Quasielastic neutrino scattering: A measurement of the weak nucleon axial-vector form factor

Baker, N. J.; Cnops, A.M.; Connolly, P. L.; Kahn, S.; Kirk, H.; Murtagh, M.J.; Palmer, R.B.; Samios, N.P.; Tanaka, M.

doi:10.1103/physrevd.23.2499

Cited by 189 publications

(187 citation statements)

References 22 publications

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“…[37] and in Figure 7 of Ref. [38] for the ANL and BNL experiments, respectively 13 . Muon-type-antineutrino (energy beam peaked around 1.5 GeV) induced total cross sections off the proton (neutron) for final π − p and π 0 n (π − n) channels with and without the invariant mass cut W < 1.4 GeV were measured in the Gargamelle propane experiment at CERN PS [39].…”

Section: A CC Pion Production Cross Sectionsmentioning

confidence: 99%

Weak pion production off the nucleon

2007

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We develop a model for the weak pion production off the nucleon, which besides the Delta pole mechanism (weak excitation of the ∆(1232) resonance and its subsequent decay into N π), includes also some background terms required by chiral symmetry. We re-fit the C A 5 (q 2 ) form factor to the flux averaged νµp → µ − pπ + ANL q 2 −differential cross section data, finding a substantially smaller contribution of the Delta pole mechanism than traditionally assumed in the literature. Within this scheme, we calculate several differential and integrated cross sections, including pion angular distributions, induced by neutrinos and antineutrinos and driven both by charged and neutral currents. In all cases we find that the background terms produce quite significant effects and that they lead to an overall improved description of the data, as compared to the case where only the Delta pole mechanism is considered. We also show that the interference between the Delta pole and the background terms produces parity-violating contributions to the pion angular differential cross section, which are intimately linked to T −odd correlations in the contraction between the leptonic and hadronic tensors. However, these latter correlations do not imply a genuine violation of time reversal invariance because of the existence of strong final state interaction effects.

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Section: A CC Pion Production Cross Sectionsmentioning

confidence: 99%

Weak pion production off the nucleon

2007

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“…The experimental g A (q 2 ) has been measured in neutrino-neutron scattering and pion electroproduction. The neutrino data gives a good fit in the dipole form up to q 2 = 3GeV 2 /c 2 [19], i.e. g A (q 2 ) = g A (0)/(1 − q 2 /M 2 A ) 2 , with the axial vector coupling constant g A (0) = 1.254±0.006 and M A = 1.032±0.036GeV (world average).…”

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confidence: 99%

Nucleon axial form factor from lattice QCD

et al. 1994

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Results for the isovector axial form factors of the proton from a lattice QCD calculation are presented for both point-split and local currents. They are obtained on a quenched 16 3 × 24 lattice at β = 6.0 with Wilson fermions for a range of quark masses from strange to charm. For each quark mass, we find that the axial form factor falls off slower than the corresponding proton electric form factor. Results extrapolated to the chiral limit show that the q 2 dependence of the axial form factor agrees reasonably well with experiment. The axial coupling constant g A calculated for the local and the point-split currents is about 6% and 12% smaller than the experimental value respectively.

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“…1, 2, and 3 below obtained from Refs. [8,9,10]. The distribution of muon slopes in ν µ charged current interactions is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The ratios of deep inelastic, quasi-elastic and resonance production cross-sections to the total charged current cross section used to build the MC sample are taken from [8,9,10], and are the following: f RES = 0.11 ± 0.02…”

Section: Resultsmentioning

confidence: 99%

The PEANUT experiment in the NuMI beam at Fermilab

Russo¹

2010

AIP Conference Proceedings

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Abstract. The PEANUT experiment was designed to study neutrino interactions in the few GeV range using the NuMI beam at Fermilab. The detector uses a hybrid technique, being made of nuclear emulsions and scintillator trackers. Emulsion films act as a tracking device and they are interleaved with lead plates used as neutrino targets. The detector is designed to reconstruct the topology of neutrino interactions at the single particle level. We present here the full reconstruction and analysis of a sample of 147 neutrino interactions that occurred in the PEANUT detector and the measurement of the quasielastic, resonance and deep-inelastic contributions to the total charged-current cross section. This technique could be applied for the beam monitoring at future neutrino facilities.

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Quasielastic neutrino scattering: A measurement of the weak nucleon axial-vector form factor

Cited by 189 publications

References 22 publications

Weak pion production off the nucleon

Weak pion production off the nucleon

Nucleon axial form factor from lattice QCD

The PEANUT experiment in the NuMI beam at Fermilab

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