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Abstract
From perturbative QFT it is clear that a generic quantum filed\(\phi _i(x)\) contains both the annihilation operators of a type of particles and the creation operators of the corresponding antiparticles [4].
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Notes
- 1.
No tensor of rank should 2 be considered because its combination with an isospin 1/2 cannot get rise to an isospin 1/2.
- 2.
The Gordon identity establishes that
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Departamento de Física, Universidad de Murcia, Murcia, Spain
José Antonio Oller
- José Antonio Oller
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Correspondence toJosé Antonio Oller.
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Oller, J.A. (2019). Crossing. Crossed-Channel Singularities. In: A Brief Introduction to Dispersion Relations. SpringerBriefs in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-13582-9_3
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