Nonlinear Phenomena in Complex Systems, 2009, Vol.12, No.4, pp.419-424

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2009, Vol.12, No.4, pp.419-424

Spin and Model Identification of Z^' Bosons in Lepton-Pair Production at the LHC.
A. A. Pankov and A. V. Tsytrinov

Heavy neutral gauge Z^' bosons are predicted by many models of physics beyond the Standard Model. If a new neutral gauge boson is discovered at the LHC in the clean Drell-Yan channel, the characterization of its spin and couplings will proceed via measuring production rates and angular distributions of the decay products. We reanalyse the potential of the LHC to discover Z^' and found that new Z^' bosons can be observed in the Drell-Yan channel, , up to the masses of about 5 TeV (at level) for an integrated luminosity of 100 fb^-1. Also, we study the discrimination between a Z^' boson (spin-1) against the Randall-Sundrum graviton resonance (spin-2) and spin-0 resonance (sneutrino) with the same mass and producing the same number of events in the cross section. The spin of a heavy Z^' gauge boson can be established with A_CE up to 3.0 TeV, for an integrated luminosity of 100 fb^-1, or minimal number of events around 110. We examine the distinguishability of various theoretical models (, and Z^'_ALR) describing the Z^' and its coupling constants to quarks and leptons. We find that one can distinguish among the six representative Z^' models up to 2.1 TeV at 95% C.L.
Key words: extra neutral gauge bosons, graviton, sneutrino, LHC

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