Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-24
JHEP 1102:002,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 3 figures, LaTeX
Scientific paper
10.1007/JHEP02(2011)002
A signal of two leptons and missing energy is challenging to analyze at the Large Hadron Collider (LHC) since it offers only few kinematical handles. This signature generally arises from pair production of heavy charged particles which each decay into a lepton and a weakly interacting stable particle. Here this class of processes is analyzed with minimal model assumptions by considering all possible combinations of spin 0, 1/2 or 1, and of weak iso-singlets, -doublets or -triplets for the new particles. Adding to existing work on mass and spin measurements, two new variables for spin determination and an asymmetry for the determination of the couplings of the new particles are introduced. It is shown that these observables allow one to independently determine the spin and the couplings of the new particles, except for a few cases that turn out to be indistinguishable at the LHC. These findings are corroborated by results of an alternative analysis strategy based on an automated likelihood test.
Chen Chien-Yi
Freitas Ayres
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