NRQCD, effective field theories and potential models
نویسندگان
چکیده
منابع مشابه
NRQCD, Effective Field Theories and Potential Models
The study of the heavy quark–antiquark system is an old topic (see [1] for earlier references). Here we will concentrate on recent developments based on effective field theories. For large enough masses, these systems can be considered to be non-relativistic (NR) and are then characterized by, at least, three widely separated scales: hard (the mass m, of the heavy quarks), soft (the relative mo...
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Vacuum energies are computed in light-cone field theories to obtain effective potentials which determine vacuum condensate. Quantization surfaces interpolating between the light-like surface and the usual spatial one are useful to define the vacuum energies unambiguously. The GrossNeveu, SU(N) Thirring, and O(N) vector models are worked out in the large N limit. The vacuum energies are found to...
متن کاملDecay Properties of QQ̄ Mesons in Potential Models and Effective Field Theories
The decay rates of QQ̄ mesons (Q ε c,b) are studied in the NRQCD formalism in terms of their short distance and long distance coefficients. The long distance coefficients are obtained through phenomenological potential model description of the mesons. The mass spectrum of the cc̄ and bb̄ mesons are reviewed in non-relativistic phenomenological quark antiquark potential of the type V (r) = −αc r + ...
متن کاملEffective Field Theory for Ultrasoft Momenta in NRQCD and NRQED
Two particle non-relativistic bound states in QCD (QED) have, at least, three well separated scales: the mass m (hard scale), the typical relative momentum |~ p| (soft scale) and the typical bound state energy E (ultrasoft scale). This allows to introduce a hierarchy of effective field theories when sequentially integrating out each of these scales. After integrating out the hard scale m QCD (Q...
متن کاملEffective Field Theories
Three lectures in which I give an introduction to effective field theories in particle physics.
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2001
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(00)01100-2