Stringy explanation of $b \to s \ell^+ \ell^-$ anomalies

TL;DR

This paper proposes that string-inspired models with a low-mass Z' gauge boson can explain recent anomalies in B-meson decays, linking string theory compactifications to observable particle physics phenomena.

Contribution

It introduces a string-motivated framework with a low-scale Z' boson that accounts for B-decay anomalies, constraining intersecting D-brane models.

Findings

Stringy Z' can explain B-decay anomalies.

Constraints on D-brane models from flavor physics.

Compatibility with low string scale models.

Abstract

We show that the recent anomalies in $b \to s \ell^+ \ell^-$ transitions observed by the LHCb collaboration can be accommodated within string motivated models with a low mass $Z^{\prime}$ gauge boson. Such $Z^{\prime}$ gauge boson can be obtained in compactifications with a low string scale. We consider a class of intersecting D-brane models, in which different families of quarks and leptons are simultaneously realized at different D-brane intersections. The explanation of $b \to s \ell^+ \ell^-$ anomalies via a stringy $Z^{\prime}$ sets important restrictions on these viable D-brane constructions.