If the diphoton excess at 750 GeV hinted by the 2015 data at the LHC is explained in terms of a scalar resonance participating in the breaking of the electroweak symmetry, this resonance must be accompanied by other scalar states for perturbative unitarity in vector-boson scattering to be preserved. The simplest setup consistent with perturbative unitarity and with the data of the diphoton excess is the Georgi-Machacek model. The custodial singlet of the model is responsible for the diphoton excess; it is mainly produced in the diphoton fusion channel, and its loop-induced coupling to the photon pairs is enhanced by the doubly charged scalar with its large (dimensionful) coupling to the custodial singlet.
750 GeV resonance at the LHC and perturbative unitarity 750 GeV RESONANCE at the LHC and PERTURBATIVE ... MARCO FABBRICHESI and ALFREDO URBANO / Fabbrichesi, M.; Urbano, A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 94:3(2016). [10.1103/PhysRevD.94.035004]
750 GeV resonance at the LHC and perturbative unitarity 750 GeV RESONANCE at the LHC and PERTURBATIVE ... MARCO FABBRICHESI and ALFREDO URBANO
Urbano A.
2016
Abstract
If the diphoton excess at 750 GeV hinted by the 2015 data at the LHC is explained in terms of a scalar resonance participating in the breaking of the electroweak symmetry, this resonance must be accompanied by other scalar states for perturbative unitarity in vector-boson scattering to be preserved. The simplest setup consistent with perturbative unitarity and with the data of the diphoton excess is the Georgi-Machacek model. The custodial singlet of the model is responsible for the diphoton excess; it is mainly produced in the diphoton fusion channel, and its loop-induced coupling to the photon pairs is enhanced by the doubly charged scalar with its large (dimensionful) coupling to the custodial singlet.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
