A Caltech Library Service

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. doi:10.7907/74cf-xv77.


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.))
Subject Keywords:Physics
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:
  • Preskill, John P. (chair)
  • Frautschi, Steven C.
  • McKeown, Robert D.
  • Zachariasen, Fredrik
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:11 Feb 2022 17:55

Thesis Files

[img] PDF - Final Version
See Usage Policy.


Repository Staff Only: item control page