Bottom-Strange Associated Production at High Energy $e^{+}e^{-}$ Colliders in Standard Model

TL;DR

This paper calculates the rare production rates of bottom-strange quark pairs via flavor-changing neutral currents at high-energy electron-positron colliders within the Standard Model, providing precise cross section estimates.

Contribution

It offers the first detailed calculation of bsV couplings with all quark masses considered, improving accuracy for collider predictions.

Findings

Cross sections are about 10^{-3} fb at LEP II energies.

Cross sections increase to about 10^{-1} fb near the Z boson mass.

Precise non-zero quark mass effects are included in the calculations.

Abstract

We investigate the flavor changing neutral current bsV(V=$\gamma$,Z) couplings in the production vertex for the process $e^+e^-\to b\bar s or \bar b s$ in the standard model. The precise calculations keeping all quark masses non-zero are carried out. Production cross sections are found to be the order of $10^{-3}$ fb at LEP II and the order of $10^{-1}$ fb when center-of-mass energy is near the mass of neutral gauge boson Z.