Search for monotop signatures in proton-proton collisions at sqrt(s) = 8 TeV

TL;DR

This paper reports a search for new massive particles in proton-proton collisions at 8 TeV, focusing on signatures involving a single top quark and missing transverse momentum, with no deviations from the standard model found.

Contribution

It presents the first search for monotop signatures at 8 TeV and sets new lower mass limits on scalar and vector invisible bosons.

Findings

No deviations from the standard model observed.

Excluded scalar bosons below 330 GeV and vector bosons below 650 GeV.

Extended previous mass exclusion limits significantly.

Abstract

Results are presented from a search for new decaying massive particles whose presence is inferred from an imbalance in transverse momentum and which are produced in association with a single top quark that decays into a bottom quark and two light quarks. The measurement is performed using 19.7 inverse femtobarns of data from proton-proton collisions at a center-of-mass energy of 8 TeV, collected with the CMS detector at the CERN LHC. No deviations from the standard model predictions are observed and lower limits are set on the masses of new invisible bosons. In particular, scalar and vector particles, with masses below 330 and 650 GeV, respectively, are excluded at 95% confidence level, thus substantially extending a previous limit published by the CDF Collaboration.