Is it $SU(2{)}_{\mathrm{L}}$ or just $U(1{)}_{\mathrm{Y}}$? $750$ GeV di-photon probes of the electroweak nature of new states

Abstract

The existence of a 750 GeV di-photon spin-0 resonance $S$ would imply the additional presence of new particles beyond the Standard Model, coupling directly to $S$ and electromagnetically charged. For an $SU(2{)}_{\mathrm{L}}$ singlet $S$, we explore the possibility of probing the $SU(2{)}_{\mathrm{L}}$ and $U(1{)}_{\mathrm{Y}}$ quantum numbers of the new states at the LHC by measuring/constraining the $WW$, $Z\gamma$ and $ZZ$ decays of $S$. We obtain robust prospects on the required LHC integrated luminosity to discover the new decay modes of $S$, and discuss the implications of these measurements for probing the electroweak nature of the new states. We also discuss the impact of $S$ mixing with the SM Higgs in such probes.

6 Pages, 5 Figures

References in corpus (3)

• The global electroweak fit at NNLO and prospects for the LHC and ILC
• Digamma, what next?
• Deciphering the CP nature of the 750 GeV resonance

Cited by in corpus (4)

• Interpreting the 750 GeV digamma excess: a review
• Learning from the New Higgs-like Scalar before It Vanishes
• Cornering diphoton resonance models at the LHC
• The 750 GeV threshold to a new particle world