粒子-反粒子混合产生准粒子与量子力学的局限性
Generation of quasiparticles by particle-antiparticle mixing and limitations of quantum mechanics
摘要：
中性不稳定粒子与其反粒子的混合问题在文献中通常是在量子力学的框架下讨论的。本文对量子场论中的粒子-反粒子混合作了全面的讨论，指出在这种混合存在的情况下，量子力学不是量子场论的非相对论极限。此外，它也表明，从量子力学和量子场论的结果之间确实存在着差异，这有时会使大的差异，如衰变宽度的观测量的理论预测。这一结果对中性介子的混合及其衰变过程中的CP破坏有一定的意义。
英文摘要：
The mixing of a neutral unstable particle and its antiparticle has been usually discussed in the framework of quantum mechanics in the literature. In this paper, the particle-antiparticle mixing is discussed fully in the quantum field theory, and it is shown that quantum mechanics is not the proper non-relativistic limit of the quantum field theory in the presence of such mixing. Moreover, it is also shown that a discrepancy indeed exists between the results from quantum mechanics and the quantum field theory, which can sometimes make big differences in theoretical predictions of observables such as decay widths. This result has an implication for the mixing of neutral mesons and the CP violation in their decays.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
