Theory and collider phenomenology at the electroweak scale

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The objective of particle physics is to discover what the universe is made of and how it works. Our quest to understand nature has produced a remarkably successful understanding of the structure of matter, described by the Standard Model of particle physics. However, we know that the Standard Model is incomplete for (at least) two reasons: it fails to explain the extreme weakness of gravity compared to the other forces of nature, and it is unable to account for the "dark matter" that makes up about 80% of the mass in the universe. Also, the Standard Model's explanation for the origin of mass of ordinary particles, the so-called Higgs mechanism, is still experimentally untested. We have come now to a very exciting time when experiments in the next few years (particularly at the Large Hadron Collider, now in its second year of operation at CERN in Geneva, Switzerland) are expected to provide answers to these questions.