Measuring Semileptonic Asymmetries in LHCb

The $CP$-violating flavour-specific asymmetry in neutral $b$ mesons provides a method for testing the Standard Model. The measurements from the D0 experiment yield values of this asymmetry that disagree with the Standard Model at a level of 3.6 $\sigma$. This contribution discusses the latest LHCb measurements in this sector both from $B^0$ mesons $(a^d_{sl})$ and $B^0_s$ mesons $(a^s_{sl})$. Using their 2011 dataset, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ obtained in 2011, LHCb measured a value of $a^s_{sl}$ = $(-0.06\pm 0.50_{stat} \pm 0.36_{syst})$%. Combining the 2011 and 2012 datasets, with an integrated luminosity of 3 fb$^{-1}$, LHCb measured $a^d_{sl}$ = $(-0.02\pm 0.19_{stat}\pm 0.30_{syst})$%. These are the most precise measurements of the parameters $a^s_{sl}$ and $a^d_{sl}$ to date. Plans for an updated result for $a^s_{sl}$ using the full 3 fb$^{-1}$ dataset are discussed. This will include new methods to determine detection asymmetries which are the dominating systematic uncertainty of the 2011 measurement.