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arXiv · 1801.08510

NLO radiative corrections for Forward-Backward and Left-Right Asymmetries at a B-Factory

A. Aleksejevs·S. Barkanova·C. Miller·J. M. Roney·V. Zykunov
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Abstract

This paper presents the first calculations of the parity-violating polarization asymmetry and forward-backward asymmetry of the $e^- e^+ \rightarrow μ^+ μ^- (γ)$ process at a center-of-mass energy of 10.58 GeV with up to one-loop 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 center-of-mass energy at the mass of the $Υ(4S)$ 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 parity-violating and forward-backward asymmetries is significant and the scattering angle dependencies of the asymmetries is non-trivial. As an additional validation cross-check using an independent formulation, the calculated asymmetries are compared to results from the KK Monte Carlo generator.

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A. Aleksejevs, S. Barkanova, C. Miller, J. M. Roney, V. Zykunov. 2019-12-08. NLO radiative corrections for Forward-Backward and Left-Right Asymmetries at a B-Factory. https://doi.org/10.1103/physrevd.101.053003

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