By Andrey G. Grozin

This up to date evaluate additionally serves as an advent to Heavy Quark potent conception (HQET) - a brand new method of heavy quark physics difficulties in Quantum Chromodynamics (QCD). Heavy quark physics is likely one of the such a lot lively components of high-energy physics, specially at present whilst B-factories at SLAC and KEK are generating top of the range effects, and but different amenities are being constructed. HQET has already ended in major growth in our figuring out of heavy quark physics over the last 10 years. The booklet additionally includes a distinctive dialogue of the tools of calculation utilized in HQET, besides a number of illustrations.

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Extra resources for Heavy Quark Effective Theory (Springer Tracts in Modern Physics)

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In HQET, hybrid logarithms become ultraviolet logarithmic divergences governed by the renormalization group, with corresponding anomalous dimensions. 2) possesses the SU (2) heavy-quark spin symmetry [9]. If there are nh heavy-quark fields with the same velocity, it has the ¯ D ¯∗ SU (2nh ) spin–flavour symmetry. For example, if we consider the B → D, transitions with v = v, to the leading order in 1/mc,b , then the Lagrangian has SU (4) spin–flavour symmetry, which relates all form factors to the B → B form factor at zero momentum transfer, which is equal to 1.

1 Renormalization of QCD 37 The term with c1 can be absorbed by a rescaling of µ; therefore, we shall assume c1 = 0. 5) with a new β (αs ): β0 = β0 , β1 = β1 , β2 = β2 + c2 , . . The first two β-function coefficients β0,1 are the same in all mass-independent (or minimal) schemes; the higher coefficients β2,3,... ). In this book, we shall always use the MS scheme. The information contained in Zα is equivalent to that in β(αs ). 8) where Z1 starts from the order αs , Z2 starts from α2s , and so on. Then dZα1 = −β(αs ) , d log αs dZα2 = β 2 (αs ) , d log αs dZα3 = −β 3 (αs ) , .

19) One can obtain the anomalous dimension γ(αs ) from Z1 , the coefficient of 1/ε in Z, and vice versa. The coefficients Z2 , Z3 , . . contain no new information; at each order in αs , they can be reconstructed from lower-loop results. 2 Gluon Propagator The bare (unrenormalized) gluon propagator −iDµν (p) has the structure (Fig. 21) is the free gluon propagator, and the gluon self-energy (polarization operator) iΠµν (p) is the sum of one-particle-irreducible gluon self-energy diagrams (which cannot be separated into two disconnected parts by cutting a single gluon line).

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