On the possibility of discrimination between pi0, eta, omega, K0(S) mesons and a photon based on the calorimeter information in the CMS detector

The possibility of \\pi^{0}, \\eta, \\omega and K_{s}^{0}mesons background separation from the signal photons produced directly in pp collisions is analyzed. The rejection factors for two pseudorapidity regions 0.4 < \\eta < 1.0 and 1.6 < \\eta < 2.0 and six E_t values, equal to 20, 40, 60, 80, 100 and 200 GeV, are calculated for a case when only the calorimeter information is used. The cases of \\eta, \\omega and K_{s}^{0}mesons decaying through neutral and charged channels are considered separately.