“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 15733
School of Particles and Accelerator
  Title:   Probing the nonstandard top-gluon couplings through ttγγ production at the LHC
1.  Seyed Mohsen Etesami
2.  Esmat Darvish Roknabadi
  Status:   Published
  Journal: Phys. Rev. D
  No.:  015023
  Vol.:  100
  Year:  2019
  Supported by:  IPM
In this paper, we investigate the anomalous chormo-electric and chormo-magnetic dipole moments of top quark through the top pair production in association with two photons at the LHC. We present first the strategy to reconstruct this process assuming different source of background processes. Then we focus on the existing constraints from inclusive top pair production from Tevatron and LHC, adding the new LHC measurement. Afterwards, we introduce the new cross section ratio R2γ/γttγγttγ and show the usefulness of this ratio to cancel most of the systematic uncertainties and its special functionality to constrain dipole moments. At the end, we use the scaler sum of the transverse momentum of jets, HT, in order to define a signal dominated region and to obtain the limits on these anomalous top couplings using the different amount of expected data from LHC.

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