Speakers
Description
Due to the large QCD background, tt spectroscopy is poorly doing at LHC with the exception of a toponium candidate first observed with high statistical significance by CMS. Our previous work predicts a contribution at almost the same mass from a Kaluza Klein graviton T376. For heavy scalars, following ATLAS and CMS, we describe how the top loop contribution to the gluon-gluon fusion mechanisms could produce a dip rather than a bump in the mass distribution, which prevents genuine searches for heavy resonances. It seems that the scalar resonances A470 and H650, indicated by other channels, as described in our previous work, start to be visible in the tt channel in RUN2 analyses presented by ATLAS and CMS. Together with H650, the tensor resonance T690 allows to interpret nine statistically significant indications observed in that region of mass. Unitarity requirements allow to predict W+W+ and ZW resonances which are indicated by LHC data. T690 seen as a KK graviton resonance allows to interpret a recent evidence for an excess in the four-top final state. It also predicts an excess of h125h125 final states measurable
at HL-LHC. This scenario offers excellent prospects for abundantly (109 events) producing a sequence of narrow resonances at future e+e- colliders. The present note summarises these arguments and describes available indications, complementing our collection of evidences for BSM resonances in view of electing a future collider.
