You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

They are formed by the Bjorken mechanism, while another method of producing them is known as [this name]-strahlung. When vacuum expectation value confers a major part of their characteristic property, a quadratic term is introduced to hZZ coupling and a quartic term is introduced into the hhh coupling. In an experiment at the Tevatron it may have decayed into a bottom quark anti-quark pair, and in another experiment, a 160 GeV particle decaying into two tau leptons may have been one of them. They are thought to have arisen due to spontaneous symmetry breaking as the universe cooled. That symmetry breaking occurs with the introduction of a namesake field, which accounts for why a photon is massless compared to the W and Z bosons. For 10 points, identify this particle, the only one from the standard model yet to be observed, which is hypothesized to impart mass to matter.
Output:
Science