Measuring Semileptonic Asymmetries in LHCb

The $C\text{\hspace{0.17em}⁣}P$-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 ($a_{\mathrm{s}\mathrm{l}}^d$) and $B_s^0$ mesons ($a_{\mathrm{s}\mathrm{l}}^s$). Using their 2011 dataset, corresponding to an integrated luminosity of 1.0 ${\mathrm{f}\mathrm{b}}^{-1}$ obtained in 2011, LHCb measured a value of $a_{$\mathrm{s}\mathrm{l}$}^s = (-0.06 \pm 0.50_{$\text{stat}$} \pm 0.36_{$\text{syst}$}) %$. Combining the 2011 and 2012 datasets, with an integrated luminosity of 3 ${\mathrm{f}\mathrm{b}}^{-1}$, LHCb measured $a_{$\mathrm{s}\mathrm{l}$}^d = (-0.02 \pm 0.19_{$\text{stat}$} \pm 0.30_{$\text{syst}$}) %$. These are the most precise measurements of the parameters $a_{\mathrm{s}\mathrm{l}}^s$ and $a_{\mathrm{s}\mathrm{l}}^d$ to date. Plans for an updated result for $a_{\mathrm{s}\mathrm{l}}^s$ using the full 3 ${\mathrm{f}\mathrm{b}}^{-1}$ dataset are discussed. This will include new methods to determine detection asymmetries which are the dominating systematic uncertainty of the 2011 measurement.