[@PhysRevLett.111.081802]. The search is sensitive to the production of pairs of heavy particles, provided that the decays of these particles produce significant . The jets in each event are cast into two disjoint sets, referred to as “megajets”.

The razor variables ${\ensuremath{M_R}\xspace}$ and ${\ensuremath{R^2}\xspace}$, defined in Section \[sec:prd-razor\], are calculated from the four-momenta of these megajets event-by-event, and the search is performed by determining the expected distributions of SM processes in the two-dimensional (${\ensuremath{M_R}\xspace}$, ${\ensuremath{R^2}\xspace}$) razor plane. A critical feature of the razor variables is that they are computed in the approximate center-of-mass frame of the produced superpartner candidates.

The megajets represent the visible part of the decay chain of pair-produced superpartners, each of which decays to one or more visible SM particles and one stable, weakly interacting lightest SUSY particle (LSP), here taken to be the lightest neutralino $\chiz_1$. In this framework the reconstructed products of the decay chain of each originally produced superpartner are collected into one megajet. Every topology can then be described kinematically by the simplest example of squark-antisquark production with the direct two-body squark decay $\PSq \to \Pq \chiz_1$, denoted a “dijet plus " final state, to which the razor variables strictly apply.

The strategy 