Study of interference effects in the search for flavour-changing neutral current interactions involving the top quark and a photon or a Z boson at the LHC

Barros, MauraCastro, Nuno FilipeErdmann, JohannesGeßner, GregorKröninger, KevinLa Cagnina, SalvatorePeixoto, Ana2021-04-062021-04-062020-03-30http://hdl.handle.net/2003/40135http://dx.doi.org/10.17877/DE290R-22010Flavour-changing neutral-current interactions of the top quark can be searched for in top-quark pair production with one top quark decaying to an up-type quark and a neutral boson, and they can be searched for in the single production of a top quark in association with such a boson. Both processes interfere if an additional up-type quark is produced in the case of single production. The impact of these interference effects on searches for flavour-changing neutral currents at the LHC is studied for the case where the neutral boson is a photon or a Z boson. Interference effects are found to be smaller than variations of the renormalisation and factorisation scales.en530Study of interference effects in the search for flavour-changing neutral current interactions involving the top quark and a photon or a Z boson at the LHCTextQuark <Physik>BosonPhotonLHCZ-BosonFlavourmischung