Figure 4

(a) Relative beauty contribution to the heavy-flavour electron yield; measured from the azimuthal correlations between heavy-flavour decay electrons and charged hadrons (black circles) compared to that from the method based on the track impact parameter (red squares). The green dashed, red dotted, and blue dot-dashed lines represent the FONLL , $k_{\rm T}$-factorization , and GM-VFNS predictions, respectively. (b) The \pt -differential inclusive production cross section of electrons from beauty hadron decays obtained using the impact parameter method (red squares) and the e-h correlation (black circles) method. For both panels, the error bars (boxes) represent the statistical (systematic) uncertainties. The notation $\rm b (\rightarrow \rm c) \rightarrow \rm e$ is used to indicate that the relative beauty contribution includes those electrons which originate directly from beauty hadron decays and those which originate from charm hadron decays, where the charm hadron is the decay product of a beauty hadron.