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- W3010899986 abstract "Over the past decade, the approach to the weak decays of heavy (D and B) mesons can be characterized by the birth of more or less sophisticated phenomenological models [1] dealing with the complexity of the strong-interaction dynamics. On the other hand, the current decade has witnessed the development of effective theories for the strong interaction (like the heavy-quark effective theory or HQET [2, 3]) coming from first principles, allowing very important phenomenological applications [4]. However, attention should still be paid to some formal aspects of the HQET as a proper quantum field theory as literature is sometimes confusing in this regard. In this paper, I shall examine some definitions for the effective fields describing heavy quarks according to the HQET, working out Feynman propagators from them. In particular I shall analyze their Fourier content in momentum space in the context of a quantum field theory. Let us suppose a generic hadron moving with four-velocity v (v 41), made of a heavy quark Q along with a light component. According to Georgi’s original remarks [5] the heavy quark becomes a cannonball conserving its velocity, almost the same as the hadron’s, unaltered as long as it interacts softly with the light degrees of freedom—without undergoing any weak or strong decay. Thereby, the heavy quark velocity can be viewed as a new label for heavy quarks, like flavour. It is customary to begin any pedagogical introduction to HQET by expressing the heavy-quark four-momentum pQ as the sum pQ4mQ v1kQ , where mQ v represents the" @default.
- W3010899986 created "2020-03-23" @default.
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- W3010899986 date "1997-03-01" @default.
- W3010899986 modified "2023-09-27" @default.
- W3010899986 title "A comment on heavy-quark effective fields" @default.
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