Two-photon-exchange effects in the unpolarized 
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 scattering within a hadronic model

Zhou, Hai-Qing

doi:10.1103/physrevc.95.025203

Cited by 14 publications

(6 citation statements)

References 56 publications

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“…In addition, this calculation provides more confidence on the fact that soft photon TPE and bremsstrahlung corrections that appear to be on the order of a few tenth percent in the kinematics of MUSE are about an order of magnitude larger than helicity-flip contributions for muons, which were recently estimated in Refs. [39,40].…”

Section: Discussionmentioning

confidence: 99%

Charge asymmetry in elastic scattering of massive leptons on protons

Koshchii¹,

Afanasev²

2017

Phys. Rev. D

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The charge asymmetry due to higher-order QED corrections in elastic lepton-proton scattering is estimated without employing the ultrarelativistic approximation. Our calculation is performed by generalizing the soft-photon approximation approach suggested by Tsai. Corresponding loop integrals that take a form of Passarino-Veltman scalar three-point functions are calculated analytically without neglecting the mass of the lepton. Our results provide model-independent charge asymmetry predictions for scattering of unpolarized and massive leptons on proton targets. These predictions can be used in corresponding experiments to determine the contribution coming from model-dependent hard two-photon exchange processes.

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Section: Discussionmentioning

confidence: 99%

Charge asymmetry in elastic scattering of massive leptons on protons

Koshchii¹,

Afanasev²

2017

Phys. Rev. D

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“…The contribution from all inelastic excitations in the nearforward approximation was found [31] to be an order of magnitude smaller than the elastic contribution, which is expected at energies of MUSE below the pion-production threshold. Subsequent evaluations of the σ-meson exchange correction [54,55] as well as of the ∆-resonance TPE contribution [55] within the hadronic model of Refs. [56][57][58][59][60] confirmed the dominance of the elastic channel.…”

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confidence: 99%

Dispersion relation formalism for the two-photon exchange correction to elastic muon–proton scattering: elastic intermediate state

Tomalak¹,

Vanderhaeghen²

2018

Eur. Phys. J. C

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We evaluate the two-photon exchange correction to the unpolarized cross section in the elastic muon-proton scattering within dispersion relations. One of the six independent invariant amplitudes requires a subtraction. We fix the subtraction function to the model estimate of the full two-photon exchange at one of three MUSE beam energies and make a prediction for the two other energies. Additionally, we present single and double polarization observables accounting for the lepton mass.

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“…3, which is discussed in Refs. [33][34][35][36][37][38][39]. Meanwhile, after the loop integration, the final results can be expressed in a general form as in Fig.…”

Section: (1γ)mentioning

confidence: 99%

“…[17][18][19][20][21] and Ref. [22], and the contributions from the meson-exchange effect [33][34][35][36] are not included.…”

Section: Introduction E ± P µPmentioning

confidence: 99%

Exact relations for two-photon-exchange effect in elastic ep scattering by dispersion relation and hadronic model *

Cao¹,

Zhou²

2021

Chinese Phys. C

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The two-photon-exchange (TPE) effect plays a key role in extracting the form factors (FFs) of the proton. In this work, we discuss several exact properties of the TPE effect in the elastic scattering. By taking four low energy interactions as examples, we analyze kinematical singularities, asymptotic behaviors, and branch cuts of TPE amplitudes. The analytical expressions clearly indicate several exact relations between the dispersion relation (DR) and hadronic model (HM) methods. This suggests that the two methods must be modified to general forms, while novel forms yield the same results. After the modification, new DRs include a non-trivial term with two singularities. Furthermore, new DRs automatically include contributions due to the seagull interaction, meson-exchange effect, contact interactions, and off-shell effect. To analyze the elastic scattering data sets, the new forms must be used.

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Two-photon-exchange effects in the unpolarized μp scattering within a hadronic model

Abstract: In this work, the two-photon-exchange (TPE) effects in the unpolarized µp scatter-

Cited by 14 publications

References 56 publications

Charge asymmetry in elastic scattering of massive leptons on protons

Charge asymmetry in elastic scattering of massive leptons on protons

Dispersion relation formalism for the two-photon exchange correction to elastic muon–proton scattering: elastic intermediate state

Exact relations for two-photon-exchange effect in elastic ep scattering by dispersion relation and hadronic model *

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