Ya. Dydyshka

In the paper we recalculate and discuss high-precision theoretical predictions for cross sections of the process $e^{+}{e}^{-}\to ZZ$. We assume a complete one-loop implementation and a possibility of estimating the initial state polarizations, as well as the full-phase calculation. Numerical results are provided by our Monte Carlo tools MCSANC integrator and ReneSANCe generator for typical energies and degrees of polarization of ILC and CLIC projects in two $\alpha (0)$ and $G_{\mu }$ electroweak schemes.

This paper gives high-precision theoretical predictions for cross sections of the process e⁺e^– → γZ for future electron-positron colliders. The calculations are performed using the SANC system. They include complete one-loop electroweak radiative corrections, as well as longitudinal polarization of the initial state. Numerical results are given for the center-of-mass system energy range \(\sqrt s \) = 250–1000 GeV with various polarization degrees in the α(0) and G_μ EW schemes. This study is a contribution to the research program of the CEPC project being under development in China.

A theoretical description of photon-pair production in polarized positron-electron annihilation is presented. Complete one-loop electroweak radiative corrections are calculated taking into account the exact dependence on the electron mass. Analytical results are derived with the help of the SANC system. The relevant contributions to the cross section are calculated analytically using the helicity amplitude approach. The cases of unpolarized and longitudinally polarized fermions in the initial state are investigated. Calculations are realized in the Monte Carlo integrator MCSANCee and generator ReneSANCe which allow one the implementation of any experimental cuts used in the analysis of $e^{+}{e}^{-}$ annihilation data of both low and high energies.

This paper presents high-precision theoretical predictions for s-channel $e^{+}{e}^{-}\to l^{-}{l}^{+}$ scattering. The calculations are performed using the sanc system. They take into account complete one-loop electroweak radiative corrections as well as the longitudinal polarization of the initial beams. The reaction observables are obtained using the helicity amplitude method with taking into account the initial- and final-state fermion masses. Numerical results are given for the center-of-mass energy range $\sqrt{s}=250–1000\mathrm{GeV}$ with various degrees of polarization.