Low-energy doubly virtual Compton scattering from dilepton electroproduction on a nucleon

Pauk, Vladyslav; Carlson, Carl E.; Vanderhaeghen, Marc

doi:10.1103/physrevc.102.035201

Cited by 9 publications

(11 citation statements)

References 36 publications

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“…For the near-forward real Compton cross section (i.e. integrated over dilepton phase space), it was found that around W = 1.25 GeV the Born + ∆(1232)-pole contribution reproduces a full dispersive calculation based on empirical structure functions within an accuracy of 5% or better [21]. As we consider in this work kinematics around the ∆(1232) resonance, we will study as a first step the effect due to radiative corrections on the ∆(1232)-pole contribution.…”

Section: ∆-Pole Modelmentioning

confidence: 99%

“…The resulting uncertainty due to this subtraction term constitutes at present the main uncertainty in the theoretical µH Lamb shift estimate. To reduce such model dependence, the dilepton electroproduction process on a proton has been proposed in [21] as an empirical way to determine T 1 (0).…”

Section: Low-energy Expansionmentioning

confidence: 99%

“…In Ref. [21] it was proposed to access this low-energy nucleon structure constant empirically through the forward-backward asymmetry in the e − p → e − p l − l + process, with l = e or l = µ. The dVCS amplitude contributing to that process, γ * p → γ * p, has an incoming photon with space-like virtuality and an outgoing photon with time-like virtuality.…”

Section: Introductionmentioning

confidence: 99%

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Soft-photon radiative corrections to the $e^- p \to e^- p l^- l^+$ process

Heller,

Keil,

Vanderhaeghen

2021

Preprint

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We calculate the leading-order QED radiative corrections to the process e − p → e − pl − l + in the soft-photon approximation, in two different energy regimes which are of relevance to extract nucleon structure information. In the low-energy region, this process is studied to better constrain the hadronic corrections to precision muonic Hydrogen spectroscopy. In the high-energy region, the beam-spin asymmetry for double virtual Compton scattering allows to directly access the Generalized Parton Distributions. We find that the soft-photon radiative corrections have a large impact on the cross sections and are therefore of paramount importance to extract the nucleon structure information from this process. For the forward-backward asymmetry the radiative corrections are found to affect the asymmetry only around or below the 1% level, whereas the beam-spin asymmetry is not affected at all in the soft-photon approximation, which makes them gold-plated observables to extract nucleon structure information in both the low-and high-energy regimes.

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Section: ∆-Pole Modelmentioning

confidence: 99%

Section: Low-energy Expansionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soft-photon radiative corrections to the $e^- p \to e^- p l^- l^+$ process

Heller,

Keil,

Vanderhaeghen

2021

Preprint

Self Cite

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“…For these methods, the TPE correction is usually divided into Born and non-Born pieces, where the Born part is well-constrained by the experimental data, but the non-Born part contains a subtraction function, which is poorly constrained and relies on model, thus leading to a large systematic uncertainty. It is proposed recently that the subtraction function can be further constrained by the dilepton electroproduction [22]. To date, the theoretical results of the TPE correction ∆E TPE are summarized in Fig.…”

Section: Introductionmentioning

confidence: 99%

Lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift

Fu,

Feng,

Jin

et al. 2022

Preprint

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We develop a method for lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift. To demonstrate its feasibility, we present the first lattice calculation with a gauge ensemble at mπ = 142 MeV. By adopting the infinite-volume reconstruction method along with an optimized subtraction scheme, we obtain ∆E TPE = −28.9(4.9) µeV + 93.72 µeV fm 2 ⋅ ⟨r 2 p ⟩, or ∆E TPE = 37.4(4.9) µeV, which is consistent with the previous theoretical results in a range of 20-50 µeV.

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“…Other theoretical approaches are usually devoted to improve the determination of the non-Born contribution, in particular the contribution of subtraction function. It has also been recently proposed that the subtraction function can be further constrained by the dilepton electroproduction [18].…”

Section: Introductionmentioning

confidence: 99%

Lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift

Fu¹

2021

Preprint

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We develop a method for lattice QCD calculation of the two-photon exchange (TPE) contribution to the muonic-hydrogen Lamb shift. To demonstrate the feasibility of this method, We also present an exploratory study with a gauge ensemble at 𝑚 𝜋 = 142 MeV. By adopting the infinite-volume reconstruction (IVR) method along with an optimized subtraction scheme, we obtain a preliminary result of the TPE contribution which agrees well with previous calculation using other methods and one magnitude smaller compare to the large ∼ 300 𝜇eV discrepancy for the proton radius puzzle.

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Low-energy doubly virtual Compton scattering from dilepton electroproduction on a nucleon

Cited by 9 publications

References 36 publications

Soft-photon radiative corrections to the $e^- p \to e^- p l^- l^+$ process

Soft-photon radiative corrections to the $e^- p \to e^- p l^- l^+$ process

Lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift

Lattice QCD calculation of the two-photon exchange contribution to the muonic-hydrogen Lamb shift

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