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