DETERMINING THE PARAMETERS OF THE MINIMAL SUPERGRAVITY MODEL FROM 2L-T(MISS)+(JETS) FINAL-STATES AT CERN LHC - ART. NO. 095010(E)

We analyze the events with two same-flavor, opposite-sign leptons+ E-T (miss)+(jets) as expected in pp collisions at the CERN LHC within the framework of the minimal supergravity model. The objective is the dete rmination of the parameters m(0) and m(1/2) of this model (for a given value of tan beta). The signature l(+)l(-) + E-T(miss)+(jets) selects the leptonic decays <(chi)over tilde>(0)(2)--><(chi)over tilde>(0)(1) l(+)l(-), <(chi)over tilde>(0)(2)-->l(-/+)--><(chi)over tilde>(0)(1)l( +)l(-) of <(chi)over tilde>(0)(2) produced in (g) over tilde/(q) over tilde decays. We exploit the fact that the invariant dilepton mass dis tribution has a pronounced structure with a sharp edge at the kinemati cal end point even in such an inclusive final state over a significant part of parameter space. We determine the domain of parameter space w here the edge is expected to be visible. We show that a measurement of this edge already constrains the model parameters essentially to thre e lines in the (m(0),m(1/2)) parameter plane. We work out a strategy t o discriminate between the three-body leptonic decays of <(chi)over ti lde>(0)(2) and the decays into sleptons (l) over tilde(L,R). This proc edure may make it possible to get information on SUSY particle masses already with low luminosity, L-int = 10(3) pb(-1). [S0556-2821(98)0892 1-8]