeV/c2 in η′π− and at 1.4 GeV/c2 in ηπ−, the corresponding phase motions with respect to L=2 are different.
Details
- Language :
- English
- ISSN :
- 03702693
- Volume :
- 740
- Issue :
- 303-311
- Database :
- Directory of Open Access Journals
- Journal :
- Physics Letters B
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.4b1c4490502f4c3791ab361a50ff890e
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.physletb.2014.11.058