Odd and even partial waves of $\eta\pi^-$ and $\eta'\pi^-$ in $\pi^-p\to\eta^{(\prime)}\pi^-p$ at $191\,\textrm{GeV}/c$

Adolph, C.; Akhunzyanov, R.; Alexeev, M.G.; Alexeev, G.D.; Amoroso, A.; Andrieux, V.; Anosov, V.; Austregesilo, A.; Badelek, B.; Balestra, F.

doi:10.1016/j.physletb.2014.11.058

Odd and even partial waves of $\eta\pi^-$ and $\eta'\pi^-$ in $\pi^-p\to\eta^{(\prime)}\pi^-p$ at $191\,\textrm{GeV}/c$

COMPASS

Collaboration

•

C. Adolph
(
- Erlangen - Nuremberg U.
)

Aug 19, 2014

9 pages

Published in:

Phys.Lett.B 740 (2015) 303-311,
Phys.Lett.B 811 (2020) 135913 (erratum)

Published: Nov 30, 2014

e-Print:

1408.4286 [hep-ex]

DOI:

10.1016/j.physletb.2014.11.058,
10.1016/j.physletb.2020.135913 (erratum)

PDG:

{{\mathit a}_{{{2}}}{(1320)}}

\rightarrow

{{\mathit \eta}}{{\mathit \pi}}

Report number:

CERN-PH-EP-2014-204

Experiments:

CERN-SPS-NA58

View in:

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Abstract: (Elsevier)

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.

Note:

16 pages, 5 figures and 1 table

pi- p: inelastic scattering
eta(958): electroproduction
partial wave analysis
eta: exclusive production
angular momentum
CERN SPS
COMPASS
experimental results
mass spectrum: (eta(958) pi-)
mass spectrum: (eta pi-)

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