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Paper   IPM / Particles / 14567
School of Particles and Accelerator
Title:   Measuring anomalous WWγ and ttγ couplings using top+γ production at the LHC
Author(s):
 1 Seyed Mohsen Etesami 2 Sara Khatibi 3 Mojtaba Mohammadi Najafabadi
Status:   Published
Journal: Eur. Phys. J. C
No.:  10, 533
Vol.:  76
Year:  2016
Supported by:  IPM
Abstract:
We consider the electroweak production of a top quark in association with a photon at the LHC to probe the electroweak top quark couplings (ttγ) as well as the triple gauge boson couplings (WWγ). The study is based on the modifications of the ttγ and WWγ interactions via heavy degrees of freedom in the form of dimension-six operators which we add to the standard model Lagrangian. A binned angular asymmetry in single top quark plus photon events and cross section ratio are proposed to probe the anomalous ttγ and WWγ couplings. It is shown that the proposed angular asymmetry can distinguish anomalous ttγ, WWγ couplings from the standard model prediction and yield a great sensitivity.