Abstract
A search is presented for physics beyond the standard model in final states with two opposite-sign, same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 2.3 inverse femtobarns of proton-proton collisions at sqrt(s) = 13 TeV collected with the CMS detector at the LHC in 2015. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. Both search modes use several event categories in order to increase the sensitivity to new physics. These categories are based on the rapidity of the leptons, the multiplicity of jets and b jets, the scalar sum of jet transverse momenta, and missing transverse momentum. The observations in all signal regions are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry.
Highlights
√ at s = 13 TeV collected with the CMS detector at the LHC in 2015
A graphical representation of these results can be seen in figure 2, where the background prediction has been divided into its three components: FS, DY, and other processes with a Z boson, in order to illustrate their relative contributions in the different signal regions
A search for physics beyond the standard model has been presented in the opposite-sign, same-flavor lepton final state using a data sample of pp collisions collected at a centerof-mass energy of 13 TeV, corresponding to an integrated luminosity of 2.3 fb−1, recorded with the CMS detector in 2015
Summary
The central feature of the CMS apparatus is a superconducting solenoid, 13 m in length and 6 m in diameter, that provides an axial magnetic field of 3.8 T. The distance between the leptons is requested to be at least ∆φ2 + ∆η2 = ∆R > 0.3 to avoid reconstruction efficiency differences between electrons and muons in events with very collinear leptons This requirement is relaxed to ∆R > 0.1 when the mass of the dilepton system is consistent with a Z boson to preserve acceptance for Z bosons with large transverse momentum. They are identified based on the quality of the track fit and the number of associated hits in the tracking detectors For both lepton flavors, the impact parameter with respect to the reconstructed vertex with the largest p2T sum of associated tracks (primary vertex) is required to be within 0.5 mm in the transverse plane and below 1 mm along the beam direction. Normalization scale factors are applied to the simulated samples to account for differences between simulation and data in the trigger and reconstruction efficiencies
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