Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-05-06
Phys.Lett. B596 (2004) 205-212
Physics
High Energy Physics
High Energy Physics - Phenomenology
Following referees comments a number of changes have been made for the published version: Title modified. Figure 7 modified to
Scientific paper
10.1016/j.physletb.2004.06.074
If signals suggesting supersymmetry (SUSY) are discovered at the LHC then it will be vital to measure the spin of the new particles to demonstrate that they are indeed the predicted super-partners. A method is discussed by which the spins of some of the SUSY particles can be investigated. Angular distributions in sparticle decays lead to charge asymmetry in lepton-jet invariant mass distributions. The size of the asymmetry is proportional to the primary production asymmetry between squarks and anti-squarks. Monte Carlo simulations are performed for a particular mSUGRA model point at the LHC. The resultant asymmetry distributions are consistent with a spin-0 slepton and a spin-half neutralino-two, but are not consistent with the pure phase-space decays one would obtain from both sparticles being scalars.
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