R. M. Barnett

Multilepton Signal for Supersymmetric Particles in the Fermilab Tevatron Data

The CDF and D0 Collaborations have both reported unusual events in the dilepton + jets sample with very high lepton and missing transverse energies. It is possible, but very unlikely, that these events originate from top quark pair production; however, they have characteristics that are better accounted for by decays of supersymmetric quarks with mass in the region of 300GeV: {tilde {ital q}}{r_arrow}{ital q}{chi}{tilde {ital w}}, {chi}{tilde {ital w}}{r_arrow}{nu}l, l{tilde {ital w}}{r_arrow}l{chi}{sup 0}{sub 1}. Such a supersymmetric origin also leads to events with large missing transverse energy and either 0, 1, 2 same-sign, or 3isolated charged leptons. {copyright} {ital 1996 The American Physical Society.}

Searching for top decays to charged Higgs bosons with the SDC detector

We have studied the capabilities of the SDC detector to discover a charged Higgs boson in the decay t {yields} H{sup +}b for the particular case m{sub t} = 250 GeV/c{sup 2} and m{sub H}{sup {plus minus}} = 150 GeV/c{sup 2}. The two methods investigated both tag t{anti t} events by demanding a high-p{sub t} lepton and two identified b-quark jets. In the first technique we search for an excess of {tau} leptons from H{sup {plus minus}} decays; in the second, we look for a peak in the two-jet mass distribution resulting from H{sup +} {yields} c{anti s}. In combination, these two techniques allow discovery of such a charged Higgs boson over the entire interesting range of two-Higgs-doublet model parameter space. 8 refs., 11 figs., 2 tabs.