TRILEPTON SIGNAL OF MINIMAL SUPERGRAVITY AT THE TEVATRON INCLUDING TAU-LEPTON CONTRIBUTIONS

The trilepton signal with missing transverse energy (3l + (E) over bar (T), with l= e or mu) from chargino-neutralino (chi(1) +/- chi(2)(0)) associated production and decays is studied for the upgraded Fermilab Tevatron Collider with 2 TeV center of mass energy and integrated lumi nosity of 2 fb(-1) (MI) to 20 fb(-1) (TeV33). In some regions of param eter space in the minimal supergravity model, chi(1)(+/-) and chi(2)(0 ) decay dominantly into final states with tau leptons via real or virt ual <(tau)over tilde>(1) sleptons. The contributions from tau - lepton ic decays increase the trilepton signal from chi(1)+/-chi(2)(0) by at least a factor of two when soft but realistic cuts on lepton transvers e momenta are used. With the Main Injector, a trilepton signal can be detected at tan beta = upsilon(2)/upsilon(1) similar to 3 for universa l masses m(1/2),m(0) less than or similar to 200 GeV. (C) 1998 Publish ed by Elsevier Science B.V. All rights reserved.