# Thread: Electric Charge in the Standard Model of particle physics

1. Hi!

The following asks a basic question in the Standard Model of particle physics, Any answers?

"Should the Standard Model of Particle Physics Have Merely a Conventional Definition of the Electric Charge ?"

( for further discussion see: vixra.org/abs/1409.0118 )
Syed Afsar Abbas  2. "Should the Standard Model of Particle Physics Have Merely a Conventional Definition of the Electric Charge ?"
I don't know what you mean by "conventional definition", but in particle physics charge arises naturally as the conserved Noether current associated with the gauge invariance of the electromagnetic field, specifically the invariance of the squared norm of the wave function of a charged particle under phase shifts. This is mathematically rigorous through Noether's theorem, and works very well.  3. Electric Charge in the Standard Model of particle physics
Yes. However Noether Theorem says nothing about quantization of the electric charge.
Quantization means, why is u-quark charge -2/3 of the electronic charge etc ?
in the Standard Model of Particle Physics, this is defined quite arbitrarily. There are, in practice,
two popular conventions: Q= T3 + Y/2 and Q= T3 + Y" , where T3 and (Y or Y") are generators
of the Electro-Weak group SU(2)XU(1) respectively. Next Y and Y" are arbirarily put in by hand to
match the experiemental numbers for the various charges.

This, for a fundamental and as successful a thoery as the Standard Model, is highly unsatisfactory.
Clearly something is amiss in our understanding.  4. Originally Posted by Abbas in the Standard Model of Particle Physics, this is defined quite arbitrarily.
This is how the Standard Model is constructed, there is no secret about it. Your paper offers no explanation.  