Observation of a structure in the $M_{p\eta }$ invariant mass distribution near 1700 ${MeV}/ {c}^2$ in the $\gamma \mathbf {p \rightarrow p \pi ^0 \eta } $ reaction - INSPIRE

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Observation of a structure in the $M_{p\eta }$ invariant mass distribution near 1700 ${MeV}/ {c}^2$ in the $\gamma \mathbf {p \rightarrow p \pi ^0 \eta }$ reaction

CBELSA/TAPS

Collaboration

•

V. Metag
(
- Giessen U.
)

Oct 11, 2021

16 pages

Published in:

Eur.Phys.J.A 57 (2021) 12, 325

Published: Dec 9, 2021

e-Print:

2110.05155 [nucl-ex]

DOI:

10.1140/epja/s10050-021-00634-1

Experiments:

BONN-ELSA-CRYSTAL-BARREL

View in:

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Citations per year

Abstract: (Springer)

The reaction

\gamma p \rightarrow p \pi ^0 \eta

has been studied with the CBELSA/TAPS detector at the electron stretcher accelerator ELSA in Bonn for incident photon energies from threshold up to 3.1 GeV. This paper has been motivated by the recently claimed observation of a narrow structure in the

M_{N\eta }

invariant mass distribution at a mass of

1678\,\hbox {MeV}/\hbox {c}^2

. The existence of this structure cannot be confirmed in the present work. Instead, for

E_{\gamma }

= 1400–1500 MeV and the cut

M_{p\pi ^0} \le 1190 \,\hbox {MeV}/\hbox {c}^2

a statistically significant structure in the

M_{p\eta }

invariant mass distribution near 1700

\hbox {MeV}/\hbox {c}^2

is observed with a width of

\varGamma \approx 35\hbox {MeV}/\hbox {c}^2

while the mass resolution is

\sigma _{res}

= 5

\hbox {MeV}/\hbox {c}^2

. Increasing the incident photon energy from 1420 to 1540 MeV this structure shifts in mass from

\approx

1700

\hbox {MeV}/\hbox {c}^2

to

\approx

1725

\hbox {MeV}/\hbox {c}^2

; the width increases to about 50

\hbox {MeV}/\hbox {c}^2

and decreases thereafter. The cross section associated with this structure reaches a maximum of

\approx

100 nb around

E_{\gamma } \approx

1490 MeV (W

\approx

1920 MeV), which coincides with the

p a_0

threshold. Three scenarios are discussed which might be the origin of this structure in the

M_{p\eta }

invariant mass distribution. The most likely interpretation is that it is due to a triangular singularity in the

\gamma p \rightarrow p a_0 \rightarrow p \pi ^0 \eta

reaction.

Note:

16 pages, 18 figure

photon: energy
meson: photoproduction
photon p: exclusive reaction
mass spectrum: measured
mass resolution
triangulation
pulse stretcher
nucleon resonance: decay
Bonn ELSA Stor
photon: beam

References(61)

Figures(17)

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