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Paper   IPM / Particles / 15419
School of Particles and Accelerator
  Title:   Constraining top quark flavor violation and dipole moments through three and four-top quark productions at the LHC
  Author(s): 
1 . Malihe Malekhosseini
2 . Mehrdad Ghominejad
3 . Hamzeh Khanpour
4 . Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  98, 095001
  Year:  2018
  Supported by:  IPM
  Abstract:
In this paper, we examine the sensitivity of the three-top quark production at the LHC to the top quark flavor-changing neutral currents (FCNC) as well as the sensitivity of the four-top production to the strong and weak dipole moments of the top quark. Upper limits at 95% CL on the branching fractions of B(tqX), where X = g, Z, γ, H and q=u,c, are set by performing an analysis on three-top events in the same-sign dilepton channel. We consider the main sources of the background processes and a realistic detector simulation is performed at the center-of-mass energy of 14 TeV. In the second part of this work, based on the recent upper limits which have been set on the four-top quark cross section by the ATLAS and CMS collaborations from 13 TeV data, we constrain the top quark strong and weak dipole moments. The bounds on the top quark dipole moments are presented using the future LHC prospects for four-top quark cross section measurement.


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