NNLO virtual and real leptonic corrections to muon-electron scattering

Budassi, Ettore; Calame, C. M. Carloni; Chiesa, Mauro; Pio, Clara Lavinia Del; Hasan, Syed Mehedi; Montagna, G.; Nicrosini, O.; Piccinini, F.

doi:10.1007/jhep11(2021)098

Cited by 24 publications

(36 citation statements)

References 93 publications

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“…Two Monte Carlo codes are available that include the dominant electron-line corrections at NNLO [35,36]. In addition, the subset of the NNLO corrections with closed (and open) fermion loops are also known [37][38][39]. Further, electroweak effects [40] and possible contaminations from physics beyond the Standard Model [41][42][43] have been studied.…”

Section: Discussionmentioning

confidence: 99%

Universal structure of radiative QED amplitudes at one loop

Engel,

Signer,

Ulrich

2021

Preprint

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We present two novel results about the universal structure of radiative QED amplitudes in the soft and in the collinear limit. On the one hand, we extend the well-known Low-Burnett-Kroll theorem to the one-loop level and give the explicit relation between the radiative and non-radiative amplitude at subleading power in the soft limit. On the other hand, we consider a factorisation formula at leading power in the limit where the emitted photon becomes collinear to a light fermion and provide the corresponding one-loop splitting function. In addition to being interesting in their own right these findings are particularly relevant in the context of fully-differential higher-order QED calculations. One of the main challenges in this regard is the numerical stability of radiative contributions in the soft and collinear regions. The results presented here allow for a stabilisation of real-virtual amplitudes in these delicate phase-space regions by switching to the corresponding approximation without the need of explicit computations.

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Section: Discussionmentioning

confidence: 99%

Universal structure of radiative QED amplitudes at one loop

Engel,

Signer,

Ulrich

2021

Preprint

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“…In the second category the displaced vertex signature arises from SM processes which are prompt, i.e. the production of the background event occurs at the target (for a recent calculation of background process at NNLO relevant to this proposed search, see [89]). Due to tracker inefficiencies, tracks in the event may reconstruct to a vertex which manifests as displaced.…”

Section: Backgroundsmentioning

confidence: 99%

Dark Photons and Displaced Vertices at the MUonE Experiment

Galon¹,

Shih²,

R.³

2022

Preprint

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MUonE is a proposed experiment designed to measure the hadronic vacuum polarization contribution to muon g − 2 through elastic µ − e scattering. As such it employs an extremely high-resolution tracking apparatus. We point out that this makes MUonE also a very promising experiment to search for displaced vertices from light, weakly-interacting new particles. We demonstrate its potential by showing how it has excellent sensitivity to dark photons in the mass range 10 MeV ≤ m A ≤ 100 MeV and kinetic mixing parameter 10 −5 ≤ e ≤ 10 −3 , through the process µ − e − → µ − e − A followed by A → e + e − .

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“…Their results have been compared and are in very good agreement. In addition, the complete NNLO corrections including a lepton pair have been calculated and implemented in the MESMER MC code [39]. Resummation of leading terms in higher orders (by parton shower and YFS exponentiation) matched to (N)NLO will be necessary and is being carried out.…”

Section: Theoretical Progressmentioning

confidence: 99%

Status of the MUonE experiment

Abbiendi

2022

Preprint

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The MUonE experiment has been proposed to measure the differential cross section of µe elastic scattering, by colliding the 160 GeV muons of the CERN M2 beam with atomic electrons of thin target plates. From a very precise measurement of the shape one can achieve a competitive determination of the leading hadronic contribution to the muon magnetic moment, independent from the other existing ones. In preparation for the Test Run with a reduced setup the detector geometry has been optimised. Expected yields for a first physics run with limited statistics are discussed, together with prospects for the assessment of the main systematic uncertainties.

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NNLO virtual and real leptonic corrections to muon-electron scattering

Cited by 24 publications

References 93 publications

Universal structure of radiative QED amplitudes at one loop

Universal structure of radiative QED amplitudes at one loop

Dark Photons and Displaced Vertices at the MUonE Experiment

Status of the MUonE experiment

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