Search for massive long-lived particles decaying semileptonically in the LHCb detector

A search is presented for massive long-lived particles
decaying into a muon and two quarks. The dataset
consists of proton-proton interactions at centre-of-mass energies
of 7 and 8 TeV, corresponding to integrated luminosities
of 1 and 2 fb−1, respectively. The analysis is performed
assuming a set of production mechanisms with simple topologies,
including the production of a Higgs-like particle decaying
into two long-lived particles. The mass range from 20
to 80 GeV/c2 and lifetimes from 5 to 100 ps are explored.
Results are also interpreted in terms of neutralino production
in different R-Parity violating supersymmetric models,
with masses in the 23–198 GeV/c2 range. No excess above
the background expectation is observed and upper limits are
set on the production cross-section for various points in the
parameter space of theoretical models.