The Shifted Peak: Resolving Nearly Degenerate Particles at the LHC

We propose a method for determining the mass difference between two particles, \slep_1 and \slep_2, that are nearly degenerate, with Δ{m}, defined as m_2-m_1, being much less than m_1. This method applies when (a) the \slep_1 momentum can be measured, (b) \slep_2 can only decay to \slep_1, and (c) \slep_1 and \slep_2 can be produced in the decays of a common mother particle. For small Δ{m}, \slep_2 cannot be reconstructed directly, because its decay products are too soft to be detected. Despite this, we show that the existence of \slep_2 can be established by observing the shift in the mother particle invariant-mass peak, when reconstructed from decays to \slep_2. We show that measuring this shift would allow us to extract Δ{m}. As an example, we study supersymmetric gauge-gravity hybrid models in which \slep_1 is a meta-stable charged slepton next-to-lightest supersymmetric particle and \slep_2 is the next-to-lightest slepton with Δ{m} of about 5 GeV.

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