Speaker
Juri Fiaschi
(University of Southampton)
Description
Di-lepton production at hadron colliders is by far the preferred channel to search for Z ′ bosons.
Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal,
thereby neglecting the presence of both (Z ′ ) finite width and interference (with the Standard
Model) effects. Furthermore, the primary observable used has traditionally been the cross section,
potentially enabling the extraction of the Z ′ resonance in the invariant mass of the di-lepton system.
Progress has occurred recently though, which has modified the above paradigm.
Indeed, it has been established that both finite width and interference effects ought to be taken into account
in experimental searches while still retaining the model independent approach ensured by the NWA.
We are showing these effects in a Composite Higgs Model scenario, which represent a realistic and well
motivated framework that naturally provides a spectrum with multiple Z' bosons.
Author
Juri Fiaschi
(University of Southampton)
