Search for a Heavy Particle Decaying to a Top Quark and a Light Quark in pp¯ Collisions at s=1.96 TeV

Le résumé fourni par la source

We present a search for a new heavy particle $X$ produced in association with a top quark, $p\overline{p}\ensuremath{\rightarrow}t(X\ensuremath{\rightarrow}\overline{t}q)$ or $p\overline{p}\ensuremath{\rightarrow}\overline{t}(\overline{X}\ensuremath{\rightarrow}t\overline{q})$, where $q$ stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark ($q$) is reconstructed as a jet ($j$), this gives a $\overline{t}+j$ or $t+j$ resonance in $t\overline{t}+\mathrm{\text{jet}}$ events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of $8.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production ($p\overline{p}\ensuremath{\rightarrow}Xt$ or $\overline{X}\overline{t}$) at 95% confidence level from 0.61 pb to 0.02 pb for $X$ masses ranging from $200\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$ to $800\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$, respectively.

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