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4735 results in Particle Physics and Nuclear Physics

Page 60 of 237

  • 12 - QED Radiative Corrections

  • André Rubbia, Eidgenössische Technische Hochschule Zürich
  • Book:
    Phenomenology of Particle Physics
    Published online:
    16 September 2022
    Print publication:
    12 May 2022, pp 390-413

  • Summary

    Quantum field theory is complex. Ask ourselves why we bother with all these quantum fields in the first place? QED is a field theory of well-defined perturbation expansion and in principle any physical prediction can be calculated with practically infinite precision. So, in this chapter we explore the techniques associated with computing “higher-order” or “purely quantum” effects of electromagnetism. The 𝑆-matrix was written as the Dyson expansion (see Section 9.2), where the factor in the expansion is the electric elementary charge 𝑒.

  • 25 - The Electroweak Theory

  • André Rubbia, Eidgenössische Technische Hochschule Zürich
  • Book:
    Phenomenology of Particle Physics
    Published online:
    16 September 2022
    Print publication:
    12 May 2022, pp 778-797

  • Summary

    In contradistinction to quantum electrodynamics, the Fermi theory is not renormalizable. This difficulty could not be solved by smoothing the point-like interaction by a massive, and therefore short-range, charged vector particle exchange (the so-called 𝑊+ and 𝑊− bosons): theories with massive charged vector bosons are not renormalizable either.

  • 20 - Heavy Quarks: Charm and Bottom

  • André Rubbia, Eidgenössische Technische Hochschule Zürich
  • Book:
    Phenomenology of Particle Physics
    Published online:
    16 September 2022
    Print publication:
    12 May 2022, pp 626-654

  • Summary

    The first speculations about “charm” were made in the mid-1960s [230], and full attention to it was given in the 1970s with the advent of the Cabibbo–GIM mechanism, as discussed in Section 23.13. In 1970 Drell and Yan discussed the production of massive lepton pairs in hadron–hadron collisions.

Page 60 of 237