Intrinsic parity is the phase by which a field transforms under spatial inversion after its spacetime argument is reflected. For a Hermitian scalar field it is or .
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Intrinsic parity is a concept in particle physics that refers to a property of particles that characterizes their behavior under spatial inversion (or parity transformation). Parity transformation involves flipping the spatial coordinates, essentially transforming a point in space \((x, y, z)\) to \((-x, -y, -z)\). In terms of intrinsic parity, particles can be classified as having either positive or negative parity. This classification helps in understanding the symmetries and conservation laws of physical processes involving particles.