A review of the spin determination of supersymmetric decay chain via neutralino at the LHC

Supersymmetry proposes that for each Standard Model fermion there exists a boson superpartner and each Standard Model boson has a fermion superpartner. Once new particles are discovered, e.g. at the Large Hadron Collider, a crucial question will be if these will be the supersymmetric partners of the Standard Model particles with the correct spin, i.e. spin-0 for the partners of the fermions. Hence, the spin of these new particles has to be investigated. In this paper, we present a study on the angular correlations of the products from sparticle decay chains via the neutralino, at √s = 14 TeV in pp collisions. Three mSUGRA benchmark points are used as examples to compare the different characteristics of the decay chain of interest. The effects of the spin can be seen through the invariant mass distributions of outgoing leptons and quark. An event selection for the study is proposed and is applied to the inclusive SUSY event samples simulated using fast detector simulation.