Charge asymmetry in elastic scattering of massive leptons on protons

Koshchii, Oleksandr; Afanasev, A.

doi:10.1103/physrevd.96.016005

Cited by 23 publications

(33 citation statements)

References 41 publications

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“…3 that the overall low-|Q 2 | behavior of our TPE contributions is roughly consistent with Ref. [57] SPA results which are based on the use of relativistic pointlike (Dirac) protons. Nevertheless, despite the apparent qualitative similarity, our total TPE contribution differs in magnitude roughly by about a factor of two from that in Ref.…”

Section: Resultssupporting

confidence: 90%

“…Nevertheless, despite the apparent qualitative similarity, our total TPE contribution differs in magnitude roughly by about a factor of two from that in Ref. [57]. Moreover, we note that our results substantially differ from the results of another recent TPE work, Ref.…”

Section: Resultscontrasting

confidence: 89%

“…As anticipated from recent TPE works, e.g., Refs. [19,30,57], our TPE contributions are vanishing when Q 2 becomes zero. 9 As observed in the figure, the TPE contributions for electron-proton scattering are about an order of magnitude larger than for muon-proton scattering.…”

Section: Resultsmentioning

confidence: 79%

“…The TPE results of Ref. [57], which we label as "Kosh + Afan", are compared with our evaluations in the bottom panels of Fig. 3, when we adjust their expressions to reflect our IR treatment of the TPE amplitude.…”

Section: Resultsmentioning

confidence: 99%

“…(20) in Ref. [57]), leaving out the IR singular terms which must cancel against those from soft bremsstrahlung. In our notation Eq.…”

Section: Resultsmentioning

confidence: 99%

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Lepton-proton two-photon exchange in chiral perturbation theory

et al. 2020

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We use heavy baryon chiral perturbation theory to evaluate the two-photon exchange corrections to the low-energy elastic lepton-proton scattering at next-to-leading order accuracy, i.e., O(α, M −1 ), including a non-zero lepton mass. We consider the elastic proton intermediate state in the two-photon exchange invoking soft photon approximation. The infrared singular contributions are projected out using dimensional regularization. The resulting infrared singularity-free two-photon exchange contribution is in good numerical agreement with existing predictions based on standard diagrammatic soft photon approximation evaluations.

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Section: Resultssupporting

confidence: 90%

Section: Resultscontrasting

confidence: 89%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

“…(20) in Ref. [57]), leaving out the IR singular terms which must cancel against those from soft bremsstrahlung. In our notation Eq.…”

Section: Resultsmentioning

confidence: 99%

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Lepton-proton two-photon exchange in chiral perturbation theory

et al. 2020

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Charge and spin asymmetries in elastic lepton-nucleon scattering

Koshchii¹,

Afanasev²

2018

AIP Conference Proceedings

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Elastic lepton scattering off of a nucleon has proved to be an efficient tool to study the structure of the hadron. Modern cross section and asymmetry measurements at Jefferson Lab require effects beyond the leading order Born approximation to be taken into account. Availability of unpolarized beams of both electrons and positrons in respective experiments would enable to reduce systematic uncertainties due to higher-order charge-odd contributions. In addition, information on an unpolarized electronto-positron cross section ratio could serve as a test for theoretical models that provide predictions for charge-dependent radiative corrections to elastic lepton-nucleon scattering. Availability of polarized beams of leptons would allow for even more comprehensive study of higher-order effects as some of them are dominant in polarized lepton-nucleon scattering asymmetries. We present a brief overview of effects due to the lepton's charge and target's polarization on elastic lepton-nucleon scattering measurements.

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