0000000001306989

AUTHOR

P.a.m. Guichon

showing 5 related works from this author

The first Virtual Compton Scattering experiment at MAMI

1999

Abstract Virtual Compton scattering, i.e. the exclusive reaction γ ∗ p → γ′p′ with γ ∗ denoting a virtual photon, provides new insights on the internal structure of the proton. Below π 0 production threshold, this experiment measures the generalized polarizabilities of the proton as defined by Guichon et al [1], [2] and Drechsel et al [3]. These new electromagnetic observables, functions of Q 2 , enlarge the concept of electric (α0 and magnetic (β) polarizabilities in Real Compton Scattering ( Q 2 =0) [4]. The first VCS experiment [5] of this kind was measured at the three spectrometer facility at the Mainz Microtron MAMI for Q 2 =0.33 GeV 2 and we present in this paper the preliminary resu…

PhysicsNuclear and High Energy Physics[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]ProtonSpectrometer010308 nuclear & particles physicsCompton scatteringVirtual particleObservable01 natural sciences7. Clean energyNuclear physics0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment010306 general physicsMicrotron
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Virtual Compton Scattering and polarizabilities

1999

Abstract Virtual Compton Scattering (VCS) off the proton below pion threshold allows access to generalized polarizabilities of the proton. These observables measure the response of the nucleon to low energy electromagnetic field perturbations. This paper presents a comparison with Real Compton Scattering and also results for the first dedicated VCS experiment performed at the Mainz Microtron MAMI with high resolution spectrometers at Q2 = 0.33 GeV2.

Electromagnetic fieldPhysicsNuclear and High Energy PhysicsParticle physicsProton010308 nuclear & particles physicsNuclear TheoryCompton scatteringMeasure (physics)Observable01 natural sciencesNuclear physicsPion0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsNucleonNuclear ExperimentMicrotron
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The first dedicated Virtual Compton Scattering experiment at MAMI

1999

We measured the absolute cross sections for photon electro-production off the proton, ep to ep gamma , with the high resolution spectrometers at MAMI at momentum transfer q=600 MeV/c and photon polarization epsilon =0.62. We covered the momentum range for the outgoing real photon q'=33/111 MeV/c. From the extracted virtual Compton scattering amplitude we deduce values for two structure functions related to the generalized polarizabilities of the proton.

PhysicsNuclear and High Energy PhysicsPhotonProtonSpectrometer010308 nuclear & particles physicsMomentum transferCompton scattering01 natural sciencesNuclear physicsMomentumAmplitude0103 physical sciencesPhoton polarization[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment010306 general physics
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Virtual compton scattering under π0 threshold at Q2=0.33 GeV2. Preliminary results

1999

We have measured the absolute unpolarized cross sections for photon electro-production off the proton ep → epγ with the Three-Spectrometer-Setup at MAMI at a momentum transfer q=600 MeV/c and a virtual photon polarization ɛ=0.62. The momentum q ′ of the outgoing real photon range from 33 to 111 MeV/c. We extracted two combinations of the recently introduced generalized polarizabilities [1,2].

PhysicsMassless particleNuclear reactionElastic scatteringNuclear physicsNuclear and High Energy PhysicsPhotonScatteringMomentum transferCompton scatteringVirtual particleAtomic physicsNuclear ExperimentNuclear Physics A
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"Table 1" of "Virtual Compton scattering under pi0 threshold at Q**2 = 0.33-GeV**2: Preliminary results."

1999

No description provided.

POLPhotoproductionPolarizationExclusiveGAMMA* P --> P GAMMA0.0
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