0000000001301190

AUTHOR

R. Boehm

showing 8 related works from this author

Lowest- Q2 measurement of the γp → Δ reaction: Probing the pionic contribution

2006

To determine nonspherical angular momentum amplitudes in hadrons at long ranges (low Q^2), data were taken for the p(\vec{e},e'p)\pi^0 reaction in the Delta region at Q^2=0.060 (GeV/c)^2 utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The results for the dominant transition magnetic dipole amplitude and the quadrupole to dipole ratios at W=1232 MeV are: M_{1+}^{3/2} = (40.33 +/- 0.63_{stat+syst} +/- 0.61_{model}) (10^{-3}/m_{\pi^+}),Re(E_{1+}^{3/2}/M_{1+}^{3/2}) = (-2.28 +/- 0.29_{stat+syst} +/- 0.20_{model})%, and Re(S_{1+}^{3/2}/M_{1+}^{3/2}) = (-4.81 +/- 0.27_{stat+syst} +/- 0.26_{model})%. These disagree with predictions of constituent quark models but are in reaso…

PhysicsDipoleAngular momentumNuclear and High Energy PhysicsPionHadronQuadrupoleLattice (group)Constituent quarkHigh Energy Physics::ExperimentAtomic physicsNuclear ExperimentMagnetic dipoleThe European Physical Journal A
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"Table 1" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Measured value of SIG(C=T) + EPS*SIG(C=L) as a function of the pion angle relative to the virtual photon direction.

ComputingMilieux_THECOMPUTINGPROFESSIONElectron productionNuclear TheoryIntegrated Cross SectionComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONCross SectionSIGInformationSystems_MODELSANDPRINCIPLES7.950E-017.950E-01E- P --> E- PI0 PExclusiveInformationSystems_MISCELLANEOUS1.221ComputingMethodologies_COMPUTERGRAPHICSComputer Science::Cryptography and Security
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"Table 5" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Unpolarized cross sections as a function of the azimuthal pion angle relative to the virtual photon direction from which the extracted results were taken (to be published).

Electron production7.950E-017.950E-01Integrated Cross SectionE- P --> E- PI0 PExclusiveCross SectionNuclear ExperimentSIG1.221
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"Table 3" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Measured value of SIG(C=LT) as a function of the pion angle relative to thevirtual photon direction.

Electron productionNuclear Theory7.950E-017.950E-01Integrated Cross SectionE- P --> E- PI0 PExclusiveCross SectionNuclear ExperimentSIG1.221Computer Science::Cryptography and Security
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"Table 4" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Measured value of SIG(C=LTP) as a function of the pion angle relative to the virtual photon direction.

Quantitative Biology::Neurons and CognitionElectron productionQuantitative Biology::Molecular NetworksNuclear TheoryIntegrated Cross SectionComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONCross SectionSIG7.950E-017.950E-01E- P --> E- PI0 PExclusiveNuclear Experiment1.221ComputingMethodologies_COMPUTERGRAPHICSComputer Science::Cryptography and Security
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"Table 2" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Measured value of SIG(C=TT) as a function of the pion angle relative to thevirtual photon direction.

Electron productionNuclear Theory7.950E-017.950E-01Integrated Cross SectionE- P --> E- PI0 PExclusiveCross SectionNuclear ExperimentSIG1.221Computer Science::Cryptography and Security
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"Table 7" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Unpolarized cross sections as a function of the azimuthal pion angle relative to the virtual photon direction from which the extracted results were taken (to be published).

Electron production7.950E-017.950E-01Integrated Cross SectionE- P --> E- PI0 PExclusiveCross SectionNuclear ExperimentSIG1.221
researchProduct

"Table 6" of "Lowest Q**2 measurement of the gamma* p --> delta reaction: Probing the pionic contribution."

2006

Unpolarized cross sections as a function of the azimuthal pion angle relative to the virtual photon direction from which the extracted results were taken (to be published).

Electron production7.950E-017.950E-01Integrated Cross SectionE- P --> E- PI0 PExclusiveCross SectionNuclear ExperimentSIG1.221
researchProduct