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Abstract
A search for new physics in energetic, high-multiplicity final states has been performed using proton–proton collision data collected with the CMS detector at a center-of-mass energy of 13TeV and corresponding to an integrated luminosity of 2.3fb−1. The standard model background, dominated by multijet production, is determined exclusively from control regions in data. No statistically significant excess of events is observed. Model-independent limits on the product of the cross section and the acceptance of a new physics signal in these final states are set and further interpreted in terms of limits on the production of black holes. Semiclassical black holes and string balls with masses as high as 9.5TeV, and quantum black holes with masses as high as 9.0TeV are excluded by this search in the context of models with extra dimensions, thus significantly extending limits set at a center-of-mass energy of 8TeV with the LHC Run 1 data.
Highlights
The standard model (SM) [1,2,3] of particle physics is a remarkably successful theory
Strong single or pair production of various new physics signals result in multijet final states, often accompanied by energetic leptons and/or invisible particles resulting in transverse momentum imbalance in the event
Examples include a large variety of SUSY signals, both with R-parity [5] conservation [6] and violation [7], and signals associated with technicolor models [8], axigluons [9], colorons [10,11,12,13], and various models with low-scale gravity
Summary
The standard model (SM) [1,2,3] of particle physics is a remarkably successful theory. In this Letter, we describe a model-independent search for new physics in high-multiplicity final states, and explicitly test the predictions of two possible solutions to the hierarchy problem. One of these solutions invokes a model with n large extra dimensions, col-. Like semiclassical BHs, SBs evaporate thermally, but at a constant Hagedorn temperature [30] independent of the SB mass, and produce a large number of energetic particles in the final state, with the composition similar to that for a semiclassical BH. While our choice of final states is inspired by the production of microscopic BHs, in this Letter we focus on a generic search (Section 8) that can be used to probe a large class of new-physics models. During Run 1 of the LHC, a number of searches for semiclassical and quantum BHs were performed at a center-of-mass energy of
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