ИСТИНА

The SUSY particle production is simulated using the ISAJET MC-generator. To simulate the ATLAS detector responce, the ATLFAST program package interfaced to ISAJET is used. The cascade decay of the gluino into two lightest neutralinos, g~ -> chi~0_2 X, chi~0_2 -> chi~0_1 l+ l- (l = e, mu) is studied at the SUGRA parameters m_0 = 800 GeV, m_1/2 = 200 GeV A_0 = 0, tan(beta) = 10, and for positive sign of mu. The used top quark mass is 175 GeV. With such the parameters the gluino mass is equal to 580 GeV and the mass difference between chi~0_2 and chi~0_1 is less than the mass of Z0. As a background, t tbar events were generated using the same program. With missing transverse momentum greater than 200 GeV, four and more jets in the calorimeters, the invariant mass of two isolated leptons less than 80 GeV, - the background in the lepton transverse momentum distribution is negligible.