Outputs (8)

Radiative corrections: from medium to high energy experiments (2024)
Journal Article
Afanasev, A., Bernauer, J. C., Blunden, P., Blümlein, J., Cline, E. W., Friedrich, J. M., Hagelstein, F., Husek, T., Kohl, M., Myhrer, F., Paz, G., Schadmand, S., Schmidt, A., Sharkovska, V., Signer, A., Tomalak, O., Tomasi-Gustafsson, E., Ulrich, Y., & Vanderhaeghen, M. (2024). Radiative corrections: from medium to high energy experiments. The European Physical Journal A, 60(4), Article 91. https://doi.org/10.1140/epja/s10050-024-01281-y

Radiative corrections are crucial for modern high-precision physics experiments, and are an area of active research in the experimental and theoretical community. Here we provide an overview of the state of the field of radiative corrections with a f... Read More about Radiative corrections: from medium to high energy experiments.

Impact of NNLO QED corrections on lepton-proton scattering at MUSE (2023)
Journal Article
Engel, T., Hagelstein, F., Rocco, M., Sharkovska, V., Signer, A., & Ulrich, Y. (2023). Impact of NNLO QED corrections on lepton-proton scattering at MUSE. The European Physical Journal A, 59(11), 253. https://doi.org/10.1140/epja/s10050-023-01153-x

We present the complete next-to-next-to-leading order (NNLO) pure pointlike QED corrections to lepton-proton scattering, including three-photon-exchange contributions, and investigate their impact in the case of the MUSE experiment. These corrections... Read More about Impact of NNLO QED corrections on lepton-proton scattering at MUSE.

Lepton pair production at NNLO in QED with EW effects (2023)
Journal Article
Kollatzsch, S., & Ulrich, Y. (2023). Lepton pair production at NNLO in QED with EW effects. SciPost Physics, 15(3), Article 104. https://doi.org/10.21468/scipostphys.15.3.104

We present a fully differential calculation of lepton pair production, taking into account the dominant next-to-next-to-leading order QED corrections as well as next-to-leading order electroweak and polarisation effects. We include all lepton masses,... Read More about Lepton pair production at NNLO in QED with EW effects.

High-precision muon decay predictions for ALP searches (2023)
Journal Article
Banerjee, P., Coutinho, A., Engel, T., Gurgone, A., Signer, A., & Ulrich, Y. (2023). High-precision muon decay predictions for ALP searches. SciPost Physics, 15(1), Article 021. https://doi.org/10.21468/scipostphys.15.1.021

We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay μ+→e+νe¯νμ. In addition to the full next-to-next-to-leading order correction of order α2 in the electromagnetic coupling, we include logarith... Read More about High-precision muon decay predictions for ALP searches.

Muon-electron scattering at NNLO (2023)
Journal Article
Broggio, A., Engel, T., Ferroglia, A., Mandal, M., Mastrolia, P., Rocco, M., Ronca, J., Signer, A., Torres Bobadilla, W., Ulrich, Y., & Zoller, M. (2023). Muon-electron scattering at NNLO. Journal of High Energy Physics, 2023, Article 112 (2023). https://doi.org/10.1007/jhep01%282023%29112

We present the first calculation of the complete set of NNLO QED corrections for muon-electron scattering. This includes leptonic, non-perturbative hadronic, and photonic contributions. All fermionic corrections as well as the photonic subset that on... Read More about Muon-electron scattering at NNLO.

Universal structure of radiative QED amplitudes at one loop (2022)
Journal Article
Engel, T., Signer, A., & Ulrich, Y. (2022). Universal structure of radiative QED amplitudes at one loop. Journal of High Energy Physics, 2022(4), Article 97. https://doi.org/10.1007/jhep04%282022%29097

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 be... Read More about Universal structure of radiative QED amplitudes at one loop.

Møller scattering at NNLO (2022)
Journal Article
Banerjee, P., Engel, T., Schalch, N., Signer, A., & Ulrich, Y. (2022). Møller scattering at NNLO. Physical Review D, 105(3), https://doi.org/10.1103/physrevd.105.l031904

We present a calculation of the full set of next-to-next-to-leading-order QED corrections to unpolarized Møller scattering. This encompasses photonic, leptonic, and nonperturbative hadronic corrections and includes electron mass effects as well as ha... Read More about Møller scattering at NNLO.

Bhabha scattering at NNLO with next-to-soft stabilisation (2021)
Journal Article
Banerjee, P., Engel, T., Schalch, N., Signer, A., & Ulrich, Y. (2021). Bhabha scattering at NNLO with next-to-soft stabilisation. Physics Letters B, 820, https://doi.org/10.1016/j.physletb.2021.136547

A critical subject in fully differential QED calculations originates from numerical instabilities due to small fermion masses that act as regulators of collinear singularities. At next-to-next-to-leading order (NNLO) a major challenge is therefore to... Read More about Bhabha scattering at NNLO with next-to-soft stabilisation.