In Zee QFT in a nutshell book p.418, Zee said about Quark mass vs Lepton mass $m_d/m_e$
He first mentioned $m_d/m_e=1$ for unification scale.
Then he mentioned $m_d/m_e\sim 3 $ in eq.15.
Are these two facts contradicting each other? Generally, what can one say about the Quark mass vs Lepton mass in GUT or for unification scale?
It will be helpful to comment the text below with your explanations.
This post imported from StackExchange Physics at 2020-11-30 18:55 (UTC), posted by SE-user annie marie heart