Left: Probability distribution of the event-by-event transverse momentum background density (see Eq.[1]). The mean and variance for two event classes are indicated in the figure. $p_\mathrm{T,\,ch\;jet}^\mathrm{raw}$ represents uncorrected jet $\pT$. Right: Probability distribution of background fluctuations calculated with the random cone approach and defined via Eq.[4]} (resolution parameter $R=0.4$).