Search for heavy bottom-like quarks decaying to an electron or muon and jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV

Abstract

We report the most sensitive direct search for pair production of fourth-generation bottom-like chiral quarks ($b^{\prime }$) each decaying promptly to $tW$. We search for an excess of events with an electron or muon, at least five jets (one indentified as due to a $b$ or $c$ quark) and an imbalance of transverse momentum using data from $p\bar{p}$ collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8 fb${}^{-1}$. We observe events consistent with background expectation and calculate upper limits on the $b^{\prime }$ pair production cross section (${\sigma }_{b\overline{b^{\prime }}}\lesssim 30$ fb for $m_{b^{\prime }}>$375 GeV/$c^2$) and exclude $m_{b^{\prime }}<372$ \gevcc at 95% confidence level.

For submission to PRL

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