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Journal ArticleDOI

Forward electroproduction of charged pions from deuterons at Q2 = 1.0 (GeV/c)2

TL;DR: In this article, the ratio of π - to π + electroproduction cross sections from deuterium has been measured in the resonance region, at a four-momentum transfer squared close to −1.0 (GeV/ c ) 2.
About: This article is published in Physics Letters B.The article was published on 1979-09-24. It has received 5 citations till now. The article focuses on the topics: Pion.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the electroproduction of nucleon resonances is discussed from both phenomenological and experimental points of view and the single-quark transition model of virtual photoproduction is taken to be the basis of the theoretical treatment and an explicit realisation in terms of the harmonic oscillator quark model is used extensively in comparison with the experimental results.
Abstract: The electroproduction of nucleon resonances is discussed from both phenomenological and experimental points of view. Emphasis is given to recent data obtained by the 'coincidence' technique when the inelastically scattered electron and one of the decay products of the excited hadronic system are detected simultaneously. Most of the experimental results are confined to the hadronic mass range below 1.8 GeV/c2 and to values of the four-momentum transfer, Q2, less than 3 GeV2. Electroproduction is described as photoproduction by a single polarised virtual photon with negative mass squared given by Q2 so that real photoproduction is seen as the limiting case when Q2 goes to zero. The single-quark transition model of virtual photoproduction (SQTM) is taken to be the basis of the theoretical treatment and an explicit realisation in terms of the harmonic oscillator quark model is used extensively in comparison with the experimental results. It is seen that this quark model gives a good but by no means perfect description of the data even at moderate values of the excitation energy and four-momentum transfer.

63 citations

Journal ArticleDOI
TL;DR: In this paper, the authors apply the single quark transition model to resonance transition amplitudes extracted from photo-production and electroproduction data, and compare the predictions with data and find surprisingly good agreement.
Abstract: We apply the single quark transition model to resonance transition amplitudes extracted from photo-production and electroproduction data. We use experimental data on the ${S}_{11}(1535)$ and ${D}_{13}(1520)$ nucleon resonances to extract the amplitudes for the electromagnetic transition from the nucleon ground state $[56, {0}^{+}]$ to the $[70, {1}^{\ensuremath{-}}]$ supermultiplet, and make predictions for the transition amplitudes of all other states associated with the $[70, {1}^{\ensuremath{-}}].$ We compare the predictions with data and find surprisingly good agreement. The comparison is hampered by the poor data quality for many of the states especially in the electroproduction sector.

40 citations

Journal ArticleDOI
01 Mar 2016
TL;DR: In this article, the authors provide the exclusive γ*(n) → p+π− reaction cross section from deuterium data using the correction factor that accounts for the final state re-scattering that can be determined from the data set itself.
Abstract: The goal of our research is to provide the exclusive γ*(n) → p+π− reaction cross section from deuterium data using the correction factor that account for the final state re-scattering that can be determined from the data set itself. The “e1e” Jefferson Lab CLAS data set that we analyze includes both a hydrogen and deuterium target run period, which allows a combined analysis of pion electroproduction off the free proton, the bound proton, and the bound neutron under the same experimental conditions. Hence it will provide the experimentally best possible information about the off-shell and final state interaction effects in deuterium, which must be considered in order to extract the neutron information. This data set will provide results with a kinematic coverage for the hadronic invariant mass W up to 1.7 GeV and in the momentum transfer Q2 range of 0.4 − 1.0 GeV/c2. The cross section analysis of this data set is currently underway, which will considerably improve our knowledge of the Q2 evolution of π−p electroproduction cross sections off bound neutron needed for the extraction of excited neutron state electrocouplings for the first time.

8 citations

Journal ArticleDOI
TL;DR: In this article, differential cross-sections for the electro-production of single charged pions from deuterium for a virtual photon mass squared −1.0 GeV2 and for pion nucleon masses in the range 1.23-1.68 GeV (the 1st and 2nd resonance regions).
Abstract: We present differential cross-sections for the electro-production of single charged pions from deuterium for a virtual photon mass squared −1.0 GeV2 and for pion nucleon masses in the range 1.23–1.68 GeV (the 1st and 2nd resonance regions). The data are compared with predictions from fits to hydrogen data.

3 citations

01 Aug 2002
TL;DR: In this article, the authors apply the single quark transition model to resonance transition amplitudes extracted from photo-and electroproduction data, and compare the predictions with data and find surprisingly good agreement.
Abstract: We apply the single quark transition model to resonance transition amplitudes extracted from photo- and electroproduction data. We use experimental data on the S{sub 11}(1535), and D{sub 13}(1520) nucleon resonances to extract the amplitudes for the electromagnetic transition from the nucleon ground state [56,0+] to the [70,1-] supermultiplet, and make predictions for the transition amplitudes of all other states associated with the [70,1-]. We compare the predictions with data and find surprisingly good agreement. The comparison is hampered by the poor data quality for many of the states especially in the electroproduction sector.

1 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the imaginary parts of the invariant amplitudes for the process eN → eNπ, the real parts are calculated from fixed t dispersion relations, the complete amplitudes are then fit to the coincidence data in the resonance region (0 < |λ2| < 1.0 GeV2; w < 2 GeV) in order to determine the form factor parameters.

44 citations

Journal ArticleDOI
TL;DR: In this paper, the real parts of the amplitudes are generated entirely from their imaginary parts via d.rs., and essentially all available data is included at all energies with momentum transfer | t | 2.

38 citations

Journal ArticleDOI
TL;DR: In this paper, the rates for forward electroproduction of single charged pions from deutrium have been measured in the resonance region, at a virtual photon mass squared ≈−0.5( GeV/ c 2 ) 2.

10 citations

Journal ArticleDOI
TL;DR: In this article, the resonance excitation amplitudes of the Devenish and Lyth analysis of electroproduction were fitted within the context of the symmetric quark model and formfactors for the L = 1 and 2 multiplets, both transverse and longitudinal, were obtained.

6 citations

01 Jan 1976

3 citations