Heavy Charged Higgs Signals at the LHC

Abstract

We discuss the viability of $gb\to tH\to ttb$ charged-Higgs signals at the proposed LHC $pp$ supercollider, in the decay channel $tt\to (bq{\bar{q}}^{\prime })(b\ell \nu )$. Here one top quark decays hadronically and one semileptonically, with all three $b$-quarks giving flavor-tagged jets. The principal backgrounds come from $ttg,ttq,ttc$ and $ttb$ continuum production, with possible mis-tagging of $g,q$ and $c$. We conclude that significant signals can be separated from these backgrounds, for limited but interesting ranges of the parameters $m_{H\pm }$ and $\tan \beta$, with the LHC energy and luminosity.

Standard latex, 9 pages. Two figures, postscript files or hardcopies available upon request (will also be uuencoded and submitted soon to hep-ph via "figures" command). MAD/PH/790

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