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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/ c 2 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/ 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. Introduction Supersymmetry (SUSY) is one of the most popular extensions of the Standard Model, which solves the hierarchy problem, can unify the gauge couplings and could provide dark matter candidates.

Playboy pdf files. The minimal supersymmetric standard model (MSSM) is the simplest phenomenologically viable realization of SUSY [, ]. The present study focuses on a subset of models featuring massive long-lived particles (LLP) with a measurable flight distance [, ]. LLP searches have been performed by Tevatron and LHC experiments [–], often using the Hidden Valley framework [] as a benchmark model (see also the study of Ref. The LHCb detector probes the forward rapidity region which is only partially covered by the other LHC experiments, and triggers on particles with low transverse momenta, which allows the experiment to explore relatively small LLP masses. In this paper a search for massive long-lived particles is presented, using proton-proton collision data collected by the LHCb detector at s = 7 and 8 TeV, corresponding to integrated luminosities of 1 and 2 fb -1, respectively. The event topology considered in this study is a displaced vertex with several tracks including a high p T muon. This topology is found in the context of the minimal super-gravity (mSUGRA) realisation of the MSSM, with R-parity violation [], in which the neutralino can decay into a muon and two jets.

Neutralinos can be produced by a variety of processes. In this paper four simple production mechanisms with representative topologies and kinematics are considered, with the assumed LLP mass in the range 20–80 GeV/ c 2. The LLP lifetime range considered is 5–100 ps, i.e. Larger than the typical b-hadron lifetime. It corresponds to an average flight distance of up to 30 cm, well inside the LHCb vertex detector. One of the production mechanisms considered in detail is the decay into two LLPs of a Higgs-like particle with an assumed mass between 50 and 130 GeV/ c 2, i.e.

In a range which includes the mass of the scalar boson discovered by the ATLAS and CMS experiments [, ]. In addition, inclusive analyses are performed assuming the full set of neutralino production mechanisms available in Pythia 6 []. In this case the LLP mass explored is in the range 23–198 GeV/ c 2, inspired by Ref. [], and different combinations of gluino and squark masses are studied. Detector description The LHCb detector [, ] is a single-arm forward spectrometer covering the pseudorapidity range 2. Event generation and detector simulation Several sets of simulated events are used to design and optimize the signal selection and to estimate the detection efficiency. Proton-proton collisions are generated in Pythia 6 with a specific LHCb configuration [], and with parton density functions taken from CTEQ6L [].