Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-05
Phys.Lett. B409 (1997) 344-348
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, REVTEX, 3 figures included
Scientific paper
10.1016/S0370-2693(97)00921-0
Uniquely heavy with mass at the weak scale, the top quark may have large flavor changing couplings to Higgs bosons that are as yet unexplored. We show that such couplings can be directly probed at the LHC through the parton subprocess $c(\bar c)g \to t (\bar t)A^0$, where the pseudoscalar $A^0$ subsequently decays into $t \bar c$ or ${\bar t} c$, giving rise to the intriguing final state of like sign top quark pairs. After demanding $\ell^\pm\ell^\pm$, missing energy and two $b$-jets, the major background turns out to be $q\bar q' \to Wt \bar t$, which can be partially suppressed by jet counting. The signal can then manifest itself in the asymmetry of numbers of $\ell^+\ell^+$ and $\ell^-\ell^-$ events. To further improve the signal over background, efficient $t$ vs. $\bar t$ tagging methods should be developed.
Hou Wei-Shu
Lin Guey-Lin
Ma Chien-Yi
Yuan C.--P.
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