Download or read book Photoproduction of Eta and Eta Mesons Using CLAS at JLAB written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this analysis is photoproduced n and n' mesons. The data were obtained in Hall B at Jefferson Lab using a photon beam at an endpoint energy of 4.016 GeV in the spring and summer of 2004. The Hall B photon tagging system and the CLAS spectrometer were used to collect the data. From this data, and in the course of analysis of the Nn and Nn' systems, measurements were made of the differential cross sections for n and n' photoproduction. The differential cross section measurements for the n improve the statistics and slightly improve the kinematic range for world data. The results for the n' represents an almost entirely new dataset which will allow for further analysis of the n' meson. The results of this measurement for the n' extend the statistics and kinematic range of world data dramatically.
Download or read book Photoproduction of Eta and Eta Mesons Using CLAS at JLAB written by Zebulun A. Krahn 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 Photoproduction of and Mesons Using CLAS at JLAB written by and published by . This book was released on 2007 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this analysis is photoproduced ? and ?' mesons. The data were obtained in Hall B at Jefferson Lab using a photon beam at an endpoint energy of 4.016 GeV in the spring and summer of 2004. The Hall B photon tagging system and the CLAS spectrometer were used to collect the data. From this data, and in the course of analysis of the N? and N?' systems, measurements were made of the differential cross sections for ? and ?' photoproduction. The differential cross section measurements for the ? improve the statistics and slightly improve the kinematic range for world data. The results for the ?' represents an almost entirely new dataset which will allow for further analysis of the ?' meson. The results of this measurement for the ?' extend the statistics and kinematic range of world data dramatically.
Download or read book Photoproduction Of Eta And Eta prime Mesons From The Proton written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The excitation spectrum of the proton is comprised of many broad overlapping resonances, making investigations of these resonances very challenging. Two excellent tools in helping deconvolve the spectrum are eta and eta-prime meson photoproduction from the proton. Since the beginning of this new millennium, much progress has been made in measuring eta and eta-prime meson photoproduction from the proton. These new measurements are largely in the form of differential cross sections that now cover the first and second resonance regions. In addition to differential cross section data, there have been a comparatively smaller number of beam asymmetry measurements for eta photoproduction. However, these beam asymmetries cover the energy range up to only about E_gamma = 1.5 GeV. In this talk, I will present preliminary Jefferson Lab CLAS data on beam asymmetry for both the eta and eta-prime. I will also discuss how the new measurements will be useful in understanding the structure and exci.
Download or read book Electro and Photo production of W 783 Mesons Using CLAS at Jefferson Lab written by and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electro- and photoproduction of w(783) from a proton target have been measured in the CLAS detector at the Thomas Jefferson National Accelerator Facility in Newport News VA. The photoproduction data were taken over a photon energy range from 0.5 to 2.3 GeV, while the electroproduction data was obtained over a W range of 1.8-2.5 GeV/c2. Preliminary acceptance corrected center-of-mass angular distributions have been examined for both data sets.
Download or read book Electro and Photoproduction of omega 783 Mesons Using CLAS at Jefferson Lab written by and published by . This book was released on 1999 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electro- and photoproduction of [omega](783) from a proton target have been measured in the CLAS detector at the Thomas Jefferson National Accelerator Facility in Newport News, VA. The photoproduction data were taken over a photon energy range from 0.5 to 2.3 GeV, while the electroproduction data was obtained over a W range of 1.8--2.5 GeV/c2. Preliminary acceptance-corrected center-of-mass angular distributions have been examined for both data sets.
Download or read book Meson Photoproduction CLAS written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a brief and selective discussion of meson photoproduction measurements with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Meson photo- production is being used as a tool for various investigations, including the spectroscopy of baryons and mesons and the search for vector-meson medium modifications.
Download or read book Spin Observables in eta Meson Photoproduction on the Proton written by Ross Tucker and published by . This book was released on 2016 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experiments using a polarized beam incident on a polarized frozen spin target (FROST) was conducted at Jefferson Lab in 2010. Results presented here were takenduring the second running period with the FROST target using the CEBAF Large AcceptanceSpectrometer (CLAS) detector at Jefferson Lab, which used transversely-polarizedprotons in a butanol target and a circularly-polarized incident tagged photon beam withenergies between 0.62 and 2.93 GeV. Data are presented for the F and T polarization observablesfor [eta] meson photoproduction on the proton from W = 1.55 GeV to 1.80 GeV.The data presented here will improve the world database and refine theoretical approachesof nucleon structure.
