RevModPhys.84.1477】Tests of the standard electroweak model at the energy frontier

Tev some of the shortcomings of the sm will be

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Unformatted text preview: of the shortcomings of the SM will be described in Sec II. Particle physics is embarking on a unique, and possibly defining, period in its history with the start of particle collisions at the Large Hadron Collider (LHC) at CERN. At the LHC, bunches of protons will be collided with a planned 14 TeV of center-of-mass energy, creating conditions that existed only a small fraction of a second after the big bang. This is 7 times the center-of-mass energy of collisions at the Fermilab Tevatron. For the first time, physicists will be able to directly probe the TeV energy scale in the laboratory, where new physics beyond the SM, with the potential to revolutionize our understanding of the Universe, could be apparent. We can only speculate about what form this will take. It is a tantalizing prospect that on the horizon is a revolution in our understanding of the Universe that includes a more complete [email protected][email protected][email protected] 0034-6861= 2012 =84(4)=1477(50) 1524 1524 1524 1524 1477 Ó 2012 American Physical Society Hobbs, Neubauer, and Willenbrock: Tests of the standard electroweak model at . . . 1478 theory of particles and their interactions which may explain dark matter and dark energy. The purpose of this review is to present tests of the electroweak (EW) sector of the SM [SUð2ÞL  Uð1ÞY ] at the highest available energies as a precursor to the LHC era. Our focus is on published results from collider data collected using the CDF (Aaltonen et al., 2007a) and D0 (Abazov et al., 2006a) detectors during Run II at the Fermilab Tevatron as it relates to our understanding of electroweak interactions and spontaneous symmetry breaking. After an overview of electroweak theory (Sec. II), we present current results on gauge boson properties and self-couplings (Sec. III), tests of electroweak physics from top-quark physics (Sec. IV), and searches for the Higgs boson (Sec. V). II. OVERVIEW The SM is an extremely successful theory of the strong, weak, and electromagnetic interactions. It is based on three generations of quarks and leptons, interacting via an SUð3ÞC  SUð2ÞL  Uð1ÞY gauge symmetry. The SUð2ÞL  Uð1ÞY symmetry is spontaneously broken to electromagnetism, Uð1ÞEM , by the vacuum-expectation value of the Higgs field. Given this field content and gauge symmetry, the most general theory that follows from writing down every term of dimension four or less is the SM. In the SM, as usually understood, neutrinos are exactly massless, and do not mix. Since neutrino mixing has been definitively observed, we must go beyond the SM in order to describe this phenomenon. There are two ways to do this. One way is to extend the field content of the model by adding additional fermion and/or Higgs fields (e.g., a right-handed neutrino or a Higgs triplet). The other way is to extend the SM by adding operators of dimensionality greater than four. There is only one operator of dimension five allowed by the gaug...
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This document was uploaded on 09/28/2013.

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