Download or read book Polarization of Hyperons in Elementary Photoproduction written by Reinhard Schumacher and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent measurements using the CLAS detector at Jefferson Lab of the reactions {gamma} + p {yields} K{sup +} + {Lambda} and {gamma} + p {yields} K{sup +} + {Sigma}{sup 0} have been used to extract the spin transfer coefficients C{sub x} and C{sub z} for the first time. These observables quantify the degree of the photon circular polarization that is transferred to the recoiling hyperons in the scattering plane. The unexpected result is that {Lambda} hyperons are produced '100% polarized' as seen when combining C{sub x} and C{sub z} with the induced transverse polarization, P. Furthermore, C{sub x} and C{sub z} seem to be linearly related. This paper discusses the experimental results and offers a hypothesis which can explain these observations. We show how the produced strange quark can be subject to a pure spin-orbit type of interaction which preserves its state of polarization throughout the hadronization process.
Download or read book The Polarization of Lambda 0 Hyperons in Quasi real Photoproduction written by Michiel Demey and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Polarization of 0 Hyperons in Quasi real Photoproduction written by Michiel Demey and published by . This book was released on 2007 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoproduction of and 0 Hyperons Using Linearly Polarized Photons written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Proceedings of The IX International Conference on Hypernuclear and Strange Particle Physics written by Josef Pochodzalla and published by Springer Science & Business Media. This book was released on 2008-06-27 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the IX International Conference on Hypernuclear and Strange Particle Physics (HYP 2006). This conference series is devoted to the progress of our knowledge about strangeness flavor in hadron and nuclear physics. Besides the traditional topics such as hadron structure, hypernuclear spectroscopy and weak decay of hypernuclei, a particular focus of this conference was on the properties of strange mesons and their binding in nuclear systems.
Download or read book Photoproduction and Rescattering of Polarized Hyperons in Deuterium written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Excited states of hadrons are essential for understanding confinement and non-perturbative QCD. Constituent quark models are successful in describing the first excited nucleon (N *) states in each partial wave, but predict more states than have been observed experimentally. Diquark correlations have been suggested as one explanation for these â missingâ states. Recent advances in both theory (coupled-channels calculations) and experiment (high-statistics polarization measurements) offer new tools for resolving this question. The g13 experiment at Jefferson Lab, completed in June 2007, forms an important part of this effort. It used linearly and circularly polarized photons and a deuteron target to study N * states produced on the neutron, primarily through their decays into kaons and hyperons. The self-analyzing property of the? is ideally suited for this purpose. The general nature and exceptional size of the data set will, however, produce a wide range of results, including opening.
Download or read book Transverse Polarization of L Hyperons from Quasi real Photoproduction on Nuclei written by and published by . This book was released on 2014 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transverse Polarization of lambda Hyperons from Quasi real Photoproduction on Nuclei written by and published by . This book was released on 2014 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transverse Polarization of L63 lambda and L63 anti lambda Hyperons in Quasireal Photoproduction written by Avetik Ajrapetjan and published by . This book was released on 2007 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoproduction of and 0 Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab written by and published by . This book was released on 2002 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Photoproduction of Lambda and Sigma Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Quasi Real Photo Production of Hyperons written by Andreas Johannes Reischl and published by . This book was released on 2007 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoproduction Of Lambda And Sigma sup 0 Hyperons Off Protons in the Nucleon Resonance Region Using CLAS at Jefferson Lab written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Quasi real Photo production of Hyperons on Polarized 1 2H Targets written by David Heesbeen and published by . This book was released on 2003 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of Elementary Particles written by John David Jackson and published by Princeton University Press. This book was released on 2015-12-08 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an introductory account of the physics of elementary particles and their interactions, with a minimum of formal apparatus and an ease of reading which, at present, is found in few other books in physics. It is designed for graduate students and for physicists not specializing in the field. The various phenomena are interpreted and correlated largely by means of elementary theoretical arguments needing little background beyond a first course in quantum mechanics. Numerous references to the original literature will allow the reader to probe more deeply into the topics discussed. Selected topics include scattering, photoproduction, K-mesons and hyperons, theoretical models, weak decay processes, and analysis of recent experiments on nonconservation of parity. Originally published in 1958. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Download or read book Nstar2007 written by Hans W. Hammer and published by Springer Science & Business Media. This book was released on 2009-04-23 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: c Societ` a Italiana di Fisica / Springer-Verlag 2008 The 11th Workshop on The Physics of Excited Nucleons, NSTAR 2007, was held at the University of Bonn, Germany,fromSeptember5–8,2007.ItwasthelatestofaseriesofsuccessfulconferencesattheRensselaerPolytechnic Institute (1988), Florida State University (1994 and 2005), Je?erson Lab (1995 and 2000), INT Seattle (1996), GWU ? Washington (1997), ECT Trento (1998), Mainz (2001), Pittsburgh (2002) and the LPSC Grenoble (2004). A Baryon Resonance Analysis Group (BRAG) meeting immediately before the workshop focused especially on the physical meaning of bare and dressed scattering matrix singularities. A focus workshop on? photoproduction rounded o? the NSTAR 2007. The goal of NSTAR 2007 was to bring together experts on all areas of physics relevant to baryon spectroscopy, both in experiment and theory. Latest results were presented in 30 plenary talks and 34 parallel contributions, the proceedings of which are collected in this volume. The workshop was attended by 123 scientists of 41 universities and laboratories from 16 countries. Exciting new high-precision data were shown from facilities in Asia, the US and Europe, e.g. BES, BNL, COSY, ELSA, GRAAL, JLab, MAMI and LEPS. Large-acceptance detectors provide complete angular distributions in many reaction channels. Particular emphasis is put on the measurement of single and double polarisation observables such that many new polarization measurements can be expected in forthcoming meetings.
Download or read book Transverse Polarization of and Hyperons in Quasireal Photoproduction written by and published by . This book was released on 2007 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