Download or read book Excited Nucleons and Hadronic Structure written by V. Burkert and published by World Scientific. This book was released on 2001 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference NSTAR 2000 was part of a series of conferences and workshops that began in New York in 1988. Since then, the field of excited nucleons and hadron structure has developed enormously, and the scope has broadened. Most significantly, new experimental facilities have come into operation, allowing precise measurements of resonance couplings and transition form factors. The search for ?missing? quark model states and gluonic excitations in complex hadronic channels is now possible.On the theory side, new and promising developments have emerged: quark models with meson degrees of freedom, hybrid baryon models, and studies of baryons in the limit of many colors. For the first time, lattice QCD has been employed to calculate masses of excited nucleons. Nucleon resonances are now recognized as providing significant contributions to the nucleon spin sum rules, as well as the Gerasimov-Drell-Hearn and Bjorken integrals, at finite momentum transfer.
Download or read book The Photoproduction of Eta Mesons at Small Angles written by P. S. L. Booth and published by . This book was released on 1970 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eta 547 and Eta 958 Meson Photoproduction on the Proton written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoproduction of[eta] and[eta][prime] mesons has been studied at the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS) using a tagged photon beam incident on a hydrogen target with photon energies from the respective production thresholds up to 2.4 GeV. The photoproduced mesons were identified via missing mass reconstruction using recoil proton momentum and time of flight information. Data were obtained in a range of[radical]s from threshold to 2.2 GeV for each meson. In this study, differential cross-section measurements for the[gamma]p[yields] p[eta] and[gamma]p[yields] p[eta][prime] reactions are presented, and the results compared to recent data. An isobar analysis of the differential cross-sections is performed. The predicted differential cross-sections from the isobar analysis are used to predict behavior in unmeasured regions of phase space, and to infer total cross sections. For the[gamma]p[yields] p[eta] reaction, a value of the S[sub 11](1535) proton helicity amplitude also was extracted and compared to recent analyses. The data presented greatly extends the energy and angle coverage for differential cross-sections of[eta] photoproduction, and significantly improves the accuracy with which[eta][prime] cross sections are known.
Download or read book Photoproduction of Eta Mesons at 4 and 8 GeV written by David James Ritchie and published by . This book was released on 1972 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Results on Eta and Eta prime Photoproduction on the Proton written by Barry Ritchie and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The experimental situation on eta and eta' photoproduction on the proton is reviewed, emphasizing progress made since 2001. New preliminary results for eta' photoproduction on the proton from Jefferson Lab are presented. Experimental results are compared with several theoretical approaches, with an emphasis on consequences for understanding baryon spectroscopy.
Download or read book Nstar 2001 Proceedings Of The Workshop On The Physics Of Excited Nucleons written by Dieter Drechsel and published by World Scientific. This book was released on 2001-08-28 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of N∗s can provide us with critical insights into the nature of QCD in the confinement domain. The keys to progress in this domain are the identification of its important degrees of freedom and the effective forces between them. The nucleon is the simplest system in which the nonabelian character of QCD is manifest. There are Nc quarks in a baryon because there are Nc colors, and as a consequence Gell-Mann and Zweig were forced to introduce the quarks in order to describe the octet and decuplet baryons.This volume gives a status report on the recent experimental and theoretical results in the field of nucleon resonance physics. A wealth of new high precision data was presented from facilities around the world, such as BES, BNL, ELSA, GRAAL, JLab, MAMI, MIT/Bates, SPring8, and Yerevan. Particular emphasis was laid on polarization degrees of freedom and large acceptance detectors as precision tools for studying small but important transition amplitudes, and the helicity (spin) structure of the nucleon. There were new results describing the nucleon resonance structure on the basis of quantum chromodynamics, either directly in terms of quarks and gluons by means of lattice gauge theory, or in terms of hadrons in the framework of chiral field theories. A status report on duality showed the surprising connections between the physics of the low energy nucleon resonance region and the realm of quark structure functions in deep inelastic scattering. Finally, this volume contains a summary report of the BRAG workshop, devoted to the analysis of baryon resonances.
Download or read book Photoproduction of Eta Mesons in the Forward Direction written by Albert Shunji Ito and published by . This book was released on 1970 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoproduction of Eta Mesons from 3 He written by Marco Pfeiffer and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photoproduction of Eta Mesons Below 2 0 GeV in the Generalised Interference Model written by R. P. Bajpai and published by . This book was released on 1969 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
