Fermionic electroweak NNLO corrections to e+e−→ZH with polarized beams and different renormalization schemes
【Abstract】 Recently, the next-to-next-to-leading order (NNLO) electroweak corrections with fermion loops to the Higgsstrahling process were computed. Here we present numerical results for polarized electron/positron beams, as well as for two input parameter schemes known as the α(0) and Gμ schemes. The size of the NNLO corrections strongly depends on the beam polarization, leading to an increase of the ZH cross section by 0.76% for eL+eR− beams, and a decrease of 0.04% for eR+eL− beams. Furthermore, inclusion of the NNLO corrections is found to significantly reduce the discrepancy between the results in the α(0) and Gμ schemes. Using the remaining difference, together with other methods, the theory uncertainty from missing bosonic electroweak corrections is estimated to be less than 0.3%.
【Author】 Ayres Freitas, Qian Song, Keping Xie
【Journal】 Physical Review D(IF：4.4) Time：2023-09-20