search is presented for massive long-lived par-
ticles decaying into a muon and two quarks. The dataset
consists of proton-proton interactions at centre-of-mass ener-
gies of 7 and 8 TeV, corresponding to integrated luminosi-
tiesof1and2fb
−
1
, respectively. The analysis is performed
assuming a set of production mechanisms with simple topolo-
gies, including the production of a Higgs-like particle decay-
ing into two long-lived particles. The mass range from 20
to 80 GeV
/
c
2
and lifetimes from 5 to 100 ps are explored.
Results are also interpreted in terms of neutralino produc-
tion in different R-Parity violating supersymmetric models,
with masses in the 23–198 GeV/
c
2
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.