Abstract
Many new physics models predict production of heavy resonances in Drell-Yan channel and can be observed at the CERN LHC. If a new resonance is discovered as a peak in the dilepton invariant mass distribution at the LHC, the identification of its spin and couplings can be done by measuring production rates and angular distributions of the decay products. Here we discuss the spin-1 identification of Z′-boson for a set of representative models (SSM, E6, LR, and ALR) against the spin-2 RS graviton resonance and a spin-0 sneutrino resonance with the same mass and producing the same number of events under the resonance peak. We use the center-edge asymmetry for spin identification, as well as the total dilepton production cross section for the distinguishing the considered Z′-boson models from one another.
Highlights
If a new resonance is discovered as a peak in the dilepton invariant mass distribution at the LHC, the identification of its spin and couplings can be done by measuring production rates and angular distributions of the decay products
New heavy resonances are predicted by numerous New Physics (NP) scenarios, candidate solutions of conceptual problems of the standard model (SM)
For any NP model, one defines as identification reach the upper limit for the resonance mass range where it can be identified as the source of the resonance, against the other, potentially competitor scenarios, that can give a peak with the same mass and same number of events under the peak
Summary
New heavy resonances are predicted by numerous New Physics (NP) scenarios, candidate solutions of conceptual problems of the standard model (SM) This is the case of models of gravity with extra spatial dimensions, grand-unified theories (GUT), and supersymmetric (SUSY) theories with R-parity breaking (Rp). The model predicts a tower of narrow Kaluza–Klein (KK), spin-2, graviton excitations G(n) (n ≥ 1) with the peculiar mass spectrum M (n) = M (1)xn/x1 (xi are the zeros of the Bessel function, J1(xi) = 0) Their masses and couplings to the SM particles are proportional to Λπ and 1/Λπ, respectively, with Λπ the gravity effective mass scale on the SM brane. Sneutrino exchange Sneutrino (ν) exchange can occur in SUSY with R-parity breaking, and represents a possible, spin-0, interpretation of a peak in the dilepton invariant mass distribution of the process (1). For 10−4 ≤ X ≤ 10−2, the range is Mν >∼ 280 − 800 GeV [12]
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