Baryon resonance analysis from SAID

Arndt, R. A.; Briscoe, W. J.; Paris, Mark W.; Strakovsky, I. I.; Workman, R. L.

doi:10.1088/1674-1137/33/12/004

Cited by 42 publications

(39 citation statements)

References 44 publications

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“…[6], has been used in a recent coupled-channel fit of πN elastic scattering and πN → ηN reaction data. It gives a realistic description of the data with χ 2 per datum better than any other parametrization or model, to our knowledge [7,8]. The parametrization form used in this fit is given as…”

Section: Formalismmentioning

confidence: 99%

Unified Chew-Mandelstam SAID analysis of pion photoproduction data

et al. 2012

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A unified description of single-pion photoproduction data, together with pion-and etahadroproduction data, has been achieved in a Chew-Mandelstam parametrization which is consistent with unitarity at the two-body level. Energy-dependent and single-energy partial wave analyses of pion photoproduction data have been performed and compared to previous SAID fits and multipoles from the Mainz and Bonn-Gatchina groups.

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Section: Formalismmentioning

confidence: 99%

Unified Chew-Mandelstam SAID analysis of pion photoproduction data

et al. 2012

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“…One common conclusion from [2,10] is the strong coupling of the D 13 (1700)(3/2 − ) state to the π∆ (d-wave) channel, something not intuitive nor expected from ordinary quark models. We should note that, as discussed in [12] there could be some reason to miss some resonances in the analysis if the resonances are too wide (Γ >500 MeV) or they posses a small ratio (BR< 4%) to the channel under consideration.…”

Section: Introductionmentioning

confidence: 98%

Case in favor of theN*(1700)(3/2−)

2013

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Using an interaction extracted from the local hidden gauge Lagrangians, which brings together vector and pseudoscalar mesons, and the coupled channels ρN (s-wave), πN (d-wave), π∆ (s-wave) and π∆ (d-wave), we look in the region of √ s = 1400 − 1850 MeV and we find two resonances dynamically generated by the interaction of these channels, which are naturally associated to the N * (1520)(3/2 − ) and N * (1700)(3/2 − ). The N * (1700)(3/2 − ) appears neatly as a pole in the complex plane. The free parameters of the theory are chosen to fit the πN (d-wave) data. Both the real and imaginary parts of the πN amplitude vanish in our approach in the vicinity of this resonance, similarly to what happens in experimental determinations, what makes this signal very weak in this channel. This feature could explain why this resonance does not show up in some experimental analyses, but the situation is analogous to that of the f 0 (980) resonance, the second scalar meson after the σ(f 0 (500)) in the ππ(d-wave) amplitude. The unitary coupled channel approach followed here, in connection with the experimental data, leads automatically to a pole in the 1700 MeV region and makes this second 3/2 − resonance unavoidable.

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“…The most obvious of these is the fact that the goodness of fit to these sets of amplitudes cannot be translated into a quality of fit to the underlying dataset. The subsequent comparison to experimental πN data may result [23] in poorer than expected agreement. In addition, uncertainties on the SE amplitudes [2][3][4][5] do not account for correlated errors, which can be substantial in some cases.…”

Section: Introductionmentioning

confidence: 82%

Correlations ofπNpartial waves for multireaction analyses

Döring

Revier

Rönchen³

et al. 2016

Phys. Rev. C

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In the search for missing baryonic resonances, many analyses include data from a variety of pionand photon-induced reactions. For elastic πN scattering, however, usually the partial waves of the SAID or other groups are fitted, instead of data. We provide the partial-wave covariance matrices needed to perform correlated χ 2 fits, in which the obtained χ 2 equals the actual χ 2 up to non-linear and normalization corrections. For any analysis relying on partial waves extracted from elastic pion scattering, this is a prerequisite to assess the significance of resonance signals and to assign any uncertainty on results. The influence of systematic errors is also considered.

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Baryon resonance analysis from SAID

Cited by 42 publications

References 44 publications

Unified Chew-Mandelstam SAID analysis of pion photoproduction data

Unified Chew-Mandelstam SAID analysis of pion photoproduction data

Case in favor of theN*(1700)(3/2−)

Correlations ofπNpartial waves for multireaction analyses

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