Robert Brout and François Englert showed how gauge bosons can acquire mass in a theory with spontaneous symmetry breaking. Their 1964 analysis couples a degenerate-vacuum matter system to a gauge field. The resulting excitation spectrum can contain massive vector particles rather than the massless scalar modes expected for an ungauged broken symmetry. This supplied a mechanism for relating interaction symmetry to particle mass, an essential ingredient of the later electroweak theory.[ref]
Broken Symmetry and the Mass of Gauge Vector Mesons by François Englert and Robert Brout. 1964 original paper, gauge coupling and massive-vector spectrum
A physicist who developed theoretical physics research at Université libre de Bruxelles.[ref]
Professional profile of Robert Brout (actus.ulb.be). Independent professional identity
Portrait of Robert Brout
. Pnicolet at the English Wikipedia; image provided by Robert Brout on 20 August 2007. CC BY-SA 3.0, via Wikimedia Commons. Source. Articles by others on the same topic
Robert Brout was a Belgian physicist best known for his work in theoretical physics. He made significant contributions to the field of particle physics, particularly regarding the Higgs mechanism and the unification of fundamental forces. Brout is notably recognized for co-developing the Brout-Englert-Higgs mechanism along with François Englert and Peter Higgs. This mechanism explains how particles acquire mass through their interaction with the Higgs field, a vital aspect of the Standard Model of particle physics.