Invariant mass distributions in cascade decays

Details Invariant mass distributions in cascade decays Invariant mass distributions in cascade decays

2005-10-27

arxiv.org/abs/hep-ph/0510356v1

JHEP 0603:034,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

39 pages, 14 figures (colour), JHEP class

Scientific paper

10.1088/1126-6708/2006/03/034

We derive analytical expressions for the shape of the invariant mass distributions of massless Standard Model endproducts in cascade decays involving massive New Physics (NP) particles, D -> Cc -> Bbc -> Aabc, where the final NP particle A in the cascade is unobserved and where two of the particles a, b, c may be indistinguishable. Knowledge of these expressions can improve the determination of NP parameters at the LHC. The shape formulas are composite, but contain nothing more complicated than logarithms of simple expressions. We study the effects of cuts, final state radiation and detector effects on the distributions through Monte Carlo simulations, using a supersymmetric model as an example. We also consider how one can deal with the width of NP particles and with combinatorics from the misidentification of final state particles. The possible mismeasurements of NP masses through `feet' in the distributions are discussed. Finally, we demonstrate how the effects of different spin configurations can be included in the distributions.

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