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Evidence for a negative-parity spin-doublet of nucleon resonances at 1.88,GeV | | A.V. Anisovich
; E. Klempt
; V.A. Nikonov
; A.V. Sarantsev
; H. Schmieden
; U. Thoma
; | | Date: |
26 Nov 2011 | | Abstract: | Evidence is reported for two nucleon resonances with spin-parity $J^P=1/2^-$
and $J^P=3/2^-$ at a mass just below 1.9,GeV. The evidence is derived from a
coupled-channel analysis of a large number of pion and photo-produced
reactions. The two resonances are nearly degenerate in mass with two resonances
of the same spin but positive parity. Such parity doublets are predicted in
models claiming restoration of chiral symmetry in high-mass excitations of the
nucleon. Further examples of spin parity doublets are found in addition.
Alternatively, the spin doublet can be interpreted as member of the 56-plet
expected in the third excitation band of the nucleon. Implications for the
problem of the {it missing resonances} are discussed. | | Source: | arXiv, 1111.6151 | | Services: | Forum | Review | PDF | Favorites | |
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