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The angular momentum of two massless fields revisited

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arxiv 1508.01394 v2 pith:UQTQZXMW submitted 2015-08-06 hep-ph hep-exhep-th

V. Pleitez This is my paper · ORCID
classification hep-phhep-exhep-th
keywords angularfieldslandaumasslessmomentumargumentsassumptionsavoided
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We consider the angular momentum of two massless fields using the Landau's arguments. In particular, we point out the explicit and implicit assumptions made by Landau to obtain the proof that a spin one system cannot decay into two photons. We show also under what conditions the result can be avoided.

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  1. Two-loop form factors for $P$-wave quarkonium production and decay

    hep-ph 2025-01 conditional novelty 8.0 of 10

    Analytic two-loop form factors for chi_{Q,J} production and decay are presented, including a new NRQCD singularity that couples P-wave states to the 3S1[8] configuration.

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