Parity violation in elastic electron–nucleon scattering: Strangeness content in the nucleon

González-Jiménez, R.; Caballero, J. A.; Donnelly, T. W.

doi:10.1016/j.physrep.2012.10.003

Cited by 47 publications

(138 citation statements)

References 154 publications

(221 reference statements)

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“…The general structure of the hadronic electroweak currents at quark level, along with isospin symmetry allow to relate the WNC, EM and CC form factors with each other (see, for instance, Section 3 in Ref. [99] for details). In this case, since the excitation of the Delta resonance is a purely isovector transition, the form factors that parameterize the nucleon-Delta transition vertex are the same for CC and EM interactions.…”

Section: Spin-3/2 Resonancesmentioning

confidence: 99%

Electroweak single-pion production off the nucleon: From threshold to high invariant masses

et al. 2017

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Background: Neutrino-induced single-pion production (SPP) provides an important contribution to neutrino-nucleus interactions, ranging from intermediate to high energies. There exists a good number of low-energy models in the literature to describe the neutrinoproduction of pions in the region around the Delta resonance. Those models consider only lowest-order interaction terms and, therefore, fail in the high-energy region (pion-nucleon invariant masses, W 2 GeV).Purpose: Our goal is to develop a model for electroweak SPP off the nucleon, which is applicable to the entire energy range of interest for present and future accelerator-based neutrino-oscillation experiments.Method: We start with the low-energy model of Ref.[1], which includes resonant contributions and background terms derived from the pion-nucleon Lagrangian of chiral-perturbation theory [2]. Then, from the background contributions, we build a high-energy model using a Regge approach. The low-and highenergy models are combined, in a phenomenological way, into a hybrid model. Results:The Hybrid model is identical to the low-energy model in the low-W region, but, for W > 2 GeV, it implements the desired high-energy behavior dictated by Regge theory. We have tested the high-energy model by comparing with one-pion production data from electron and neutrino reactions. The Hybrid model is compared with electron-proton scattering data, with neutrino SPP data and with the predictions of the NuWro Monte Carlo event generator. Conclusions: Our model is able to provide satisfactory predictions of the electroweak one-pion production cross section from pion threshold to high W . Further investigation and more data are needed to better understand the mechanisms playing a role in the electroweak SPP process in the high-W region, in particular, those involving the axial current contributions.

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Section: Spin-3/2 Resonancesmentioning

confidence: 99%

Electroweak single-pion production off the nucleon: From threshold to high invariant masses

et al. 2017

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“…This subject was investigated in detail in [8]. Here our interest is focused on the analysis of PVQE electron-nucleus scattering.…”

Section: A Wnc Nucleon Form Factorsmentioning

confidence: 99%

“…In this work we make use of the results given in [8]: ρ s = 0.59 ± 0.62 and µ s = −0.02 ± 0.21. Notice that the previous uncertainties are much larger than the ones shown in [8] but consistent with those shown in [9]. This is due to the particular procedure considered in their evaluation.…”

Section: (S)mentioning

confidence: 99%

“…Although the results presented in this section correspond to 16 O, we have checked that the discussion follows similar trends in the case of other nuclei such as 12 C and 40 Ca. In this work we use the GKex prescription to describe the behavior of G p,n E,M , whereas for the WNC form factors we make use of the results obtained in [8], also briefly summarized in Sect. II A.…”

Section: Nucleon Structure: Wnc Form Factorsmentioning

confidence: 99%

“…This aspect of the problem was already suggested in some previous works [4][5][6][7], and it can complement the whole set of information provided by the analysis of parity violation in elastic electron-proton scattering. This latter process was studied in detail in [8][9][10] with emphasis on the vector strange form factors of the nucleon and the effects linked to the radiative corrections. These ingredients also play a role in the case of QE electron scattering.…”

Section: Introductionmentioning

confidence: 99%

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Parity violation in quasielastic electron-nucleus scattering within the relativistic impulse approximation

2015

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We study parity violation in quasielastic (QE) electron-nucleus scattering using the relativistic impulse approximation. Different fully relativistic approaches have been considered to estimate the effects associated with the final-state interactions. We have computed the parity-violating quasielastic (PVQE) asymmetry and have analyzed its sensitivity to the different ingredients that enter in the description of the reaction mechanism: final-state interactions, nucleon off-shellness effects, current gauge ambiguities. Particular attention has been paid to the description of the weak neutral current form factors. The PVQE asymmetry is proven to be an excellent observable when the goal is to get precise information on the axial-vector sector of the weak neutral current. Specifically, from measurements of the asymmetry at backward scattering angles good knowledge of the radiative corrections entering in the isovector axial-vector sector can be gained. Finally, scaling properties shown by the interference γ − Z nuclear responses are also analyzed.

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Parity violation in electron scattering

Souder

Paschke

2015

Front. Phys.

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By comparing the cross sections for left-and right-handed electrons scattered from various unpolarized nuclear targets, the small parity-violating asymmetry can be measured. These asymmetry data probe a wide variety of important topics, including searches for new fundamental interactions and important features of nuclear structure that cannot be studied with other probes. A special feature of these experiments is that the results are interpreted with remarkably few theoretical uncertainties, which justifies pushing the experiments to the highest possible precision. To measure the small asymmetries accurately, a number of novel experimental techniques have been developed.

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Parity violation in elastic electron–nucleon scattering: Strangeness content in the nucleon

Cited by 47 publications

References 154 publications

Electroweak single-pion production off the nucleon: From threshold to high invariant masses

Electroweak single-pion production off the nucleon: From threshold to high invariant masses

Parity violation in quasielastic electron-nucleus scattering within the relativistic impulse approximation

Parity violation in electron scattering

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