Odd and even partial waves of ηπ−ηπ− and η′π−η′π− in π−p→η(′)π−pπ−p→η(′)π−p at 191 GeV/c
Exclusive production of ηπ− and ηπ− has been studied with a 191 GeV/c π− beam impingingon a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angularmomentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similaritybetween the tw...
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Published in | Physics letters. B Vol. 740 |
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Main Authors | , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier
01.01.2015
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Subjects | |
Online Access | Get full text |
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Summary: | Exclusive production of ηπ− and ηπ− has been studied with a 191 GeV/c π− beam impingingon a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angularmomentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similaritybetween the two systems is observed for the L = 2, 4, 6 intensities (scaled by kinematical factors) and therelative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast,a strong enhancement of ηπ− over ηπ− is found for the L = 1, 3, 5 waves, which carry non-q¯q quantumnumbers. The L = 1 intensity peaks at 1.7 GeV/c2 in ηπ− and at 1.4 GeV/c2 in ηπ−, the correspondingphase motions with respect to L =2 are different. |
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ISSN: | 0370-2693 |
DOI: | 10.1016/j.physletb.2014.11.058 |