The Virtual Compton Scattering at TJNAF. PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Virtual Compton Scattering at TJNAF. PDF full book. Access full book title The Virtual Compton Scattering at TJNAF. by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The Virtual Compton Scattering is a powerful tool to probe the internal structure of the proton. A VCS experiment (E93050) was performed in Hall A at JLAB below and above the pion threshold. In the resonance region, cross sections of pion and photon electroproduction have been produced; below the pion threshold, evidence of the effect of the polarisabilities on the cross sections has been proved.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The Virtual Compton Scattering is a powerful tool to probe the internal structure of the proton. A VCS experiment (E93050) was performed in Hall A at JLAB below and above the pion threshold. In the resonance region, cross sections of pion and photon electroproduction have been produced; below the pion threshold, evidence of the effect of the polarisabilities on the cross sections has been proved.
Author: Sebastian Haan
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Wolf-Dieter Nowak
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Jakob Christoph Schönleber
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author: Jose Luis Goity
Publisher: World Scientific
ISBN: 9814544140
Category :
Languages : en
Pages : 356
Get Book Here
Book Description
This volume contains the lectures presented at the 12th Annual Hampton University Graduate Studies at the Continuous Electron Beam Accelerator Facility (HUGS at CEBAF), which took place at Jefferson Lab and Hampton University from June 2nd to June 20th, 1997. It reflects the current quest for understanding strong interaction physics in the nonperturbative regime and its connections with the fundamental theory of the strong interactions, i.e. QCD. This quest is shaping current theoretical and experimental efforts in nuclear physics, as manifested by the experimental programs at Jefferson Lab and other facilities, and theoretical approaches that keep a rigorous connection with QCD, such as the method of chiral Lagrangians.
Author: Ruonan Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Understanding how the visible matter in the universe arises from its elementary quark andgluon constituents is a central question for science. The visible world is founded on the proton, the only composite building block of matter that is stable in nature. Consequently, understanding the formation of matter relies on explaining the dynamics and the properties of the proton's bound state. A fundamental property of the proton involves the system's response to an external electromagnetic (EM) field. It is characterized by the EM polarizabilities that describe how easily the charge and magnetization distributions inside the system are distorted by the EM field. When the polarizabilities are generalized to finite momentum transfer, their Fourier transform can map out the spatial distribution of the polarization densities in a proton subject to an EM field. This thesis focuses on the measurement of the proton generalized polarizabilities (GPs) at low four-momentum transfer in experimental Hall C at the Thomas Jefferson National Accelerator Facility (TJNAF). Among the six independent GPs, we will focus on the electric (aE1) and the magnetic (bM1) scalar GPs. The GPs can be accessed through measurements of the Virtual Compton Scattering reaction, by replacing the incoming real photon of the Compton scattering process with a space-like virtual photon. The outgoing real photon provides the EM perturbation to the system. In addition, the Dispersion Relation Formalism is used for generalized polarizability extraction. In this work, the two scalar GPs measured with unprecedented precision, and the measurements help explore a momentum transfer region where an anomalous enhancement of the electric GP that contradicts the predictions of nuclear theory has been observed.
Author: Sigfrido Boffi
Publisher: World Scientific
ISBN: 9814486124
Category : Science
Languages : en
Pages : 523
Get Book Here
Book Description
The 9th Conference on Problems in Theoretical Nuclear Physics was organized as part of the project “Theoretical Physics of Nuclei and Many-Body Systems” involving 17 Italian universities and sponsored by the Italian Ministry of Research and University.This volume includes the invited papers on the main subjects of the project and all the individual contributions on special topics. It reviews the work performed in the last two years by the participating Italian community of nuclear theorists. In addition, national and international perspectives are focussed by a panel on the future programmes of the large Italian laboratories and of the experimental community, as well as in a general review by A Faessler.
Author: S. Boffi
Publisher: World Scientific
ISBN: 9812705147
Category : Science
Languages : en
Pages : 523
Get Book Here
Book Description
The 9th Conference on Problems in Theoretical Nuclear Physics was organized as part of the project OC Theoretical Physics of Nuclei and Many-Body SystemsOCO involving 17 Italian universities and sponsored by the Italian Ministry of Research and University.This volume includes the invited papers on the main subjects of the project and all the individual contributions on special topics. It reviews the work performed in the last two years by the participating Italian community of nuclear theorists. In addition, national and international perspectives are focussed by a panel on the future programmes of the large Italian laboratories and of the experimental community, as well as in a general review by A Faessler."
Author: V. Burkert
Publisher: World Scientific
ISBN: 9789810244996
Category : Science
Languages : en
Pages : 458
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Exotic mesons, particles that have quantum numbers that are inaccessible to conventional quark-model mesons, are predicted by quantum chromodynamics (QCD), but past experiments seeking to identify exotic candidates have produced controversial results. The HyCLAS experiment (E04005) at Thomas Jefferson National Accelerator Facility (TJNAF) proposes the use of the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS) in Hall B to study the photoproduction of exotic mesons. However, the base detector package at CLAS is not ideal for observing and measuring neutral particles, particularly at forward angles. The Deeply Virtual Compton Scattering (DVCS) experiment at TJNAF has commissioned a new calorimeter for detecting small-angle photons, but studies must be performed to determine its suitability for a meson spectroscopy experiment. The [eta][pi] system has been under especial scrutiny in the community as a source for potential exotics, so the new calorimeter's ability at reconstructing these resonances must be evaluated. To achieve this, the invariant mass of showers in the calorimeter are reconstructed. Also, two electroproduction reaction channels analogous to photoproduction channels of interest to HyCLAS are examined in DVCS data. It is found that, while not ideal, the new calorimeter will allow access to additional reaction channels, and its inclusion in HyCLAS is warranted. Results in basic shower reconstruction show that the calorimeter has good effi ciency in resolving [pi]° decays, but its [eta] reconstruction is not as strong. When examining ep → ep[pi]°[eta], preliminary reconstruction of the [eta][pi]° system shows faint signals in the a0(980) region. In the ep → e n [pi]+ [eta] channel, preliminary reconstruction of the [eta][pi]+ system gave good signals in the a0(980) and a2(1320) regions, but statistics were poor. While more analyses are necessary to improve statistics and remove background, these preliminary results support the claim that the DVCS calorimeter will be a valuable addition to CLAS for upcoming exotic meson searches in photoproduction.
