Orateurs
Description
With a large momentum transfer, high energy lepton-hadron scattering induces both QED and QCD radiations. Contribution of induced QCD radiation to scattering cross sections has been consistently evaluated in terms of QCD factorization approach, while contribution from induced QED radiation has been historically corrected by imposing a “radiative correction factor” to the lowest order (LO) cross section in QED coupling. The “correction” for the simple inclusive deep inelastic scattering (DIS) cross section could be as large as the value of LO cross section to be corrected in some kinematic regime. For observables with more final-state particles, e.g., semi-inclusive DIS, the single “correction” factor cannot account for full impact of QED radiation to the rich structure of the final-state. Recently, a joint QED and QCD factorization approach to evaluate high energy lepton-hadron scattering cross section was proposed to treat both QED and QCD induced radiation equally [1,2]. In this talk, we will present the first calculation of next-to-leading order (NLO) QED contributions to the factorized short-distance hard scattering coefficients to clearly demonstrate how the joint factorization consistently factorize all perturbative collinear sensitivities of partonic scattering into corresponding universal lepton and hadron distributions without the need of any parameters other than the standard factorization scale. We also discuss the impact of this joint factorization approach on the precision of parity-violating DIS and its reach for physics beyond the standard model.
[1] T. Liu, W. Melnitchouk, J.W. Qiu and N. Sato,
“A new approach to semi-inclusive deep-inelastic scattering with QED and QCD factorization,'' JHEP 11, 157 (2021) [arXiv:2108.13371 [hep-ph]].
[2] T. Liu, W. Melnitchouk, J.W. Qiu and N. Sato,
“Factorized approach to radiative corrections for inelastic lepton-hadron collisions,'' Phys. Rev. D104, 094033 (2021) [arXiv:2008.02895 [hep-ph]].
