Odd and even partial waves of ηπ- and η'π- in π-p→η(')π-

COMPASS Collaboration

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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.

Original languageEnglish
Pages (from-to)303-311
Number of pages9
JournalPhysics Letters B
Volume740
DOIs
StatePublished - 6 Jan 2015

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