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An interesting alternative to supersymmetry (SUSY) for extending physicsbeyond the Standard Model is a model with universal extra dimensions (UED), inwhich the SUSY superpartners are replaced by Kaluza-Klein excitations of theStandard Model particles. If new particles are discovered at the LHC, even iftheir mass spectrum favours SUSY or UED, it will be vital to distinguishbetween their spin assignments in the two models as far as possible. We extendthe method proposed by Barr [hep-ph/0405052] to the UED case and investigatethe angular and charge asymmetries of decay distributions for sample massspectra of both SUSY and UED types. For hierarchical (`SUSY-type') mass spectrathere is a good chance of distinguishing the spin structures of the two models.However, a mass spectrum of the quasi-degenerate type expected in UED wouldmake it difficult to observe spin correlations.Comment: 19 pages, 12 figures, uses feynarts. Version 3: cross section for  non-identical left-right KK quark production correcte

Distinguishing spins in supersymmetric and universal extra dimension models at the large hadron collider