Suppression of statistical background in the event structure of   away-side $\Delta\phi$ distribution
  An approach is proposed to analyze the azimuthal distribution of particles produced on the away side in heavy-ion collisions without background subtraction. Measures in terms of factorial moments are suggested that can suppress the statistical background, while giving clear distinction between one-jet and two-jet event structures on the away side. It is also possible to map the position and strength of the recoil jet to suitably chosen asymmetry moments. 
Charles B. Chiu and Rudolph C. Hwa