Abstract
A search for pair production of the supersymmetric partner of the top quark, the top squark, in proton-proton collision events at sqrt{s} = 13 TeV is presented in a final state containing hadronically decaying tau leptons and large missing transverse momentum. This final state is highly sensitive to high-tan β or higgsino-like scenarios in which decays of electroweak gauginos to tau leptons are dominant. The search uses a data set corresponding to an integrated luminosity of 77.2 fb−1, which was recorded with the CMS detector during 2016 and 2017. No significant excess is observed with respect to the background prediction. Exclusion limits at 95% confidence level are presented in the top squark and lightest neutralino mass plane within the framework of simplified models, in which top squark masses up to 1100 GeV are excluded for a nearly massless neutralino.
Highlights
Background estimationThe most significant background is tt production, either with two genuine τh decays or because of jets being misidentified as τh candidates
The test statistic used for the interpretation of the result is the profile likelihood ratio qμ = −2 ln (Lμ/Lmax), where Lμ is the maximum likelihood for a fixed signal strength μ, and Lmax is the global maximum of the likelihood [75]
The signature of top squark pair production in final states with two tau leptons has been explored in data collected with the CMS detector during 2016 and 2017, corresponding to integrated luminosities of 35.9 and 41.3 fb−1, respectively
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Forward calorimeters extend the pseudorapidity coverage provided by the barrel and endcap detectors. Events of interest are selected using a two-tiered trigger system [30]. The first level, composed of custom hardware processors, uses information from the calorimeters and muon detectors to select events at a rate of around 100 kHz within a time interval of less than 4 μs. The second level, known as the high-level trigger, consists of a farm of processors running a version of the full event reconstruction software optimized for fast processing, and reduces the event rate to around 1 kHz before data storage
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