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Search for Displaced Supersymmetry in events with an electron and a muon with large impact parameters

The collaboration
Phys.Rev.Lett. 114 (2015) 061801, 2015

Abstract (data abstract)
CERN-LHC. A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at $\sqrt{s}$ = 8 TeV. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.7 fb$^{-1}$. Events are selected with an electron and a muon that have transverse impact parameter values between 0.02 cm and 2 cm. The search has been designed to be sensitive to a wide range of models with non-prompt e-$\mu$ final states. Limits are set on the ''displaced supersymmetry'' model, with pair production of top squarks decaying into an e-$\mu$ final state via R-parity violating interactions. The results are the most restrictive to date on this model, with the most stringent limit being obtained for a top squark lifetime corresponding to $c\tau$ = 2 cm, excluding masses below 790 GeV at 95% confidence level.

• #### Table 1

Data from Figure 1, left

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Electron transverse impact parameter distribution for data and expected background processes after the preselection requirements have been applied. The event...

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Data from Figure 1, right

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Muon transverse impact parameter distribution for data and expected background processes after the preselection requirements have been applied. The event...

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Data from Table 1

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Numbers of expected and observed events in the three search regions (see the text for the definitions of these regions)....

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Data from Figure 2

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Expected and observed 95% CL cross section exclusion contours for top squark pair production in the plane of top squark...

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Data from twiki, Figure 1

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Electron reconstruction efficiency as function of its tranverse impact parameter, $d_0$.

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Data from twiki, Figure 2

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Muon reconstruction efficiency as function of its tranverse impact parameter, $d_0$.

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Data from twiki, Figure 3

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Electron selection efficiency as function of its tranverse momentum, $p_T$.

• #### Table 8

Data from twiki, Figure 4

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Muon selection efficiency as function of its tranverse momentum, $p_T$.