The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on $\gamma p \rightarrow \pi N$ multipoles - INSPIRE

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The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on $\gamma p \rightarrow \pi N$ multipoles

A.V. Anisovich
(
- Bonn U., HISKP and
- St. Petersburg, INP
)
,
R. Beck
(
- Bonn U., HISKP
)
,
M. Döring
(
- George Washington U. and
- Jefferson Lab
)
,
M. Gottschall
(
- Bonn U., HISKP
)
,
J. Hartmann
(
- Bonn U., HISKP
)

Apr 19, 2016

18 pages

Published in:

Eur.Phys.J.A 52 (2016) 9, 284

Published: Sep 16, 2016

e-Print:

1604.05704 [nucl-th]

DOI:

10.1140/epja/i2016-16284-9

View in:

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Abstract: (Springer)

New data on pion-photoproduction off the proton have been included in the partial-wave analyses Bonn-Gatchina and SAID and in the dynamical coupled-channel approach Jülich-Bonn. All reproduce the recent new data well: the double-polarization data for E, G, H, P and T in

\gamma p\rightarrow \pi^{0}p

from ELSA, the beam asymmetry

\Sigma

for

\gamma p\rightarrow \pi^{0}p

and

\pi^{+}n

from Jefferson Laboratory, and the precise new differential cross section and beam asymmetry data

\Sigma

for

\gamma p\rightarrow \pi^{0}p

from MAMI. The new fit results for the multipoles are compared with predictions not taking into account the new data. The mutual agreement is improved considerably but still far from being perfect.

beam: asymmetry
pi: photoproduction
polarization
multipole
differential cross section
coupled channel
Bonn ELSA Stor
partial wave
Mainz Linac
Jefferson Lab

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Figures(53)

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