Evidence for an Anomalous Like-Sign Dimuon Charge Asymmetry
(2010) Physical Review Letters — Vol. 105 (2010)
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- Abstract
- 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 marc:recorded with the D0 detector at a center-of-mass energy $\sqrt{s}=1.96$~TeV at the Fermilab Tevatron collider. From $A$ we extract the like-sign dimuon charge asymmetry in semileptonic $b$-hadron decays: $A^b_{sl}=-0.00957\pm0.00251\thinspace({\rm stat})\pm0.00146\thinspace({\rm sys})$. It differs by 3.2~standard deviations from the standard model prediction $A^b_{sl}({\rm SM})=(-2.3^{+0.5}_{-0.6})\times10^{-4}$, and provides first evidence of anomalous $CP$ violation in the mixing of neutral $B$ mesons.
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Tanasijczuk, A. J., D0, & et al. (2010). Evidence for an Anomalous Like-Sign Dimuon Charge Asymmetry. Physical Review Letters, 105. https://doi.org/10.1103/PhysRevLett.105.081801 (Original work published 2010)