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Electroweak scale

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Standard energy scale for electroweak processes of 246 GeV
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In particle physics, the electroweak scale, also known as the Fermi scale, is the energy scale around 246 GeV, a typical energy of processes described by the electroweak theory. The particular number 246 GeV is taken to be the vacuum expectation value v = ( G F 2 ) − 1 / 2 {\displaystyle v=(G_{F}{\sqrt {2}})^{-1/2}} of the Higgs field (where G F {\displaystyle G_{F}} is the Fermi coupling constant). In some cases the term electroweak scale is used to refer to the temperature of electroweak symmetry breaking, 159.5±1.5 GeV . In other cases, the term is used more loosely to refer to energies in a broad range around 10 - 10 GeV. This is within reach of the Large Hadron Collider (LHC), which is designed for about 10 GeV in proton–proton collisions.

Interactions may have been above this scale during the electroweak epoch. In the unextended Standard Model, the transition from the electroweak epoch was not a first or a second order phase transition but a continuous crossover, preventing any baryogenesis. However many extensions to the standard model including supersymmetry and the inert double model have a first order electroweak phase transition (but still lack additional CP violation).

See also

References

  1. D'Onofrio, Michela and Rummukainen, Kari (2016). "Standard model cross-over on the lattice". Phys. Rev. D93 (2): 025003. arXiv:1508.07161. Bibcode:2016PhRvD..93b5003D. doi:10.1103/PhysRevD.93.025003. S2CID 119261776.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. Bergerhoff, Bastian; Wetterich, Christof (1998). "Electroweak Phase Transition in the Early Universe?". Current Topics in Astrofundamental Physics: Primordial Cosmology. Springer Netherlands. pp. 211–240. arXiv:hep-ph/9611462. doi:10.1007/978-94-011-5046-0_6. ISBN 978-94-010-6119-3. S2CID 13949582.


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