Exclusive electromagnetic production of strangeness on the nucleon: Regge analysis of recent data

Guidal, M.; Laget, J. M.; Vanderhaeghen, Marc

doi:10.1103/physrevc.68.058201

Cited by 36 publications

(23 citation statements)

References 28 publications

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“…[24] it is demonstrated that, even when using the asymptotic form of the propagators, the order of magnitude of the forward-angle pion and kaon photoproduction observables in the resonance region is remarkably well reproduced in a pure t-channel Regge model. A similar observation holds for kaon electroproduction [34]. These results imply that at forward angles, the global features of the p(γ, K + )Λ reaction in the resonance region can be reasonably well reproduced in terms of background diagrams, with resonance effects constituting relatively minor corrections.…”

Section: B Inclusion Of Resonance Dynamicssupporting

confidence: 72%

Forward-angleK+Λphotoproduction in a Regge-plus-resonance approach

2006

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We present an effective-Lagrangian description for forward-angle K + Λ photoproduction from the proton, valid for photon lab energies from threshold up to 16 GeV. The high-energy part of the amplitude is modeled in terms of t-channel Regge-trajectory exchange. The sensitivity of the calculated observables to the Regge-trajectory phase is investigated in detail. The model is extended towards the resonance region by adding a number of s-channel resonances to the t-channel background. The proposed hybrid "Regge-plus-resonance" (RPR) approach allows one to exploit the p(γ, K + )Λ data in their entirety, resulting in stronger constraints on both the background and resonance couplings. The high-energy data can be used to fix the background contributions, leaving the resonance couplings as the sole free parameters in the resonance region. We compare various implementations of the RPR model, and explore to what extent the description of the data can be improved by introducing the "new" resonances D 13 (1900) and P 11 (1900). Despite its limited number of free parameters, the proposed RPR approach provides an efficient description of the p(γ, K + )Λ dynamics in and beyond the resonance region.

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Section: B Inclusion Of Resonance Dynamicssupporting

confidence: 72%

Forward-angleK+Λphotoproduction in a Regge-plus-resonance approach

2006

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“…Following the convention of the VGL [4][5][6][7] and the Reggeplus-resonance (RPR) [9][10][11][12] models, the "mass scale" s 0 is fixed to s 0 = 1 GeV 2 . In Ref.…”

Section: Transition Currentsmentioning

confidence: 99%

“…In this regard it is worth noting that the measured p(γ * ,K + )Λ unseparated cross section σ U at high energies can be reproduced by the Vanderhaeghen-Guidal-Laget (VGL) model [4][5][6][7] after introducing an effective kaon EM form factor. The kaon EM cutoff energy employed in the VGL model is significantly increased compared to the value extracted from elastic eK scattering.…”

Section: Introductionmentioning

confidence: 99%

K+Λelectroproduction above the resonance region

2014

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Background:In π + n and π − p electroproduction, conventional models cannot satisfactorily explain the data above the resonance region, in particular the transverse cross section. Although no high-energy L-T-separated cross-section data are available to date, a similar scenario can be inferred for K + Λ electroproduction. Purpose: Develop a phenomenological model for the p(γ * ,K + )Λ reaction at forward angles and high-energies. Propose a universal framework for interpreting charged-kaon and charged-pion electroproduction above the resonance region. Method: Guided by the recent model for charged-pion electroproduction, developed by the authors, a framework for K + Λ electroproduction at high energies and forward angles is constructed. To this end, a Reggeized background model for K + Λ photoproduction is first developed. This model is used as a starting base to set up an electroproduction framework. Results: The few available data of the unseparated p(γ * ,K + )Λ cross section are well explained by the model. Predictions for the L-T-separation experiment planned with the 12 GeV upgrade at Jefferson Lab are given. The newly proposed framework predicts an increased magnitude for the transverse structure function, similar to the situation in charged-pion electroproduction. Conclusions: Within a hadronic framework featuring Reggeized background amplitudes, s-channel resonanceparton effects can explain the observed magnitude of the unseparated p(γ * ,K + )Λ cross section at high energies and forward angles. Thereby, no hardening of the kaon electromagnetic form factor is required.

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“…Data involving known baryon resonances of spin J ≤ 3/2 and later J ≤ 5/2 were fitted and γN, πN, ππN, ηN and KΛ partial widths were extracted [16,17,18,19,20]. The data have also been interpreted by Regge-model calculations [21] using only K and K * exchanges and no s-channel resonances. Only the gross features of the data were reproduced.…”

Section: Introductionmentioning

confidence: 99%

Decays of baryon resonances into ΛK+, ΣK+ and Σ+K0

et al. 2005

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Abstract. Cross sections, beam asymmetries, and recoil polarisations for the reactions γp → K + Λ; γp → K + Σ 0 , and γp → K 0 Σ + have been measured by the SAPHIR, CLAS, and LEPS collaborations with high statistics and good angular coverage for centre-of-mass energies between 1.6 and 2.3 GeV. The combined analysis of these data with data from π and η photoproduction reveals evidence for new baryon resonances in this energy region. A new P11 state with mass 1840 MeV and width 140 MeV was observed contributing to most of the fitted reactions. The data demand the presence of two D13 states at 1870 and 2170 MeV.

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Exclusive electromagnetic production of strangeness on the nucleon: Regge analysis of recent data

Cited by 36 publications

References 28 publications

Forward-angleK+Λphotoproduction in a Regge-plus-resonance approach

Forward-angleK+Λphotoproduction in a Regge-plus-resonance approach

K+Λelectroproduction above the resonance region

Decays of baryon resonances into ΛK+, ΣK+ and Σ+K0

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