Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
31+1 pages, 4 figures, 8 tables, JHEP.cls included
Scientific paper
The identification of the correct model for physics beyond the Standard Model requires the determination of the spin of new particles. We investigate to which extent the spin of a new particle $X$ can be identified in scenarios where it decays dominantly in three-body decays $X\to f\bar{f} Y$. Here we assume that $Y$ is a candidate for dark matter and escapes direct detection at a high energy collider such as the LHC. We show that in the case that all intermediate particles are heavy, one can get information on the spins of $X$ and $Y$ at the LHC by exploiting the invariant mass distribution of the two standard model fermions. We develop a model-independent strategy to determine the spins without prior knowledge of the unknown couplings and test it in a series of Monte Carlo studies.
Edelhäuser Lisa
Porod Werner
Singh Ritesh K.
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