query: Pair-annihilation why does it occour?
positive_passages.docid: 149215
positive_passages.text: Does a particle annihilate only with its antiparticle? If yes, why?
negative_passages.docid: 20067
negative_passages.text: What is the mechanism of particle anti-particle annihilation
negative_passages.docid: 90250
negative_passages.text: Two explanations of non-zero atomic radius
negative_passages.docid: 130255
negative_passages.text: Why doesn't a typical beam splitter cause a photon to decohere?
negative_passages.docid: 19133
negative_passages.text: Why/How is this Wick's theorem?
negative_passages.docid: 111934
negative_passages.text: Does the Pauli exclusion principle instantaneously affect distant electrons?
negative_passages.docid: 119058
negative_passages.text: Strange phenomenon with Outer
negative_passages.docid: 34004
negative_passages.text: Why is time evolution unitary?
negative_passages.docid: 65831
negative_passages.text: Understanding type of force interaction in particle decays
negative_passages.docid: 31390
negative_passages.text: What prevents photons from getting mass from higher order Feynman diagrams
negative_passages.docid: 94230
negative_passages.text: I want to understand a trick in the derivation of the Schwinger-Dyson equations
negative_passages.docid: 104852
negative_passages.text: Why can't a spin-1 particle decay into two identical spin-0 particles?
negative_passages.docid: 61304
negative_passages.text: Normal ordering of the commutator between annihilation and creation operator
negative_passages.docid: 88637
negative_passages.text: Why can a particle decay into two photons but not one?
negative_passages.docid: 71626
negative_passages.text: Superposition of distinct vevs in spontaneous symmetry breaking
negative_passages.docid: 73049
negative_passages.text: Quantum Zeno effect and unstable particles
negative_passages.docid: 100748
negative_passages.text: Probability, quantum physics, and why (can't it/does it) apply to macroscale events?