A. Zee, Quantum Field Theory in a Nutshell · Problem VII.6.1

Field Theory Redux

Physics — QFT

Problem

Suppose there are

F

new families of quarks and leptons with masses of order

M

. Adopting the crude approximation described in exercise VI.8.2 of ignoring these families for

\mu

below

M

and of treating

M

as negligible for

\mu

above

M'

, run the renormalization group flow and discuss how various predictions, such as proton lifetime, are changed.