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## Main Question or Discussion Point

At page 52 of 4th chapter in "An Introduction to gauge theories & modern particle physics" by Leader & Predazzi one can find such statement:

"We must therefore rearrange (4.2.4) so that we can identify the field that multiplies[tex]\frac{1}{2}\left(1+\tau_{3}\right)[/tex] as gauge boson that remains massless i.e. as photon"

But I still don't understand why such field is needed and what it mean that "field multiplies (transformation mentioned above) as gauge massles boson". For me this statement sounds "slangish".

Next question: unbroken generator - what's that? And for what purpose one impose condition(4.2.8)

I will appreciate any kind of advice.

"We must therefore rearrange (4.2.4) so that we can identify the field that multiplies[tex]\frac{1}{2}\left(1+\tau_{3}\right)[/tex] as gauge boson that remains massless i.e. as photon"

But I still don't understand why such field is needed and what it mean that "field multiplies (transformation mentioned above) as gauge massles boson". For me this statement sounds "slangish".

Next question: unbroken generator - what's that? And for what purpose one impose condition(4.2.8)

I will appreciate any kind of advice.

*QuantumDevil.*