Orateur
Francois Richard
(LAL/Orsay)
Description
Nine statistically significant decay channels are observed in LHC data around a mass of 650 GeV. We interpret three of them as coming from a narrow resonance observed in e+e-, 2 photons and ZZ which could be a J=2 Kaluza Klein graviton resonance called T690 (T for tensor with J=2). This hypothesis is reinforced by noting that this signal disappears in ZZ when treated as a scalar. Assuming a Randall Sundrum RS model, we conclude that LHC observes the predicted sequence T376, T690 and T1000. At variance with the RS model, T690 weakly couples to gluon pairs, suggesting a composite model interpretation. Perturbative unitarity requirements predict T++->W+W+ and T+->ZW resonances, again indicated by LHC data.
Auteur
Francois Richard
(LAL/Orsay)