Probing Nucleon Structure With Meson Electro Production In Hall C PDF Download
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Release | : 2011 |
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Download Probing Nucleon Structure with Meson Electro-production in Hall C. Book in PDF, ePub and Kindle
Meson electro-production is used in Hall C at Jefferson Lab to probe nucleon, baryon and nuclear structure. The experimental program in Hall C includes studies of semi-inclusive pion production, p, d(e, e'[pi]±)X, where low energy factorization has been observed, suggesting that these reactions can be used to probe nucleon structure, including transverse momentum distributions of quarks, at energies available at JLab after the upcoming 12 GeV upgrade.
Author | : Wenliang Li |
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Total Pages | : 0 |
Release | : 2017 |
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Download Exclusive Backward-Angle Omega Meson Electroproduction Book in PDF, ePub and Kindle
Exclusive meson electroproduction at different squared four-momenta of the exchanged virtual photon, Q^2 , and at different four-momentum transfers, t and u, can be used to probe QCD's transition from hadronic degrees of freedom at the long distance scale to quark-gluon degrees of freedom at the short distance scale. Backward-angle meson electroproduction was previously ignored, but is anticipated to offer complimentary information to conventional forward-angle meson electroproduction studies on nucleon structure. This work is a pioneering study of backward-angle omega cross sections through the exclusive 1H(e, e' p)omega reaction using the missing mass reconstruction technique. The extracted cross sections are separated into the transverse (T), longitudinal (L), and LT, TT interference terms. The analyzed data were part of experiment E01-004 (Fpi-2), which used 2.6-5.2 GeV electron beams and HMS+SOS spectrometers in Jefferson Lab Hall C. The primary objective was to detect coincidence pion in the forward-angle, where the backward-angle omega events were fortuitously detected. The experiment has central Q2 values of 1.60 and 2.45 GeV2 , at W = 2.21 GeV. There was significant coverage in phi and epsilon, which allowed separation of sigma_T,L,LT,TT . The data set has a unique u coverage of −u ∼ 0, which corresponds to −t > 4 GeV2 . The separated sigma_T result suggest a flat ∼ 1/Q^1.33±1.21 dependence, whereas sigma_L seems to hold a stronger 1/Q^9.43±6.28 dependence. The sigma_L/sigma_T ratio indicate sigma_T dominance at Q2 = 2.45 GeV2 at the ∼90% confidence level. After translating the results into the −t space of the published CLAS data, our data show evidence of a backward-angle omega electroproduction peak at both Q2 settings. Previously, this phenomenon showing both forward and backward-angle peaks was only observed in the meson photoproduction data. Through comparison of our sigma_T data with the prediction of the Transition Distribution Amplitude (TDA) model, and signs of sigma_T dominance, promising indications of the applicability of the TDA factorization are demonstrated at a much lower Q2 value than its preferred range of Q2 > 10 GeV2. These studies have opened a new means to study the transition of the nucleon wavefunction through backward-angle experimental observables.
Author | : Gary Howell |
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Total Pages | : 138 |
Release | : 2013 |
Genre | : Meson-nucleon interactions |
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Download Nuclei as Probes of Meson-nucleon Interactions at High and Low Energy Book in PDF, ePub and Kindle
This dissertation explores two main topics: 1) Color Transparency and quasi-elastic knockout reactions involving pions and [rho] mesons; and 2) determination of the J/[psi]-nucleon scattering amplitude and scattering length via J/[psi] electroproduction on the deuteron. It is shown that at the energies available at the COMPASS experiment at CERN, Color Transparency should be detectable in the reaction [pi]+A --> [pi]+p+(A-1)* (proton knockout). It is also shown that Color Transparency should be detectable in the electroproduction reaction [gamma]*+A --> [rho]+p+(A-1)* at small Q2 (where Q2 is the virtuality of the photon) but large t (4-momentum transfer squared to the knocked out proton), which represents an as-yet unexplored kinematic region in the search for CT effects in electroproduction of vector mesons. Calculations are also presented for the reaction [gamma]*+D --> J/[psi]+p+n at JLab energies in order to determine the feasibility of measuring the elastic J/[psi]-nucleon scattering amplitude and/or scattering length. It is found that it may be possible to measure the J/[psi]-nucleon scattering amplitude at lower energies than previous measurements, but the scattering length cannot be measured.
Author | : V. Burkert |
Publisher | : World Scientific |
Total Pages | : 458 |
Release | : 2001 |
Genre | : Science |
ISBN | : 9789810244996 |
Download Excited Nucleons and Hadronic Structure Book in PDF, ePub and Kindle
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.
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Total Pages | : 91 |
Release | : 2013 |
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Download Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction Book in PDF, ePub and Kindle
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Total Pages | : 456 |
Release | : 2002 |
Genre | : Meson-nucleon interactions |
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Download Proceedings of the ... International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon Book in PDF, ePub and Kindle
Author | : Hiroshi Toki |
Publisher | : World Scientific |
Total Pages | : 414 |
Release | : 1996-10-25 |
Genre | : |
ISBN | : 9814546739 |
Download Frontier 96: Nuclear Physics Frontiers With Electroweak Probes - Proceedings Of Xv Rcnp Osaka International Symposium Book in PDF, ePub and Kindle
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Release | : 1999 |
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Download Hard Exclusive Pseudoscalar Meson Electroproduction and Spin Structure of a Nucleon Book in PDF, ePub and Kindle
Author | : C. Hanhart |
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Total Pages | : 101 |
Release | : 2004 |
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Download Meson Production in Nucleon-nucleon Collisions Close to the Threshold Book in PDF, ePub and Kindle
Author | : International Symposium on Meson Nucleon Physics and the Structure of the Nucleon |
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Release | : 1993 |
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Download Proceedings of the 5th International Symposium on Meson Nucleon Physics and the Structure of the Nucleon Book in PDF, ePub and Kindle