Download or read book Measurement of the Unpolarized K Lambda and Sigma0 Electroproduction Cross sections and Interference Terms from the Proton with the CLAS Detector written by Robert J. Feuerbach and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Unpolarized K Lambda and K Sigma 0 Electroproduction Cross Sections and Interference Terms from the Proton with the CLAS Detector written by and published by . This book was released on 2002 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Unpolarized K sup Lambda and K sup Sigma sup 0 Electroproduction Cross Sections and Interference Terms from the Proton with the CLAS Detector written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the CLAS detector, we measure the K[sup+][Lambda] and K[sup+][Sigma][sup 0] electroproduction response functions over the continuous kinematic range from threshold to W= 2.05 GeV and for Q[sup 2] between 0.5 and 1.5 (GeV/c)[sup 2], with nearly complete angular coverage in the center-of-momentum frame angles. The[sigma][sub T]+[epsilon][sigma][sub L], [sigma][sub TT] terms are extracted and compared to recent theoretical calculations based upon a hadrodynamic effective-Lagrangian framework. From examining the W-dependence of the response functions for the K[sup+][Lambda] final state, we find features in the ([sigma][sub T]+[epsilon][sigma][sub L]) term in the W= 1.75 to 1.90GeV region, similar to features seen in recent photoproduction results. In general, the[sigma][sub TT] and[sigma][sub LT] response-functions for[Lambda] production are of the same order of magnitude as the ([sigma][sub T]+[epsilon][sigma][sub L]) term, suggesting that both[sigma][sub T] and[sigma][sub L] contribute significantly. For the K[sup+][Sigma][sup 0] final state the W-dependence of the ([sigma][sub T]+[epsilon][sigma][sub L]) and[sigma][sub TT] terms have large, resonant-like features near W= 1.9GeV. Unlike in[Lambda] electroproduction, the[sigma][sub LT] interference term for[Sigma][sup 0] electroproduction is found to be consistent with zero across nearly the entire kinematic range, while[sigma][sub TT] is comparable in magnitude to the[sigma][sub T]+[epsilon][sigma][sub L] differential cross-section. The models, while achieving some qualitative agreement with the data, fail to both describe the details of the angular distributions and reproduce the resonant-like behavior observed.
Download or read book Measurement of the Unpolarized K K Lambda and K 0 K Sigma 0 Electroproduction Cross section Off the Proton with KAOS spectrometer written by Salvador Sánchez Majos and published by . This book was released on 2012 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Unpolarized K Lambda and K Sigma 0 Electroproduction Cross section Off the Proton with KAOS spectrometer written by Salvador Sánchez Majos and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Differential Cross Sections and Cx and Cz for Gamma P K Lambda and Gamma P K Sigma0 Using CLAS at Jefferson Lab written by Robert K. Bradford and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Measurement of Unpolarized Cross Sections and Polarized Cross Section Differences of Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory Using CLAS e1 dvcs2 written by Nicholas A. N. Hirlinger Saylor and published by . This book was released on 2013 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Differential Cross Sections and Cx and Cz for Gamma Photon proton Going to Kaon lambda Baryon and Gamma Photon proton Going to Kaon sigma Baryon Using CLAS at Jefferson Lab written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents several observables for the reactions [gamma] p → K+[Lambda] and [gamma] p → K+[Sigma]°. In addition to measuring differential cross sections, we have made first measurements of the double polarization observables Cx and Cz. Cx and C z characterize the transfer of polarization from the incident photon to the produced hyperons. Data were obtained at Jefferson Lab using a circularly polarized photon beam at endpoint energies of 2.4, 2.9, and 3.1 GeV. Events were detected with the CLAS spectrometer. In the [Lambda] channel, the cross sections support the recent observation of new resonant structure at W = 1900 MeV. Studies of the invariant cross section, dsdd show scaling behavior suggesting that the production mechanism becomes t-channel dominated near threshold at forward kaon angles. The double polarization observables show that the recoiling [Lambda] is almost maximally polarized along the direction of the incident photon from mid to forward kaon angles. While [Sigma]o differential cross sections are of the same magnitude as the [Lambda] differential cross sections, there is evidence of different physics dominating the production mechanism. The [Sigma]° invariant cross sections do not show the same t-scaling behavior present in the [Lambda] results. The double polarization observables indicate that the [Sigma]° is not polarized as strongly as the [Lambda]. They also fail to identify one preferred polarization axis. Complete interpretation of these results will rely on model calculations. Currently available isobar models obtain varying degrees of success while attempting to predict the double polarization observables. While the models are in better agreement with the differential cross sections, discrepancies with our cross sections indicate that they must be re-optimized in light of the new data. While the data suggest that a Regge model would provide a good description of K+[Lambda] over most of the range in W, the available Regge calculation overstates the strength of the cross section and does not predict Cx and Cz correctly.
