The MC templates of the charm and beauty signals, and background for the interval 0.5 < $p_{\rm T}$ < 1 ${\rm GeV/}c$, -3.6 < $\eta$ < -2.5.
The distributions are modelled with a variable-width Gaussian function defined as $f(x) = A \cdot e^{(x-\mu)^2/2\sigma(x)^2}\ $ with x = $DCA_{\rm xy}$ and $\sigma(x) = \sigma_0^{\rm L} + \sigma_1^{\rm L} (\mu - x) + ... + \sigma_3^{\rm L} (\mu -x)^3$ for x < $\mu$, and $\sigma(x) = \sigma_0^{\rm R} + \sigma_1^{\rm R} (x - \mu) + ... + \sigma_6^{\rm R} (\mu -x)^6$ for x> $\mu$. The combined distribution fitted with $f(x) = C \cdot f_c(x) + B \cdot f_b(x) + Bkg \cdot f_{Bkg}$, where $B$, $C$ and $Bkg$ are free parameters corresponding to the normalisation, $f_c(x)$, $f_b(x)$ and $f_{Bkg}$ are the MC templates.