Heavy quark effective theory
In
Quantum chromodynamics (QCD) is the theory of strong force, through which quarks and gluons interact. HQET is the limit of QCD with the quark mass taken to infinity while its four-velocity is held fixed.[9] This approximation enables non-perturbative (in the strong interaction coupling) treatment of quarks that are much heavier than the QCD mass scale. The mass scale is of order 200 MeV. Hence the heavy quarks include charm, bottom and top quarks, whereas up, down and strange quarks are considered light. Since the top quark is extremely short-lived, only the charm and bottom quarks are of significant interest to HQET, of which only the latter has mass sufficiently high that the effective theory can be applied without major perturbative corrections.[2][3]
References
- ^ Heavy quarks, p. 10, CTEQ Summer School 2009, Illinois Institute of Technology, retrieved 2016-03-01.
- ^ ISBN 978-0-521-03757-0.
- ^ ISSN 0081-3869.
- ISSN 0370-2693.
- ISSN 0370-2693.
- ISSN 0370-2693.
- ^ Shifman, M.A., & Voloshin, M.V. (1987). On production of D and D* mesons in B-meson decays (ITEP--64(1987)). USSR
- ^ Georgi, H. (1991). TASI Lectures: Heavy Quark Effective Field Theory, retrieved 2016-03-01.
- ^ Heavy Quark Physics, Mark Wise, 1998
Further reading
- Shifman, M. A. (1999). "Lectures on Heavy Quarks in Quantum Chromodynamics". ITEP Lectures on Particle Physics and Field Theory. World Scientific Lecture Notes in Physics. Vol. 62. pp. 1–109. S2CID 18892623.
- Sommer, Rainer (2015). "Non-perturbative Heavy Quark Effective Theory: Introduction and Status". Nuclear and Particle Physics Proceedings. 261–262: 338–367. S2CID 53354994.
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