Abstract
A search for physics beyond the Standard Model, in final states with at least one high transverse momentum charged lepton (electron or muon) and two additional high transverse momentum leptons or jets, is performed using 3.2 fb$^{-1}$ of proton--proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015 at $\sqrt{s}=13$ TeV. The upper end of the distribution of the scalar sum of the transverse momenta of leptons and jets is sensitive to the production of high-mass objects. No excess of events beyond Standard Model predictions is observed. Exclusion limits are set for models of microscopic black holes with two to six extra dimensions.
Highlights
Models of TeV-scale gravity postulate that the fundamental scale of gravity, MD, in a higher-dimensional space–time is much lower than is measured in our four-dimensional space–time
Nuisance parameters are included in the fits to describe the systematic uncertainties, taking into account the correlations across the processes and regions involved in each fit
A background likelihood fit to all control regions of both lepton channels, assuming no signal contribution, is used to predict the expected yields in validation regions (VRs) and to test the hypothesis that the data is well described with no signal in these regions
Summary
Models of TeV-scale gravity postulate that the fundamental scale of gravity, MD, in a higher-dimensional space–time is much lower than is measured in our four-dimensional space–time. Interesting signatures are expected in these models in the form of non-perturbative gravitational states such as microscopic black holes [5,6] Such final states could be produced in proton–proton (pp) interactions at the Large Hadron Collider (LHC) [7]. Since the gravitational interaction couples to the energy–momentum tensor rather than gauge quantum numbers, final states are expected to be populated “democratically”, according to the number of available Standard Model degrees of freedom For this reason, it is expected that a significant fraction of final states would contain leptons. [12], performed at a centre-of-mass energy of 8 TeV, with 3.2 fb−1 of data recorded by ATLAS in 2015 at 13 TeV This search is potentially sensitive to other forms of new physics at high-mass and involving the electroweak sector
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