Evidence for an anomalous like-sign dimuon charge asymmetry

D0 Collaboration, V. Abazov et al

We measure the charge asymmetry $A\equiv (N^{++}-N^{--})/(N^{++}+N^{--})$ of like-sign dimuon events in 6.1~fb${}^{-1}$ of $p\bar{p}$ collisions recorded with the D0 detector at a…