Split Generation in the SUSY Mass Spectrum and B_s-{\bar B}_s Mixing

TL;DR

This paper proposes a split generation supersymmetric model where lighter first-two-generation squarks and sleptons explain the D0 di-muon anomaly, while heavier third-generation particles suppress flavor-changing neutral currents.

Contribution

It introduces a novel split generation SUSY framework that accounts for the di-muon anomaly and predicts enhanced B_s-{ar B}_s mixing with suppressed FCNCs.

Findings

Explains the D0 di-muon anomaly within a split SUSY model.

Predicts large contributions to B_s-{ar B}_s mixing.

Suppresses FCNCs via heavy third-generation squarks.

Abstract

We show that the like-sign di-muon anomaly reported recently by the D0 Collaboration can be explained in the supersymmetric standard model (SM) if the squarks and the sleptons in the first two generations have relatively small, but degenerate mass spectrum, and those in the third generation are larger as O(1-10)TeV. This split generation model provides large contributions to the B_s-{\bar B}_s mixing, although most of the FCNC's are suppressed due to the large masses of the third generation squarks or the GIM mechanism partially acting on the first and second generations.