Search for supersymmetry in pp collisions at sqrt(s) = 8 TeV in final states with boosted W bosons and b jets using razor variables

TL;DR

This paper reports a search for supersymmetry in proton-proton collisions at 8 TeV, focusing on boosted W bosons and b jets, using razor variables to identify potential signals and setting exclusion limits on gluino masses.

Contribution

It introduces a novel analysis using jet substructure and razor variables to search for supersymmetry in compressed scenarios with boosted objects.

Findings

No significant excess observed over standard model predictions.

Excluded gluino masses up to 1.1 TeV for certain decay modes.

Set new limits on top squark and gluino masses.

Abstract

A search for supersymmetry in hadronic final states with highly boosted W bosons and b jets is presented, focusing on compressed scenarios. The search is performed using proton-proton collision data at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.7 inverse femtobarns. Events containing candidates for hadronic decays of boosted W bosons are identified using jet substructure techniques, and are analyzed using the razor variables M[R] and R^2, which characterize a possible signal as a peak on a smoothly falling background. The observed event yields in the signal regions are found to be consistent with the expected contributions from standard model processes, which are predicted using control samples in the data. The results are interpreted in terms of gluino-pair production followed by their exclusive decay into top squarks and top quarks. The analysis excludes gluino masses up to 1.1 TeV for light top squarks decaying solely to a charm quark and a neutralino, and up to 700 GeV for heavier top squarks decaying solely to a top quark and a neutralino.