A measurement of the axial form factor of the nucleon by the p(e,e'pi+)n reaction at W=1125 MeV

Abstract

The reaction p(e,e'pi+)n was measured at the Mainz Microtron MAMI at an invariant mass of W=1125 MeV and four-momentum transfers of Q^2=0.117, 0.195 and 0.273 (GeV/c)^2. For each value of Q^2, a Rosenbluth separation of the transverse and longitudinal cross sections was performed. An effective Lagrangian model was used to extract the `axial mass' from experimental data. We find a value of M_A=(1.077+-0.039) GeV which is (0.051+-0.044) GeV larger than the axial mass known from neutrino scattering experiments. This is consistent with recent calculations in chiral perturbation theory.

14 pages, 5 figures, uses elsart.cls

References in corpus (3)

• Updated resonance photo-decay amplitudes to 2 GeV
• Multipole analysis of pion photoproduction based on fixed t dispersion relations and unitarity
• The Gerasimov-Drell-Hearn sum rule and the single-pion photoproduction multipole E0+ close to threshold

Cited by in corpus (75)

• Axial structure of the nucleon
• Three-pion contribution to hadronic vacuum polarization
• Inclusive Charged--Current Neutrino--Nucleus Reactions
• NuSTEC White Paper: Status and Challenges of Neutrino-Nucleus Scattering
• Nucleon Form Factors in QCD
• Progress and open questions in the physics of neutrino cross sections
• Neutrino Reactions on Deuteron
• Parity Violation in Elastic Electron-Proton Scattering and the Proton's Strange Magnetic Form Factor
• Model independent determination of the axial mass parameter in quasielastic neutrino-nucleon scattering
• Induced pseudoscalar coupling of the proton weak interaction
• Nucleon axial form factors using lattice QCD simulations with a physical value of the pion mass
• The SAMPLE Experiment and Weak Nucleon Structure
• Axial, induced pseudoscalar, and pion-nucleon form factors in manifestly Lorentz-invariant chiral perturbation theory
• Quasielastic axial-vector mass from experiments on neutrino-nucleus scattering
• Nucleon axial structure from lattice QCD
• Nucleon Axial Radius and Muonic Hydrogen - A New Analysis and Review
• Iso-vector axial form factors of the nucleon in two-flavour lattice QCD
• Lattice QCD and Neutrino-Nucleus Scattering
• Multinucleon ejection model for Meson Exchange Current neutrino interactions
• Measurement of the ${\nu }_{\mu }$ CCQE cross section on carbon with the ND280 detector at T2K
• Solving the PCAC puzzle for nucleon axial and pseudoscalar form factors
• On extraction of value of axial mass from MiniBooNE neutrino quasi-elastic double differential cross section data
• Distribution amplitudes of $\Sigma$ and $\Lambda$ and their electromagnetic form factors
• Determination of the strange form factors of the nucleon from $\nu p$, $\bar{\nu }p$, and parity-violating $\vec{e}p$ elastic scattering
• Covariant axial form factor of the nucleon in a chiral constituent quark model
• The branching ratio $\omega \to {\pi }^{+}{\pi }^{-}$ revisited
• Understanding $B\to D^{\ast -}N\bar{N}$ and Its Implications
• Chiral Perturbation Theory: Introduction and Recent Results in the One-Nucleon Sector
• Hadron structure at low Q^2
• Extraction of nucleon axial charge and radius from lattice QCD results using baryon chiral perturbation theory
• Axial-vector form factors of the nucleon within the chiral quark-soliton model and their strange components
• Nucleon Form Factors of the Isovector Axial-Vector Current: Situation of Experiments and Theory
• Induced pseudoscalar form factor of the nucleon at two-loop order in chiral perturbation theory
• The size of the pion from full lattice QCD with physical $u$, $d$, $s$ and $c$ quarks
• New anomalous trajectory in Regge theory
• Axial-vector dominance predictions in quasielastic neutrino-nucleus scattering
• Pion electroproduction, PCAC, chiral Ward identities, and the axial form factor revisited
• Electromagnetic form factors of the pion and kaon from the instanton vacuum
• Pion Valence Quark Distributions from Maximum Entropy Method
• Form Factors of the Nucleon Axial Current
• Axial-vector form factors for the low lying octet baryons in the chiral quark constituent model
• Hadron structure and the limitations of phenomenological models in electromagnetic reactions
• Neutral-Current Atmospheric Neutrino Flux Measurement Using Neutrino-Proton Elastic Scattering in Super-Kamiokande
• Axial vector form factor of nucleons in a light-cone diquark model
• Partial conservation of the axial current and axial exchange currents in the nucleon
• Light-cone QCD Sum Rules for the $\Lambda$ Baryon Electromagnetic Form Factors and its magnetic moment
• The pion charge radius from charged pion electroproduction
• Invariant Amplitudes for Pion Electroproduction
• Deuteron binding energies and form factors from light front field theory
• Role of $\sigma$ exchange in the $\gamma p\to \varphi p$ process and scaling with the $f_1$ axial vector meson from a Reggeized model
• Axial and pseudoscalar form factors from charged current quasielastic neutrino-nucleon scattering
• Axial amplitudes for Delta excitation in chiral quark models
• Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory
• Chiral perturbation theory - Success and challenge
• Pion photo- and electroproduction and the partially-conserved axial current
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Axial-vector form factors of the baryon decuplet with flavor SU(3) symmetry breaking
• DIS structure functions and the double-spin asymmetry in ${\rho }^0$ electroproduction within a Regge approach
• Muon Capture in Deuterium
• Quark model description of quasi-elastic pion knockout from the proton at JLAB
• Features of $\omega$ photoproduction off nucleon target at forward angles : Dominance of $\pi$ exchange with Regge cuts and scaling of differential cross sections
• Precision analysis of pseudoscalar interactions in neutron beta decays
• A polarization relation and the measurement of the longitudinal response in pseudoscalar meson electroproduction off the nucleon
• Relativistic energy-momentum tensor distributions in a polarized nucleon
• An update of muon capture on hydrogen
• Connected and disconnected contributions to nucleon axial form factors using $N_f=2$ twisted mass fermions at the physical point
• Measurement of the $p(e,e^{\prime }{\pi }^{+})n$ reaction close to threshold and at low $Q^2$
• On the pion electroproduction amplitude
• Breit type equation for mesonic atoms
• Theoretical description of the neutron beta decay in the standard model at the level of 10^{-5}
• A dispersive approach to pion photo- and electroproduction
• The standing wave model of the mesons and baryons
• Corrections of order O(E^2_e/m^2_N), caused by weak magnetism and proton recoil, to the neutron lifetime and correlation coefficients of the neutron beta decay
• Can we extract the pion electromagnetic form factor from a t-channel diagram only?
• Study of vector and axial-vector form factors and the decay parameters for the semileptonic hyperon decays