t-Channel couplings in Kaon-nucleon scattering

Bradford, R.; Martin, B.R.

doi:10.1007/bf01546975

Cited by 5 publications

(12 citation statements)

References 23 publications

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“…In a simple resonance model this behavior is recovered when the vector (g 1 φN N ) and tensor (g 2 φN N ) couplings of the φ meson to the nucleon are equal and have opposite signs. This can be seen from the following parametrizations [23,8],…”

Section: Kk-continuummentioning

confidence: 99%

Erratum:KK¯continuum and isoscalar nucleon form factors [Phys. Rev. C60, 045204 (1999)]

Hammer¹,

Ramsey-Musolf²

2000

Phys. Rev. C

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We analyse the isoscalar vector current form factors of the nucleon using dispersion relations. In addition to the usual vector meson poles, we account for the KK-continuum contribution by drawing upon a recent analytic continuation of KN scattering amplitudes. For the Pauli form factor all strength in the φ region is already given by the continuum contribution, whereas for the Dirac form factor additional strength in the φ region is required. The pertinent implications for the leading strangeness moments are demonstrated as well. We derive a reasonable range for the leading moments which is free of assumptions about the asymptotic behavior of the form factors. We also determine the φN N coupling constants from the form factor fits and directly from the KK → NN partial waves and compare the resulting values.

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Section: Kk-continuummentioning

confidence: 99%

Erratum:KK¯continuum and isoscalar nucleon form factors [Phys. Rev. C60, 045204 (1999)]

Hammer¹,

Ramsey-Musolf²

2000

Phys. Rev. C

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“…Therefore, we use the resonant b 1/2,1/2 0 amplitude from Refs. [30,31] and subtract it from our result. 5 Both analyses use the following form for the amplitude…”

Section: Resultsmentioning

confidence: 99%

“…Only recently has a continuation of the KN amplitudes become possible due to improvements in the data base over the last three decades. A continuation of KN scattering amplitudes has also been performed on the basis of hyperbolic DR [31]. In the latter analysis, however, the t-channel helicity amplitudes have been parametrized by sharp resonance poles, an a priori assumption we seek to avoid in the present analysis.…”

Section: Analytic Continuationmentioning

confidence: 99%

Spectral content of isoscalar nucleon form factors

Hammer

Ramsey-Musolf

1999

Phys. Rev. C

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The nucleon strange vector and isoscalar electromagnetic form factors are studied using a spectral decomposition. The KK contribution to the electric and magnetic radii as well as the magnetic moment is evaluated to all orders in the strong interaction using an analytic continuation of experimental KN scattering amplitudes and bounds from unitarity. The relationship between non-resonant and resonant KK contributions to the form factors is demonstrated, and values for the vector and tensor φNN couplings are derived. The KK spectral functions are used to evaluate the credibility of model calculations for the strange quark vector current form factors.

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“…The example shown in FIGURE 4 addresses the discussion whether a new D 13 (1895) as predicted by Capstick and Roberts or by Loering, Metsch and Petry [33], or a new P 13 (1900) but no D 13 (1895) as suggested by Shklyar, Lenske and Mosel is needed [35], or appropriate tuning of the background contributions is sufficient [34] to understand the cross section peak at 1.9 GeV, which is now even more pronounced than previously reported by SAPHIR [29,30]. The CLAS data points (solid circles) are shown with the combined statistical and fitting uncertainties [28] and compared to the results from SAPHIR (stars [29], triangles [30]) and the ABBHHM collaboration (squares) [31]. FIGURE 4: Total cross section for K + Λ photoproduction.…”

Section: Missing Resonancesmentioning

confidence: 93%

“…Very recently high-statistics photoproduction cross section data for K + Λ and K + Σ 0 final states, with large kinematical coverage in both 1.6GeV<W<2.5GeV and -0.85< cosθ K *<0.95, have become available [28] that allow to look for new resonances decaying into these kaon-hyperon channels. The example shown in FIGURE 4 addresses the discussion whether a new D 13 (1895) as predicted by Capstick and Roberts or by Loering, Metsch and Petry [33], or a new P 13 (1900) but no D 13 (1895) as suggested by Shklyar, Lenske and Mosel is needed [35], or appropriate tuning of the background contributions is sufficient [34] to understand the cross section peak at 1.9 GeV, which is now even more pronounced than previously reported by SAPHIR [29,30].…”

Section: Missing Resonancesmentioning

confidence: 99%

The Nucleon Resonance Program at JLab

Gothe¹

2006

AIP Conference Proceedings

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The status of the program to study baryon resonances at Jefferson Lab will be exemplified by the latest results on resonance parameters and transition form factors in single and double-pion production as well as kaon-hyperon decays.A large portion of the nuclear physics community enthusiastically started to investigate baryon resonances as new optimized detector systems with large solid angle and momentum coverage like CLAS and new high-intensity continuous electron

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t-Channel couplings in Kaon-nucleon scattering

Cited by 5 publications

References 23 publications

Erratum:KK¯continuum and isoscalar nucleon form factors [Phys. Rev. C60, 045204 (1999)]

Erratum:KK¯continuum and isoscalar nucleon form factors [Phys. Rev. C60, 045204 (1999)]

Spectral content of isoscalar nucleon form factors

The Nucleon Resonance Program at JLab

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