منابع مشابه
A renormalizable effective theory for leading logarithms in ChPT
The theory of the strong interaction, Quantum Chromo Dynamics, does not allow the application of the powerful perturbation techniques in the low–energy region. It is however possible to use the symmetries of QCD to construct an effective theory in the low–energy region, chiral perturbation theory (ChPT) [1–3], which allows a systematic perturbative expansion of Green functions in powers of exte...
متن کاملBeyond Leading Logarithms
The renormalization group evolution of ∆B = 2 transition operators is studied at leading order in heavy quark effective theory and at next-to-leading order in QCD. We calculate new contributions that were not taken into account in previous work and obtain the complete result to next-to-leading logarithmic accuracy. The various scheme and scale dependences and their cancellation in physical quan...
متن کاملDecays Beyond Leading Logarithms
Using the next-to-leading order low energy effective Hamiltonian for |∆B| = 1, ∆C = ∆U = 0 transitions, the contributions of electroweak penguin operators in B−(B0 d) → PP and PV decays are estimated in the standard model. We find that, for some channels, the electroweak penguin effects can enhance or reduce the QCD penguin and/or tree level contributions by at least 30%, and can even play domi...
متن کاملWeak Decays beyond Leading Logarithms
We review the present status of QCD corrections to weak decays beyond the leading logarithmic approximation including particle-antiparticle mixing and rare and CP violating decays. After presenting the basic formalism for these calculations we discuss in detail the effective hamiltonians for all decays for which the next-to-leading corrections are known. Subsequently, we present the phenomenolo...
متن کاملSuper-leading Logarithms in Gaps-between-jets
The resummation of large logarithms associated with wide angle soft gluon emissions has been investigated for the last 20 years. For certain observables the contributions from non-global logarithms 1 have to be taken into account. One of the simplest of these non-global observables is the ‘gaps-between-jets’ cross-section. This is the cross-section for producing a pair of high transverse moment...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics A
سال: 1999
ISSN: 0217-751X,1793-656X
DOI: 10.1142/s0217751x99000907