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In the book A Introductory Course Of Particle Physics by Palash B. Pal, the author claims the following (on page 167, section 6.4.3)

For single-particle systems, intrinsic parity is the only contribution to parity. For multi-particle systems, however, there are other contributions.

However, in addition to intrinsic parity coming from spin, orbital parity can arise for single-particle states if it carries an orbital angular momentum such as photons. See the questions below

  1. What is the orbital angular momentum (OAM) of individual photons?
  2. Does orbital angular momentum has no meaning for single photons?

Is it true that for single-particle systems, intrinsic parity is the only contribution to parity?

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