Abstract
A search is performed for heavy long-lived charged particles using 3.0 {rm fb}^{-1} of proton–proton collisions collected at sqrt{s}= 7 and 8 TeV with the LHCb detector. The search is mainly based on the response of the ring imaging Cherenkov detectors to distinguish the heavy, slow-moving particles from muons. No evidence is found for the production of such long-lived states. The results are expressed as limits on the Drell–Yan production of pairs of long-lived particles, with both particles in the LHCb pseudorapidity acceptance, 1.8 < eta < 4.9. The mass-dependent cross-section upper limits are in the range 2–4 fb (at 95 % CL) for masses between 14 and 309 {mathrm {,GeV!/}c^2}.
Highlights
A charged massive stable particles (CMSP) loses energy mainly via ionisation; strongly interacting CMSPs are not considered here
As hadrons and electrons deposit more energy in the calorimeters than that expected for CMSPs, an efficient rejection of these backgrounds is achieved by requiring the sum of the ECAL and HCAL energies associated with the extrapolation of the charged particle to the calorimeters to be less than 1 % of the momentum of that particle
A search for pairs of long-lived charged particles, with masses in the range 124–309 GeV/c2, using τ1 pairs predicted by the mGMSB model as a benchmark scenario, is performed using data from proton–proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1, collected with the LHCb detector in the forward pseudorapidity range 1.8 < η < 4.9
Summary
A CMSP loses energy mainly via ionisation; strongly interacting CMSPs are not considered here In a detector such as LHCb a CMSP with a kinetic energy above about 5 GeV should be able to traverse the muon chambers. The analysis described in this study is mainly based on the absence of Cherenkov radiation in the RICH detectors This technique is used to search for pairs of CMSPs in LHCb, produced by a Drell–Yan mechanism. The β spectrum is shown, for two values of the CMSP mass, at centre-of-mass energy of 7 TeV The effects of such delayed detection on the efficiencies of the subdetectors are determined from simulation in which the timing information is modelled according to dedicated electronic measurements and tests in beam.
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