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New data on γ→p→→ηp with polarized photons and protons and their implications for N → Nη decays

Müller, J. ; Hartmann, J. ; Grüner, M. ; Afzal, F. ; Anisovich, A. V. ; Bantes, B. ; Bayadilov, D. ; Beck, R. ; Becker, M. LU and Beloglazov, Y. , et al. (2020) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 803.
Abstract

The polarization observables T,E,P,H, and G in photoproduction of η mesons off protons are measured for photon energies from threshold to W=2400 MeV (T), 2280 MeV (E), 1620 MeV (P,H), or 1820 MeV (G), covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, JüBo, and BnGa partial-wave analyses. A refit within the BnGa approach including further data yields precise branching ratios for the Nη decay of nucleon resonances. A Nη-branching ratio of 0.33±0.04 for N(1650)1/2 is found, which reduces the large and controversially discussed Nη-branching ratio difference of the two lowest mass JP=1/2-resonances significantly.

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author collaboration
publishing date
type
Contribution to journal
publication status
published
keywords
Baryon spectroscopy, Meson photoproduction, Polarization observables
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
803
article number
135323
publisher
Elsevier
external identifiers
  • scopus:85082133704
ISSN
0370-2693
DOI
10.1016/j.physletb.2020.135323
language
English
LU publication?
no
id
e5c35aec-3f59-410a-84cf-f0f6b5cbf926
date added to LUP
2020-03-30 15:47:12
date last changed
2020-09-28 13:19:19
@article{e5c35aec-3f59-410a-84cf-f0f6b5cbf926,
  abstract     = {<p>The polarization observables T,E,P,H, and G in photoproduction of η mesons off protons are measured for photon energies from threshold to W=2400 MeV (T), 2280 MeV (E), 1620 MeV (P,H), or 1820 MeV (G), covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, JüBo, and BnGa partial-wave analyses. A refit within the BnGa approach including further data yields precise branching ratios for the Nη decay of nucleon resonances. A Nη-branching ratio of 0.33±0.04 for N(1650)1/2<sup>−</sup> is found, which reduces the large and controversially discussed Nη-branching ratio difference of the two lowest mass J<sup>P</sup>=1/2<sup>−</sup>-resonances significantly.</p>},
  author       = {Müller, J. and Hartmann, J. and Grüner, M. and Afzal, F. and Anisovich, A. V. and Bantes, B. and Bayadilov, D. and Beck, R. and Becker, M. and Beloglazov, Y. and Berlin, A. and Bichow, M. and Böse, S. and Brinkmann, K. T. and Challand, T. and Crede, V. and Dietz, F. and Dieterle, M. and Drexler, P. and Dutz, H. and Eberhardt, H. and Elsner, D. and Ewald, R. and Fornet-Ponse, K. and Friedrich, S. and Frommberger, F. and Funke, C. and Gottschall, M. and Gridnev, A. and Goertz, S. and Gutz, E. and Hammann, C. and Hannen, V. and Hannappel, J. and Herick, J. and Hillert, W. and Hoffmeister, P. and Honisch, C. and Jahn, O. and Jude, T. and Jaegle, I. and Käser, A. and Kaiser, D. and Lang, M. and Messi, F. and Roth, B. and Thiel, A. and Walther, D. and Wendel, C. and Wilson, A.},
  issn         = {0370-2693},
  language     = {eng},
  month        = {04},
  publisher    = {Elsevier},
  series       = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {New data on γ→p→→ηp with polarized photons and protons and their implications for N<sup>⁎</sup> → Nη decays},
  url          = {http://dx.doi.org/10.1016/j.physletb.2020.135323},
  doi          = {10.1016/j.physletb.2020.135323},
  volume       = {803},
  year         = {2020},
}