Searching fort→chwith multileptons
Citations Over TimeTop 10% of 2012 papers
Abstract
The results of a multilepton search conducted by the CMS collaboration with $5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected from 7 TeV $pp$ collisions are used to place the first bound on the rare flavor-changing decay of the top quark to a Higgs boson and charm quark. Combining results from a number of exclusive three- and four-lepton search channels yields an estimated upper limit of $\mathrm{Br}(t\ensuremath{\rightarrow}ch)<2.7%$ for a Higgs boson mass of 125 GeV. The sensitivity of future dedicated searches for $t\ensuremath{\rightarrow}ch$ could be improved by adding exclusive same sign dilepton channels, as well as by subdividing channels based on $b$-quark tagging and partial kinematic top quark and Higgs boson tagging. This bound may be interpreted more widely within a range of new physics processes that yield final states with a $W$-boson in association with a Higgs boson. For such processes with kinematics that are similar to top-anti-top production and decay, the estimated limit on cross section times branching ratio corresponds to roughly $\ensuremath{\sigma}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{Br}(pp\ensuremath{\rightarrow}WhX)<9\text{ }\text{ }\mathrm{pb}$.
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