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|Paper IPM / Particles / 14411||
In this paper we show that the diphoton mass spectrum in proton-proton collisions at the LHC is sensitive to the top quark flavor changing neutral
current in the vertices of tuγ and tcγ.
The diphoton mass spectrum measured by the CMS experiment at the LHC at a
center-of-mass energy of 8 TeV and an integrated luminosity of 19.5 fb−1 is used as an example
to set limits on these FCNC couplings.
It is also shown that the angular distribution of the diphotons is sensitive to
anomalous tuγ and tcγ couplings and it is a powerful tool to probe any value of the
branching fraction of top quark rare decay to an up-type quark plus a
photon down to the order of 10−4. We also show that the tuγ FCNC coupling has a significant
contribution to the neutron electric dipole
moment (EDM) and the upper bound on neutron EDM can be used to constrain the tuγ FCNC coupling.
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