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Article overview
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Search for Narrow Nucleon Resonance in $gamma p o eta p$ | A. V. Anisovich
; E. Klempt
; V. Kuznetsov
; V. A. Nikonov
; M. V. Polyakov
; A. V. Sarantsev
; U. Thoma
; | Date: |
15 Aug 2011 | Abstract: | Results of a partial wave analysis of new high-statistics data on $gamma
p o peta$ from MAMI are presented. A fit using known broad resonances and
only standard background amplitudes can not describe the relatively narrow
peaking structure in the cross section in the mass region of 1660-1750 MeV
which follows a minimum. An improved description of the data can be reached by
either assuming the existence of a narrow resonance at a mass of about 1700 MeV
with small photo-coupling or by a threshold effect. In the latter case the
observed structure is explained by a strong (resonant or non-resonant) $gamma
p oomega p$ coupling in the $S_{11}$ partial wave. When the beam asymmetry
data, published by part of the GRAAL collaboration, are included in the fit,
the solution with a narrow $P_{11}$ state is slightly preferred. In that fit,
mass and width of the hypothetical resonance are determined to $Msim$1694 MeV
and $Gammasim 40$ MeV, respectively, and the photo-coupling to $sqrt{{
m
Br}_{eta N}} A_{1/2}^p sim 2.6cdot 10^{-3}$ GeV$^{-1/2}$. High precision
measurements of the target asymmetry and $F$-observable are mandatory to
establish the possible existence of such a narrow state and to provide the
necessary information to define which partial wave is responsible for the
structure observed in the data. | Source: | arXiv, 1108.3010 | Services: | Forum | Review | PDF | Favorites |
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