That particular particle
What Peter Higgs achieved is nothing short of revolutionary. Despite his first paper on the idea being rejected, he hinted at another article, particle, a type of boson, that might be responsible for particles having mass. His revised 1964 paper, Broken Symmetries and the Masses of Gauge Bosons, published after Englert and Brouts, was the first to state the existence of a new particle.
Source: indiatimes.com