Particles and antiparticles in compex field

[spookyfish]

Hi. I am confused about something related to the creation of particles/antiparticles in a complex scalar field.
I read in the literature that \phi(x)|0\rangle describes the creation of a particle at point x. But given that

\phi(x) = \int \frac{d^3 p}{\sqrt{(2\pi)^3 2E_p}} \left(a(p)e^{-ipx}+b^\dagger (p)e^{ipx}\right)

then in \phi(x)|0\rangle only the b^\dagger(p) term contributes, i.e.

\phi(x)|0\rangle= \int \frac{d^3 p}{\sqrt{(2\pi)^3 2E_p}}e^{ipx} b^\dagger(p)|0\rangle

from which it seems that an anti-particle (created by b^\dagger(p)) is created at x.

 

[fzero]

We don't have the original text that you read around to nitpick, but if $\phi(x)$ creates the antiparticle, then $\phi^\dagger(x)$ creates the particle. The original reference could have been

1. sloppy
2. using a different definition of particle vs antiparticle
3. referring to a real scalar field

etc. We simply can't be sure without knowing precisely what you read and the context in which the author stated that.

 

[spookyfish]

Thanks. In fact, my problem was with something I read in the internet related to the literature, and I think it was simply wrong, so the definitions I wrote above work.