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arXiv · 1402.3073

Probing the Anomalous FCNC Interactions in Top-Higgs Final State and Charge Ratio Approach

Sara Khatibi·Mojtaba Mohammadi Najafabadi
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Abstract

We study the anomalous production of a single top quark in association with a Higgs boson at the LHC originating from flavor changing neutral current (FCNC) interactions in $tqg$ and $tqH$ vertices. We derive the discovery potentials and $68\%$ C.L. upper limits considering leptonic decay of the top quark and the Higgs boson decay into a $b\bar{b}$ pair with 10 fb$^{-1}$ integrated luminosity of data in proton-proton collisions at the center-of-mass energy of 14 TeV. We propose a charge ratio for the lepton in top quark decay in terms of lepton $p_{T}$ and $\eta$ as a strong tool to observe the signal. In particular, we show that the charge ratio increases significantly at large $p_{T}$ of the charged lepton. While the main background from $t\bar{t}$ is nearly charge symmetric and $W+jets$ background has much smaller charge ratio with respect to the signal. We show that this feature can also be used in the probe of anomalous single top production with a $Z-$boson or a photon which are under the attention of the experimental collaborations.

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Sara Khatibi, Mojtaba Mohammadi Najafabadi. 2014-02-13. Probing the Anomalous FCNC Interactions in Top-Higgs Final State and Charge Ratio Approach. https://doi.org/10.1103/physrevd.89.054011

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