On a New Heavy Resonance Search in Dilepton and Diphoton Channels at the LHC

Abstract

Many models of physics beyond the Standard Electroweak The­ory predict the existence of very heavy resonances that can mani­fest themselves as peaks or bumps in the cross sections at the LHC. It is possible that heavy resonances would be discovered early in the Large Hadron Collider program. The next step would be to measure their properties (spin, mass, coupling constants etc.) to identify the underlying theory that gave rise to the resonances. In this case, the spin determination of a peak, requiring the angular analysis of the events, becomes crucial in order to identify the rel­evant nonstandard source. We discuss the identification reach of heavy bosons with spin-2 Randall-Sundrum graviton excitations, spin-1 extra neutral gauge bosons Z', and spin-0 scalar resonance in Drell - Yan dilepton and diphoton events at LHC.