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“School of Particles”

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Paper   IPM / Particles / 13989
School of Particles and Accelerator
  Title:   Single top quark production as a probe of anomalous tqγ and tqZ couplings at the FCC-ee
  Author(s): 
1 . Hamzeh Kanpour
2 . Sara Khatibi
3 . Morteza Khatiri Yanehsari
4 . Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  775
  Year:  2017
  Pages:   25-31
  Supported by:  IPM
  Abstract:
In this paper, a detailed study to probe the top quark flavour-changing neutral currents tqγ and tqZ at the future ee+ collider FCC-ee/TLEP in three different center-of-mass energies of 240, 350 and 500 GeV is presented. A set of useful variables are proposed and used in a multivariate technique to separate signal e e+Z/γ→ t q   ( t q ) from standard model background events. The 3σ discovery regions and the upper limits on the FCNC branching ratios at 95% C.L in terms of the integrated luminosity are presented. It is shown that with 100 fb−1 of integrated luminosity of data, FCC-ee would be able to exclude the effective coupling strengths above O (10−4−10−5) which is corresponding to branching fraction of O(0.01−0.001)%. We show that moving to a high-luminosity regime leads to a significant improvement on the bounds on the top anomalous couplings to a photon or a Z boson.


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