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

Jennifer M. Smillie | Zendy; B.R. Webber | Zendy

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

Author(s) -

Jennifer M. Smillie,

B.R. Webber

Publication year - 2005

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2005/10/069

Subject(s) - supersymmetry , universal extra dimension , particle physics , physics , large hadron collider , spins , physics beyond the standard model , degenerate energy levels , mass spectrum , standard model (mathematical formulation) , minimal supersymmetric standard model , dimension (graph theory) , spin (aerodynamics) , quantum mechanics , gauge (firearms) , mathematics , ion , archaeology , history , condensed matter physics , pure mathematics , thermodynamics

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

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