Distinguishing Spins in Supersymmetric and Universal Extra Dimension Models at the Large Hadron Collider

By J. Smillie, Bryan R. Webber. 2005

155 citations recorded by the source corpus.

An interesting alternative to supersymmetry (SUSY) for extending physics beyond the Standard Model is a model with universal extra dimensions (UED), in which the SUSY superpartners are replaced by Kaluza-Klein excitations of the Standard Model particles. If new particles are discovered at the LHC, even if their mass spectrum favours SUSY or UED, it will be vital to distinguish between their spin assignments in the two models as far as possible. We extend the method proposed by Barr [1] to the UED case and investigate the angular and charge asymmetries of decay distributions for sample mass spectra of both SUSY and UED types. For hierarchical (`SUSY-type') mass spectra there 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 would make it difficult to observe spin correlations.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/82d5143c0aa3bd50bf288e7d2211d3ff0bf7d2ab

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In Nuclear and High Energy Physics

Citations in the corpus

Yet Another Introduction to Dark Matter (2017, background): “20: Asymmetry in mj‘=mmax j‘ for supersymmetry (dashed) and universal extra dimensions (solid). The spectrum is assumed to be hierarchical, typical for supersymmetric theories. Figure taken from Ref. [34]. 94 7 COLLIDER SEARCHES observables, ˙ tot(m˜;m med) acceptance and d˙(m˜;m med) dE/ T ˘ d˙(m˜;”
Precise calculation of the relic density of Kaluza-Klein dark matter in universal extra dimensions (2005, background): “We should mention that several collider studies [4, 25,32,33] have already used an MUED benchmark point with R−1 = 500 GeV, a choice which we now see also happens to be relevant for cosmology.”
A review of the mass measurement techniques proposed for the Large Hadron Collider (2010, background): “It should be noted that the shapes of some of those differential distributions are sensitive to the spins and couplings of the particles involved, and that in fact most spin-sensitive analyses rely on this as their only means of extracting information about those spins [12, 15, 20, 30, 35].”
Discrimination of supersymmetry and universal extra dimensions at hadron colliders (2005, methodology): “2 (the crosssections for producing n = 1 KK quarks have been calculated in [14, 64, 65]).”