Download or read book A measurement of unpolarized cross sections and polarized cross section differences of deeply virtual compton scattering on the proton at Jefferson Laboratory using Clas written by Nicholas Hirlinger-Saylor and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse a pour sujet l'étude de la réaction de la Diffusion Compton Profondément Virtuelle (DVCS) sur le proton e + p -> e' + p' + gamma (DVCS). Cette réaction est mesurée en analysant l'expérience e1-dvcs2 qui a eu lieu dans le Hall B du Jefferson Laboratory avec CLAS. La prise de données s'est déroulée du 22 octobre 2008 jusqu'au 23 janvier 2009. Cette analyse a pour but la détermination des sections efficaces non polarisées et les différences de sections efficaces polarisées du DVCS, dans divers bins en xB, Q^2, t et phi. Cette analyse compare les sections efficaces avec plusieurs mesures existantes du DVCS: une analyse parallèle de e1-dvcs2 et une analyse de e1-dvcs1. En factorisant l'élément de matrice qui correspond au DVCS en deux parties, calculables en QCD perturbative et non perturbative, on peut accéder aux Distributions de Partons Généralisées (GPDs) du proton, et ainsi obtenir une vue en 3D des distributions spatiales et en impulsion des quarks et des gluons dans le proton.
Download or read book Measurement of Unpolarized Inclusive Neutral Current Cross Sections in Positron proton Collisions at s written by Shiraz Habib and published by . This book was released on 2005 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Separation of the Longitudinal and Transverse Cross Sections in the P e E K Lambda and P e E K Sigma Reactions written by and published by . This book was released on 2003 with total page 1480 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report measurements of cross sections for the reaction p(e, e'K)Y, for both the Lambda and Sigma0 hyperon states, at an invariant mass of W = 1.84 GeV and four-momentum transfers 0.5
Download or read book Differential Cross Sections for Gamma P K Y for Lambda and Sigma0 Hyperons written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-statistics cross sections for the reactions? + p → K +? and? + p → K+ +?° have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85
Download or read book Quasi free Cross Section Measurements at CLAS written by and published by . This book was released on 2014 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary measurements of the quasi-free differential cross sections of the gD -->pp-(p), gD --> K*(892)0L(p), and gD --> K+S*(1385)-(p) reactions are shown using data from the Jefferson Lab Hall B CLAS g13 experiment. No experimental cross section data have yet been published on gD --> K*(892)0L(p), and the only published cross section data on gD --> K+S*(1385)-(p) are at forward angles, where t-channel K+ and K*+ exchanges are predicted to dominate. These data can be used to contribute to the search for the "missing" N* resonances, some of which are predicted to have non-negligible couplings to the excited strangeness channels. These cross sections are shown to be sizable compared to the ground-state channels, indicating that it is important to include excited channels in coupled-channels analyses used to extract the N* resonances. In addition, the gD --> pp-(p) data provide a significant increase to the world statistics, and will be used to study rescattering effects within the deuteron.
Download or read book A Comparison of Longitudinal and Transverse Cross Sections in the P e E K lambda and P e E K sigma 0 Reactions written by Richard Matthew Mohring and published by . This book was released on 1999 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Total Cross Sections for K 2 Mesons on Protons and Selected Nuclei from 168 to 343 MeV c and Measurement of the K 2 Mean Life written by G.A. Sayer and published by . This book was released on 1967 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Differential Cross Sections and Cx and Cz for p u2192 K and p u2192 K Using CLAS at Jefferson Lab written by and published by . This book was released on 2005 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents several observables for the reactions ? p → K+? and ? p → K+?°. In addition to measuring differential cross sections, we have made first measurements of the double polarization observables Cx and Cz. Cx and C z characterize the transfer of polarization from the incident photon to the produced hyperons. Data were obtained at Jefferson Lab using a circularly polarized photon beam at endpoint energies of 2.4, 2.9, and 3.1 GeV. Events were detected with the CLAS spectrometer. In the ? channel, the cross sections support the recent observation of new resonant structure at W = 1900 MeV. Studies of the invariant cross section, $d?/top{dt}$ show scaling behavior suggesting that the production mechanism becomes t-channel dominated near threshold at forward kaon angles. The double polarization observables show that the recoiling ? is almost maximally polarized along the direction of the incident photon from mid to forward kaon angles. While ?o differential cross sections are of the same magnitude as the ? differential cross sections, there is evidence of different physics dominating the production mechanism. The ?° invariant cross sections do not show the same t-scaling behavior present in the ? results. The double polarization observables indicate that the ?° is not polarized as strongly as the ?. They also fail to identify one preferred polarization axis. Complete interpretation of these results will rely on model calculations. Currently available isobar models obtain varying degrees of success while attempting to predict the double polarization observables. While the models are in better agreement with the differential cross sections, discrepancies with our cross sections indicate that they must be re-optimized in light of the new data. While the data suggest that a Regge model would provide a good description of K+? over most of the range in W, the available Regge calculation overstates the strength of the cross section and does not predict Cx and Cz correctly.
Download or read book The Measurement of Proton Inelastic Cross Sections Between 77 Mev and 133 Mev written by Raymond Goloskie and published by . This book was released on 1961 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
