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Regge-plus-resonance approach to strangeness production from the deuteron

(2011)
Author
Promoter
(UGent)
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Project
HPC-UGent: the central High Performance Computing infrastructure of Ghent University
Abstract
Electromagnetic production of strangeness plays a prominent role in our quest to chart the excitation spectrum of the nucleon. Despite the large body of high-quality p(g*,K)Y data, phenomenological analyses of these reactions have not led to an unequivocal outcome. The persistent lack of consensus on the role of different nucleon resonances in the reaction dynamics can be attributed in part to the important role played by non-resonant dynamics. In this dissertation, photon- and electron-induced kaon production off nucleons and deuterium is studied using an efficient reaction model developed at Ghent University, coined Regge-plus-resonance, that successfully reconciles an isobaric approach in the resonance region with Regge phenomenology at higher energies. The dominant non-resonant amplitudes are modelled in terms of K+(494) and K*+(892) t-channel Regge-trajectory exchange and are fixed by high-energy data. In a next step, this amplitude is extrapolated into the resonance region and refined by adding individual N* and Delta* terms in the s-channel. We show how the Regge-plus-resonance model, which is optimised to data obtained off proton targets, can be transformed to reliably describe all reactions with a kaon-hyperon pair in the final state. In addition to the study of strangeness production off the proton, it pays to consider the same reaction on more complex targets, such as the deuteron. In this dissertation quasi-free kaon production from the deuteron is investigated using the Regge-plus-resonance elementary operator within the relativistic plane-wave impulse approximation. In addition, the effects of the hyperon-nucleon final-state interaction are analysed using the non-relativistic one-boson-exchange model developed at Jülich as input. Numerical results for (semi-)inclusive and exclusive differential cross sections are presented and we investigate the formalism’s sensitivity to its different ingredients. The characteristic shape of the cross section is studied and distinct kinematic regions are identified where the 2H(g,K)YN reaction can be exploited to learn about elementary kaon production or hyperon-nucleon rescattering. Finally, model calculations are confronted with the first published 2H(g,K)YN data.
Keywords
Regge-plus-resonance model, strangeness production, photonuclear reactions, kaon production, Regge phenomenology

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Citation

Please use this url to cite or link to this publication:

Chicago
Vancraeyveld, Pieter. 2011. “Regge-plus-resonance Approach to Strangeness Production from the Deuteron”. Ghent, Belgium: Ghent University. Faculty of Sciences.
APA
Vancraeyveld, P. (2011). Regge-plus-resonance approach to strangeness production from the deuteron. Ghent University. Faculty of Sciences, Ghent, Belgium.
Vancouver
1.
Vancraeyveld P. Regge-plus-resonance approach to strangeness production from the deuteron. [Ghent, Belgium]: Ghent University. Faculty of Sciences; 2011.
MLA
Vancraeyveld, Pieter. “Regge-plus-resonance Approach to Strangeness Production from the Deuteron.” 2011 : n. pag. Print.
@phdthesis{2034461,
  abstract     = {Electromagnetic production of strangeness plays a prominent role in our quest to chart the excitation spectrum of the nucleon. Despite the large body of high-quality p(g*,K)Y data, phenomenological analyses of these reactions have not led to an unequivocal outcome. The persistent lack of consensus on the role of different nucleon resonances in the reaction dynamics can be attributed in part to the important role played by non-resonant dynamics. In this dissertation, photon- and electron-induced kaon production off nucleons and deuterium is studied using an efficient reaction model developed at Ghent University, coined Regge-plus-resonance, that successfully reconciles an isobaric approach in the resonance region with Regge phenomenology at higher energies. The dominant non-resonant amplitudes are modelled in terms of K+(494) and K*+(892) t-channel Regge-trajectory exchange and are fixed by high-energy data. In a next step, this amplitude is extrapolated into the resonance region and refined by adding individual N* and Delta* terms in the s-channel. We show how the Regge-plus-resonance model, which is optimised to data obtained off proton targets, can be transformed to reliably describe all reactions with a kaon-hyperon pair in the final state. In addition to the study of strangeness production off the proton, it pays to consider the same reaction on more complex targets, such as the deuteron. In this dissertation quasi-free kaon production from the deuteron is investigated using the Regge-plus-resonance elementary operator within the relativistic plane-wave impulse approximation. In addition, the effects of the hyperon-nucleon final-state interaction are analysed using the non-relativistic one-boson-exchange model developed at J{\"u}lich as input. Numerical results for (semi-)inclusive and exclusive differential cross sections are presented and we investigate the formalism{\textquoteright}s sensitivity to its different ingredients. The characteristic shape of the cross section is studied and distinct kinematic regions are identified where the 2H(g,K)YN reaction can be exploited to learn about elementary kaon production or hyperon-nucleon rescattering. Finally, model calculations are confronted with the first published 2H(g,K)YN data.},
  author       = {Vancraeyveld, Pieter},
  keyword      = {Regge-plus-resonance model,strangeness production,photonuclear reactions,kaon production,Regge phenomenology},
  language     = {eng},
  pages        = {X, 201},
  publisher    = {Ghent University. Faculty of Sciences},
  school       = {Ghent University},
  title        = {Regge-plus-resonance approach to strangeness production from the deuteron},
  year         = {2011},
}