Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-04-08
JHEP 0907:056,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 7 postscript figures, published version
Scientific paper
10.1088/1126-6708/2009/07/056
Several models for physics beyond the Standard Model predict new particles with a decay signature including hard photons and missing energy. Two well-motivated examples are supersymmetry with gauge-mediated breaking (GMSB) and the standard model with two universal extra dimensions. Both models lead to decay chains with similar collider signatures, including hard photon emission. The main discriminating feature are the spins of the new particles. In this paper we discuss how information about the spins of the particles can be extracted from lepton-photon or quark-photon invariant mass distributions at the Large Hadron Collider. The characteristic shapes of the distributions are derived analytically and then studied in a realistic Monte-Carlo simulation. We find that for a typical GMSB mass spectrum with particle masses below 1 TeV, already 10 fb$^{-1}$ integrated luminosity at 14 TeV center-of-mass energy are sufficient to discriminate the two models with high significance.
Ehrenfeld Wolfgang
Freitas Ayres
Landwehr Ananda
Wyler Daniel
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