Minimal flavor-changing $Z'$ models and muon $g-2$ after the $R_{K^*}$ measurement

Understand

There has been a steady interest in flavor anomalies and their global fits as ideal probes of new physics.

• If the anomalies are real, one promising explanation is a new $Z'$ gauge boson with flavor-changing coupling to bottom and strange quarks and a flavor-conserving coupling to muons and, possibly, electrons.
• We point out that direct production of such a $Z'$, emerging from the collision of $b$ and $s$ quarks, may offer a complementary window into these phenomena because collider searches already provide competitive constraints.
• On top of that, we analyse the same $Z'$ scenario in relation to another long-standing discrepancy between theory and experiment that concerns the anomalous magnetic moment of the muon.