Abstract
A search is presented for new physics in events with two low-momentum, oppositely charged leptons (electrons or muons) and missing transverse momentum in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data collected using the CMS detector at the LHC correspond to an integrated luminosity of 35.9fb−1. The observed event yields are consistent with the expectations from the standard model. The results are interpreted in terms of pair production of charginos and neutralinos (χ˜1± and χ˜20) with nearly degenerate masses, as expected in natural supersymmetry models with light higgsinos, as well as in terms of the pair production of top squarks (t˜ ), when the lightest neutralino and the top squark have similar masses. At 95% confidence level, wino-like χ˜1±/χ˜20 masses are excluded up to 230 GeV for a mass difference of 20 GeV relative to the lightest neutralino. In the higgsino-like model, masses are excluded up to 168 GeV for the same mass difference. For t˜ pair production, top squark masses up to 450 GeV are excluded for a mass difference of 40 GeV relative to the lightest neutralino.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5] is a widely considered extension of the standard model (SM) of particle physics, as it can provide solutions to several open questions in the SM, in particular those related to the hierarchy problem [6,7,8] and the nature of dark matter
In the models considered in this analysis, the visible decay products in the SUSY signal have low momentum, which can be distinguished from SM processes when a jet with large transverse momentum from initial-state radiation (ISR) leads to a large boost of the SUSY particle pair
The estimates in the signal regions (SRs) bins are extracted from a maximum likelihood fit of the data using the expected yields described in Section 6, namely the DY+jets, tt (2 ), and SS control region (CR)
Summary
Supersymmetry (SUSY) [1,2,3,4,5] is a widely considered extension of the standard model (SM) of particle physics, as it can provide solutions to several open questions in the SM, in particular those related to the hierarchy problem [6,7,8] and the nature of dark matter. In the models considered in this analysis, the visible decay products in the SUSY signal have low momentum, which can be distinguished from SM processes when a jet with large transverse momentum (pT) from initial-state radiation (ISR) leads to a large boost of the SUSY particle pair. This boost enhances the pmT iss in the event. Unlike the 8 TeV analysis, there is no upper limit on the number of jets in the event
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