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We study the azimuthal distributions of Cherenkov photons in Extensive AirShowers (EASs) initiated by $\gamma$-ray, proton and iron primaries ofdifferent energies incident at various zenith angles over a high altitudeobservation level. The azimuthal distributions of electrons and positrons alongwith their asymmetric behaviour have also been studied here to understand thefeature of azimuthal distributions of Cherenkov photons in EASs. The mainmotivation behind this study is to see whether the azimuthal distribution ofCherenkov photons can provide any means to distinguish the $\gamma$-rayinitiated showers from that of hadron initiated showers in the ground based$\gamma$-ray astronomy experiment. Apart from this, such study is alsoimportant to understand the natures of $\gamma$-ray and hadronic showers ingeneral. We have used the CORSIKA 6.990 simulation package for generating theshowers. The study shows the double peak nature of the azimuthal distributionof Cherenkov photons which is due to the separation of electron and positronsin the azimuthal plane. The pattern of distribution is more sensitive for theenergy of the primary particle than it's angle of incidence. There is nosignificant difference between distributions for $\gamma$-ray and handroninitiated showers.

Azimuthal distribution of Cherenkov photons and corresponding electron-positron asymmetry in EASs of different primaries