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The W’ boson is a hypothetical, much more massive, cousin of the W boson. This article describes a new search for it. In the late 1960s, theorists were able to mathematically show that the electromagnetic and weak nuclear forces were actually two facets of a single common force, now called the electroweak force. This new theory postulated two new particles called the W and Z bosons. The theory was vindicated in 1983 with the discovery of both of them by…

The figures show the number of top events as a function of delta rapidity. The blue shape is that of the background, the green is the Standard Model prediction for top, and the points are our data. The plot on the left contains events in which the ttbar mass is less than 450 GeV/c2 and is very symmetric. The plot on the right is for a ttbar mass of greater than 450 GeV/c2 and illustrates the discrepancy between expected and…

The above image shows the expected and observed 95 percent confidence level upper limits on cross section multiplied by a branching ratio of a supersymmetric neutrino produced in quark-antiquark annihilation and decaying via lepton-flavor-violating interactions into (electron and muon) or (muon and tau) or (electron and tau) final states. Supersymmetry is a theoretical idea that states that for every fermion observed, there is another, yet-undiscovered, boson (and vice versa.) This theory effectively doubles the number of types of particles that…