Virtual Compton Scattering measurements in the ${\gamma }^{\ast }N\to \Delta$ transition

Abstract

We report on new H$(e,e^{\prime }p)\gamma$ measurements in the $\Delta (1232)$ resonance at $Q^2=0.06$ (GeV/c) carried out simultaneously with H$(e,e^{\prime }p){\pi }^0$. It is the lowest $Q^2$ for which the virtual Compton scattering (VCS) reaction has been studied in the first resonance region. The VCS measured cross sections are well described by dispersion-relation calculations in which the multipole amplitudes derived from H$(e,e^{\prime }p){\pi }^0$ data are used as input, thus confirming the compatibility of the results. The derived resonant magnetic dipole amplitude $M_{1+}^{3/2}=(40.60\pm 0.70_{stat+sys})(10^{-3}/m_{{\pi }^{+}})$ at $W=$ 1232 MeV is in excellent agreement with the value extracted from H$(e,e^{\prime }p){\pi }^0$ measurements.

4 pages, 4 figures

References in corpus (36)

• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Electromagnetic excitation of the Delta(1232)-resonance
• Dispersion relations in real and virtual Compton scattering
• Analysis of Pion Photoproduction Data
• Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions
• Electroproduction of the Delta Resonance at High Momentum Transfer
• Pion cloud and the $Q^2-$dependence of ${\gamma }^{\ast }N\leftrightarrow \Delta$ transition form factors
• QED radiative corrections to virtual Compton scattering
• Determination of the E2/M1 Ratio in the γN \to Δ(1232) Transition from a Simultaneous Measurement of p(\vecγ,p)π^0 and p(\vecγ,π^+)n
• Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)
• Investigation of the conjectured nucleon deformation at low momentum transfer
• Measurement of the N to Delta(1232) Transition at High Momentum Transfer by pi0 Electroproduction
• The N to Delta electromagnetic transition form factors from Lattice QCD
• Chiral Effective-Field Theory in the Delta(1232) Region: Pion Electroproduction on the Nucleon
• Measurement of the recoil polarization in the p (\vec e, e' \vec p) pi^0 reaction at the Δ(1232) resonance
• The nucleon to Delta electromagnetic transition form factors in lattice QCD
• Electromagnetic Nucleon-to-Delta Transition in Chiral Effective-Field Theory
• The first determination of Generalized Polarizabilities of the proton by a Virtual Compton Scattering experiment
• Pi0 photo- and electroproduction at threshold within a dynamical model
• Recoil Polarization for Delta Excitation in Pion Electroproduction
• Dispersion relation formalism for virtual Compton scattering off the proton
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }p){\pi }^o$ in the $\Delta (1232)$ Resonance Region
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }{\pi }^{+})n$ in the $\Delta (1232)$ Resonance Region
• Measurement of the LT-asymmetry in π^0 electroproduction at the energy of the Δ(1232) resonance
• Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi_0 reaction at the energy of the Delta(1232) resonance
• Determination of quadrupole strengths in the gamma*p-->Delta(1232) transition at Q2= 0.20 (GeV/c)2
• Measurement of the Transverse-Longitudinal Cross Sections in the p (e,e'p)pi0 Reaction in the Delta Region
• N to Delta electromagnetic transition form factors from Lattice QCD
• Measurement of the Generalized Polarizabilities of the Proton in Virtual Scattering at Q2=0.92 and 1.76 GeV2: I. Low Energy Expansion Analysis
• Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering at Q2= 0.92 and 1.76 GeV2
• Measurements of the Generalized Electric and Magnetic Polarizabilities of the Proton at Low Q2 Using the VCS Reaction
• Recoil Polarization Measurements for Neutral Pion Electroproduction at Q^2=1 (GeV/c)^2 Near the Delta Resonance
• Ovrview: The Shape of Hadrons
• Measurement of the R${}_{LT}$ response function for ${\pi }^0$ electroproduction at $Q^2$ = 0.070 (GeV/c)${}^2$ in the $N\to \Delta$ transition}
• Beam-helicity asymmetry in photon and pion electroproduction in the Delta(1232) resonance region at Q^2= 0.35 (GeV/c)^2

Cited by in corpus (13)

• Search for Neutrino-Induced Neutral Current $\Delta$ Radiative Decay in MicroBooNE and a First Test of the MiniBooNE Low Energy Excess Under a Single-Photon Hypothesis
• Measurements of the gamma*p->Delta Reaction At Low Q^2: Probing the Mesonic Contribution
• Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2
• Electroexcitation of the ${\Delta }^{+}(1232)$ at low momentum transfer
• Real and Virtual Compton Scattering: the nucleon polarisabilities
• Virtual Compton Scattering measurements in the nucleon resonance region
• Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$
• Virtual Compton scattering at low energies with a positron beam
• Gauge- and point-invariant vertices of nucleon-to-resonance interactions
• Low-Q^2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition
• Measurement of the Partial Cross Sections s(TT), s(LT) and [s(T)+epsilon*s(L)] of the p(e,e' pi+)n Reaction in the Delta(1232) Resonance
• Resonance Contributions to Radiative Corrections in Charged-Current Elastic (Anti)Neutrino-Nucleon Scattering at GeV Energies
• Virtual Compton Scattering and Neutral Pion Electroproduction in the Resonance Region up to the Deep Inelastic Region at Backward Angles