Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

C. Adolph (Universität Erlangen–Nürnberg, Physikalisches Institut, Erlangen, 91054, Germany) ; R. Akhunzyanov (Joint Institute for Nuclear Research, Moscow Region, Dubna, 141980, Russia) ; M.G. Alexeev (University of Turin, Department of Physics, Turin, 10125, Italy) ; G.D. Alexeev (Joint Institute for Nuclear Research, Moscow Region, Dubna, 141980, Russia) ; A. Amoroso (University of Turin, Department of Physics, Turin, 10125, Italy; Torino Section of INFN, Turin, 10125, Italy) ; et al. - Show all 207 authors

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.

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  "control_number": "5022", 
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    "updated": "2018-04-17T13:47:17Z", 
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      "title": "Odd and even partial waves of \u03b7\u03c0\u2212 and \u03b7\u2032\u03c0\u2212 in \u03c0\u2212p\u2192\u03b7(\u2032)\u03c0\u2212p at 191 GeV/c"
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      "value": "Exclusive production of \u03b7\u03c0\u2212 and \u03b7\u2032\u03c0\u2212 has been studied with a 191 GeV/c \u03c0\u2212 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 \u03b7\u2032\u03c0\u2212 over \u03b7\u03c0\u2212 is found for the L=1,3,5 waves, which carry non- qq\u00af quantum numbers. The L=1 intensity peaks at 1.7 GeV/c2 in \u03b7\u2032\u03c0\u2212 and at 1.4 GeV/c2 in \u03b7\u03c0\u2212 , the corresponding phase motions with respect to L=2 are different."
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Published on:
03 December 2014
Publisher:
Elsevier
Published in:
Physics Letters B (2015)

Pages 303-311
DOI:
https://doi.org/10.1016/j.physletb.2014.11.058
Copyrights:
The Authors
Licence:
CC-BY-3.0

Fulltext files: