[PDF] Top 20 Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at root s=8 TeV

... assuming that the dilepton system produced when the LL particle decays is usually boosted with respect to its flight direction, the direction of ¯p ll is correlated with that of ¯v ll .... In ... See full document

... events in the calorimeter search would ...ray muons. While it is possible for the hadronic shower of an R-hadron decay to pass through the first layers of the iron yoke and induce ... See full document

... protons. At the experiments, bunch crossings (BX) nominally occur at intervals of 25 ...ns. In 2012, however, the LHC operated with a 50 ns minimum interval between proton bunches and the most ... See full document

... accelerates two proton beams in opposite directions such that the protons collide at several points along the LHC ring, including one at the CMS ...of proton bunches ... See full document

... includes that calculated from the other interaction vertices in the event (pileup), arising from the uncertainty in assigning the photon candidate to a particular ...presented in Ref. [20] . ... See full document

... LJ search criteria by setting limits on models that predict LJs in the final ...new decay channels may thus easily ...The two Falkowski–Ruderman– Volansky–Zupan (FRVZ) models [ 6 ... See full document

... final-state particles are sim- ilar for all five ...of two leading leptons with high p T and two subleading leptons with relatively low p ...The two leptons from the same parent ϕ boson can be ... See full document

... selection that can be used to reinterpret the results of our ...models in which there are two long-lived particles, this generator-level selection approximately replicates the ... See full document

... models, at all considered masses, is presented in Table IV ...to decay into q ...neutralino that decays into a quark- antiquark pair and a muon) are presented in .... ... See full document

... given that the mis-identification rates of jets as electrons or muons are small [ 24 , 43 ...pairs in the background because the leptons are either misidentified or are ... See full document

... neutral, long-lived particles that give rise to a distinctive signature of two leptons arising from a highly displaced ...events that could be interpreted as such a signal [ 4 – ... See full document

... dijet final state can be realized in other extensions of the SM that predict scalar or vector ...such particles is to achieve a unified description of quarks and leptons [ 4 ...bosons ... See full document

... a search for long-lived neutral particles (LLPs), produced by proton–proton interac- tions at √ s = 8 TeV, that decay to hadronic jets ... See full document

... H in the mass range 200 to 1000 GeV, de- caying promptly into a pair of long-lived X bosons in the mass range 50 to 350 GeV, which further decay to quark-antiquark ...proper ... See full document

... colleagues in the CERN accelerator departments for the excellent perfor- mance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions ... See full document

... deposits in the ...charged particles originating from the decay of a long-lived particle will usually exhibit large displacements with respect to the primary vertex, allowing the ... See full document

... events in a suitable subset of the other 802 BXs i.e. during intervals that are “out-of-time” with respect to normal ...employed in the earlier CMS study [ 14 , 15 ] that uses the two ... See full document

... asymmetry in the Universe. In addition, there exist theo- retical issues such as the hierarchy problem, that suggest that an extension of the SM, predicting new particles, is needed to ... See full document

... objects that pass photon identification criteria to the number that fail at least one of the isolation ...production that must be removed from the numerator of the ...events that pass ... See full document

... the decay, the chargino has a lifetime on the order of 1 ns and the pion generally has too low momentum to yield a reconstructed ...excluded at 95% confidence level, as are charginos with lifetimes from ... See full document