NLO radiative corrections for forwardbackward and leftright asymmetries at a B factory
Abstract
This paper presents the first calculations of the parityviolating polarization asymmetry and forwardbackward asymmetry of the e^{+}e^{}→μ^{+}μ^{}(γ ) process at a centerofmass energy of 10.579 GeV with up to oneloop electroweak radiative corrections. The calculations are relevant for future precision electroweak measurements at the Belle II experiment, which is now collecting data at the SuperKEKB e^{+}e^{} collider with a centerofmass energy at the mass of the ϒ (4 S ) resonance. In this paper we take under full control the bremsstrahlung process at the conditions of Belle II/SuperKEKB, and the possibilities for a soft photon approach are discussed. The scale of the obtained relative corrections to the parityviolating and forwardbackward asymmetries is significant and the scattering angle dependencies of the asymmetries is nontrivial. As an additional validation crosscheck using an independent formulation, the calculated asymmetries are compared to results from the K K Monte Carlo generator.
 Publication:

Physical Review D
 Pub Date:
 March 2020
 DOI:
 10.1103/PhysRevD.101.053003
 Bibcode:
 2020PhRvD.101e3003A