Photoproduction Of And 0 Hyperons Off Protons In The Nucleon Resonance Region Using Clas At Jefferson Lab PDF Download
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Total Pages | : 241 |
Release | : 2002 |
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Download Photoproduction of ? and ?0 Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab Book in PDF, ePub and Kindle
The differential cross section and hyperon recoil polarizations of the photoproduction of the ground state hyperons, ? p → K+ ? and ? p → K+ ?0 , have been measured with the CLAS at Jefferson Lab up to a photon energy in the lab of 2.325 GeV. The results for both channels show significantly larger cross section in the middle to forward angles than have been observed previously by the SAPHIR Collaboration. Both reactions show significantly more backward peaking in the angular distributions than has previously been possible to observe. The backward peaking hints that hyperon resonances in the u-channel play a significant role in the production mechanism. In addition, in the ? p → K+ ? reaction, a previously unobserved bump in the cross section was observed at forward angles, centered on a W of 1.95 GeV with a width of approximately ? = 100 MeV. In both ? p → K+ Y reactions the recoil polarization in the forward direction seems reasonably well reproduced by t-channel interferences in a Regge model calculation as well as hadrodynamic models that include kaon resonances in the t-channel. The recoil polarization for ? p → K+ ? shows a significant enhancement around a W of 1.9 GeV in the backward angles, which is a sign of resonance activity in this vicinity. The polarization of ? p → K+ ?0 at backward angles is, in contrast, less pronounced and mostly consistent with zero.
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Release | : 2004 |
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Download Photoproduction Of[Lambda] And[Sigma][sup 0] Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab Book in PDF, ePub and Kindle
The differential cross section and hyperon recoil polarizations of the photoproduction of the ground state hyperons, [gamma] p[yields] K[sup+][Lambda] and[gamma] p[yields] K[sup+][Sigma][sup 0], have been measured with the CLAS at Jefferson Lab up to a photon energy in the lab of 2.325 GeV. The results for both channels show significantly larger cross section in the middle to forward angles than have been observed previously by the SAPHIR Collaboration. Both reactions show significantly more backward peaking in the angular distributions than has previously been possible to observe. The backward peaking hints that hyperon resonances in the u-channel play a significant role in the production mechanism. In addition, in the[gamma] p[yields] K[sup+][Lambda] reaction, a previously unobserved bump in the cross section was observed at forward angles, centered on a W of 1.95 GeV with a width of approximately[Gamma]= 100 MeV. In both[gamma] p[yields] K[sup+] Y reactions the recoil polarization in the forward direction seems reasonably well reproduced by t-channel interferences in a Regge model calculation as well as hadrodynamic models that include kaon resonances in the t-channel. The recoil polarization for[gamma] p[yields] K[sup+][Lambda] shows a significant enhancement around a W of 1.9 GeV in the backward angles, which is a sign of resonance activity in this vicinity. The polarization of[gamma] p[yields] K[sup+][Sigma][sup 0] at backward angles is, in contrast, less pronounced and mostly consistent with zero.
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Release | : 2002 |
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Download Photoproduction of [Lambda] and [Sigma]° Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab Book in PDF, ePub and Kindle
The differential cross section and hyperon recoil polarizations of the photoproduction of the ground state hyperons, [gamma] p 2!K [Lambda] and [gamma] p 2!K [Sigma]°, have been measured with the CLAS at Jefferson Lab up to a photon energy in the lab of 2.325 GeV. The results for both channels show significantly larger cross section in the middle to forward angles than have been observed previously by the SAPHIR Collaboration. Both reactions show significantly more backward peaking in the angular distributions than has previously been possible to observe. The backward peaking hints that hyperon resonances in the u-channel play a significant role in the production mechanism. In addition, in the [gamma] p 2!K+ [Lambda] reaction, a previously unobserved bump in the cross section was observed at forward angles, centered on a W of 1.95 GeV with a width of approximately [Gamma] = 100 MeV. In both [gamma] p 2!K+ Y reactions the recoil polarization in the forward direction seems reasonably well reproduced by t-channel interferences in a Regge model calculation as well as hadrodynamic models that include kaon resonances in the t-channel. The recoil polarization for [gamma] p 2!K+ [Lambda] shows a significant enhancement around a W of 1.9 GeV in the backward angles, which is a sign of resonance activity in this vicinity. The polarization of [gamma] p 2!K+ [Sigma]° at backward angles is, in contrast, less pronounced and mostly consistent with zero.
Author | : John W. C. McNabb |
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Total Pages | : 0 |
Release | : 2002 |
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Download Photoproduction of Lambda and Sigma0 Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab Book in PDF, ePub and Kindle
Author | : Kazushige Maeda |
Publisher | : World Scientific |
Total Pages | : 475 |
Release | : 2004-06-01 |
Genre | : Science |
ISBN | : 9814483273 |
Download Electrophotoproduction Of Strangeness On Nucleons And Nuclei: Proceedings Of The International Symposium Book in PDF, ePub and Kindle
This book contains important papers on the strangeness production processes and strangeness nuclear physics resulting from electromagnetic interaction. Both experimentalists and theorists in the field present information on recent activities and discuss the prospects of related fields.
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Release | : 2016 |
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Download Photoproduction of ? and ?0 Hyperons Using Linearly Polarized Photons Book in PDF, ePub and Kindle
Measurements of polarization observables for the reactions $\vec{\gamma} p \rightarrow K+̂ \Lambda$ and $\vec{\gamma} p \rightarrow K+̂ \Sigma0̂$ have been performed. This is part of a programme of measurements designed to study the spectrum of baryon resonances. The accurate measurement of several polarization observables provides tight constraints for phenomenological fits. Beam-recoil observables for the $\vec{\gamma} p \rightarrow K+̂ \Sigma0̂$ reaction have not been reported before now. Furthermore, the measurements were carried out using linearly polarized photon beams and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71GeV.
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Release | : 2016 |
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Download Study of the Hyperon-Nucleon Interaction in Exclusive [Lambda] Photoproduction Off the Deuteron Book in PDF, ePub and Kindle
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Total Pages | : 812 |
Release | : 2003 |
Genre | : Dissertations, Academic |
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Download Dissertation Abstracts International Book in PDF, ePub and Kindle
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Release | : 2004 |
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Download Eta Photoproduction from the Proton Using CLAS. Book in PDF, ePub and Kindle
Differential cross sections for the reaction[gamma]p[yields] np have been measured for incident photon energies from 0.75 to 1.95 GeV. Data were taken using the CLAS spectrometer and tagged photon facility at Jefferson Lab. The data provide the first extensive measurements of angular distributions for this process above the S11 (1535) resonance in the range up to W= 2.1 GeV.
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Total Pages | : 6 |
Release | : 2014 |
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Download Measurement of Excited Hyperons in Photoproduction at CLAS. Book in PDF, ePub and Kindle
Measurement results of photoproduced excited hyperon states using the CLAS detector at Jefferson Lab are shown. The invariant mass distribution of the?(1405) has recently been shown to be different for each of the three Sigma pi channels that it decays to, showing that there is prominent interference between the isospin I=0 and I=1 isospin amplitudes. Measurements of the differential and total cross sections of the three hyperons?(1405),?°(1385), and Lambda(1520) are presented and compared. Prospects of future studies using a 12 GeV beam with the GlueX detector are briefly given.