Forwardangle K{sup +}{lambda} photoproduction in a Reggeplusresonance approach
Abstract
We present an effectiveLagrangian description for forwardangle K{sup +}{lambda} photoproduction from the proton, valid for photon lab energies from threshold up to 16 GeV. The highenergy part of the amplitude is modeled in terms of tchannel Reggetrajectory exchange. The sensitivity of the calculated observables to the Reggetrajectory phase is investigated in detail. The model is extended toward the resonance region by adding a number of schannel resonances to the tchannel background. The proposed hybrid ''Reggeplusresonance'' (RPR) approach allows one to exploit the p({gamma},K{sup +}){lambda} data in their entirety, resulting in stronger constraints on both the background and resonance couplings. The highenergy 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{sub 13}(1900) and P{sub 11}(1900). Despite its limited number of free parameters, the proposed RPR approach provides an efficient description of the p({gamma},K{sup +}){lambda} dynamics in and beyond the resonance region.
 Authors:
 Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B9000 Gent (Belgium)
 Publication Date:
 OSTI Identifier:
 20771486
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.045207; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; AMPLITUDES; COMPARATIVE EVALUATIONS; GEV RANGE; KAONS PLUS; LAGRANGIAN FIELD THEORY; LAGRANGIAN FUNCTION; LAMBDA BARYONS; PHOTONPROTON INTERACTIONS; PHOTONS; PHOTONUCLEAR REACTIONS; PHOTOPRODUCTION; PROTONS; REGGE TRAJECTORIES; RESONANCE; S CHANNEL; SENSITIVITY; T CHANNEL
Citation Formats
Corthals, T., Ryckebusch, J., and Cauteren, T. van. Forwardangle K{sup +}{lambda} photoproduction in a Reggeplusresonance approach. United States: N. p., 2006.
Web. doi:10.1103/PhysRevC.73.045207.
Corthals, T., Ryckebusch, J., & Cauteren, T. van. Forwardangle K{sup +}{lambda} photoproduction in a Reggeplusresonance approach. United States. doi:10.1103/PhysRevC.73.045207.
Corthals, T., Ryckebusch, J., and Cauteren, T. van. Sat .
"Forwardangle K{sup +}{lambda} photoproduction in a Reggeplusresonance approach". United States.
doi:10.1103/PhysRevC.73.045207.
@article{osti_20771486,
title = {Forwardangle K{sup +}{lambda} photoproduction in a Reggeplusresonance approach},
author = {Corthals, T. and Ryckebusch, J. and Cauteren, T. van},
abstractNote = {We present an effectiveLagrangian description for forwardangle K{sup +}{lambda} photoproduction from the proton, valid for photon lab energies from threshold up to 16 GeV. The highenergy part of the amplitude is modeled in terms of tchannel Reggetrajectory exchange. The sensitivity of the calculated observables to the Reggetrajectory phase is investigated in detail. The model is extended toward the resonance region by adding a number of schannel resonances to the tchannel background. The proposed hybrid ''Reggeplusresonance'' (RPR) approach allows one to exploit the p({gamma},K{sup +}){lambda} data in their entirety, resulting in stronger constraints on both the background and resonance couplings. The highenergy 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{sub 13}(1900) and P{sub 11}(1900). Despite its limited number of free parameters, the proposed RPR approach provides an efficient description of the p({gamma},K{sup +}){lambda} dynamics in and beyond the resonance region.},
doi = {10.1103/PhysRevC.73.045207},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}

An effectiveLagrangian framework for K{sigma} photoproduction from the proton is presented. The proposed model is applicable at forward kaon angles and photon lab energies from threshold up to 16 GeV. The highenergy part of the p({gamma},K{sup +}){sigma}{sup 0} and p({gamma},K{sup 0}){sigma}{sup +} amplitudes is expressed in terms of Reggetrajectory exchange in the t channel. By supplementing this Regge background with a number of schannel resonances, the model is extended toward the resonance region. The resulting ''Reggeplusresonance'' (RPR) approach has the advantage that the background contributions involve only a few parameters, which can be largely constrained by the highenergy data. Thismore »

{ital S}wave resonance coupledchannel approach to the reactions {pi}{sup {minus}}+{ital p}{r_arrow}{eta}+{ital n} and {ital K}{sup {minus}}+{ital p}{r_arrow}{eta}+{Lambda}, and a determination of the {eta}{ital n} and {eta}{Lambda} scattering lengths
The total cross sections of the reactions {pi}{sup {minus}}+{ital p}{r_arrow}{eta}+{ital n} and {ital K}{sup {minus}}+{ital p}{r_arrow}{eta}+{Lambda} near threshold have been calculated in an {ital S}wave resonance coupledchannel approach. The {eta}{ital N} scattering length is [0.621{plus_minus}0.040+{ital i}(0.306{plus_minus}0.034)] fm and the {eta}{Lambda} scattering length is [0.64{plus_minus}0.29+{ital i}(0.80{plus_minus}0.30)] fm. The large value of the {eta}{Lambda} scattering length leads us to speculate on the possible existence of {eta}mesic hypernuclei. {copyright} {ital 1996 The American Physical Society.} 
Reggeplusresonance predictions for neutralkaon photoproduction from the deuteron
We present a Reggeinspired effectiveLagrangian framework for neutralkaon photoproduction from the deuteron. Quasifree kaon production is investigated using the Reggeplusresonance elementary operator within the relativistic planewave impulse approximation. The Reggeplusresonance model was developed to describe photoinduced and electroinduced chargedkaon production off protons. We show how this elementary operator can be transformed to account for the production of neutral kaons from both protons and neutrons. Our results compare favourably to the sole {sup 2}H({gamma},K{sup 0})YN dataset published to date.