Online ordering is currently unavailable due to technical issues. We apologise for any delays responding to customers while we resolve this. For further updates please visit our website https://www.cambridge.org/news-and-insights/technical-incident
Consider a collection of N two-component left-handed (12,0) fermions. The corresponding free-field Lagrangian is invariant under a global UN symmetry. When a mass term and interactions are added to the theory, the global UN symmetry is broken down to a discrete ℤ2 symmetry that reflects the fact that any term in the Lagrangian must contain an even number of fermion fields.
Review the options below to login to check your access.
Log in with your Cambridge Higher Education account to check access.
If you believe you should have access to this content, please contact your institutional librarian or consult our FAQ page for further information about accessing our content.