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

CBELSA/TAPS Collaboration

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

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.

Originalspråkengelska
Artikelnummer135323
TidskriftPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volym803
DOI
StatusPublished - 2020 apr. 10
Externt publiceradJa

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