“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 13169
School of Particles and Accelerator
  Title:   Probing the Anomalous FCNC Interactions in Top-Higgs Final State and Charge Ratio Approach
1.  Sara Khatibi
2.  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Rev. D
  No.:  054011
  Vol.:  89
  Year:  2014
  Supported by:  IPM
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 bb¯ 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 pT and η as a strong tool to observe the signal. In particular, we show that the charge ratio increases significantly at large pT of the charged lepton. While the main background from tt¯ 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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