Spin identification of heavy nonstandard bosons in dilepton and diphoton events at the LHC

TL;DR

This paper explores methods to determine the spin of heavy nonstandard bosons in dilepton and diphoton events at the LHC, crucial for identifying the underlying new physics models when peaks are similar in mass and event count.

Contribution

It introduces a symmetrically integrated angular asymmetry technique for spin identification of heavy bosons in LHC events, applicable to various nonstandard particles.

Findings

Effective spin discrimination for heavy bosons using angular asymmetry.

Potential to distinguish between spin-0, spin-1, and spin-2 particles.

Enhanced identification reach for new physics signals at the LHC.

Abstract

New Physics scenarios generally predict the existence of very heavy quantum states that can possibly manifest themselves as peaks in the cross sections at the LHC. For values of the parameters in certain domains, different nonstandard models can generate peaks with the same mass and same number of events. 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 here discuss, using a particularly suitable symmetrically integrated angular asymmetry applied to Drell-Yan dilepton and diphoton events at LHC, the identification reach on the exchanges in these reactions of the following heavy bosons: spin-2 Randall-Sundrum graviton excitations; spin-1 heavy neutral gauge bosons Z^\prime; and spin-0 SUSY R-parity violating sneutrinos.