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Non-conservation of baryon number at high energy in the Standard Model


Espinosa, Olivier R. (1990) Non-conservation of baryon number at high energy in the Standard Model. Dissertation (Ph.D.), California Institute of Technology.


We calculate the coupling constant and energy dependence of the scattering amplitudes for baryon- and lepton-number violating processes in the context of the standard model, in the semiclassical approximation. It is found that, to leading order in this expansion, the spin-averaged total cross sections for these processes grow as a power of the CM-energy and thus violate the bound imposed by unitarity. This result has a twofold implication: first, perturbation theory in the instanton sector of the electroweak theory must break down at high energies and, second, it strongly suggests that baryon and lepton number non-conservation might be observed experimentally at energies accesible in the near future.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Preskill, John P.
Group:Caltech Theory
Thesis Committee:
  • Unknown, Unknown
Defense Date:25 May 1990
Record Number:CaltechETD:etd-06062007-160632
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2482
Deposited By: Imported from ETD-db
Deposited On:13 Jun 2007
Last Modified:02 Dec 2020 01:58

Thesis Files

PDF (Espinosa_or_1990.pdf) - Final Version
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