منابع مشابه
Power Counting and β Function in NRQCD
A computation of the NRQCD β function both in the Lorentz gauge family and in the Coulomb gauge to one loop order endorses a velocity power counting scheme for dimensionally regularised NRQCD. In addition to the ultrasoft scale represented by bremsstrahlung gluons and the potential scale with Coulomb gluons and on-shell quarks, a soft régime is identified in which energies and momenta are of or...
متن کاملPower Counting in Dimensionally Regularized NRQCD
We present a scheme for calculating in NRQCD with consistent power counting in the heavy quark velocity v. As an example, we perform the systematic matching of an external current onto NRQCD at subleading order in v, a calculation relevant for the process ee → hadrons near threshold. Consistent velocity power counting in dimensional regularization is achieved by including two distinct gluon fie...
متن کاملThe Soft Régime and β Function of NRQCD
Progress towards a complete velocity power counting in non-relativistic effective field theories, especially NRQCD, is motivated and summarised. Talk presented at the “Euroconference QCD ’98” in Montpellier, France, 2nd – 8th July 1998 (to appear in Nucl. Phys. B(Proc. Suppl.)), and at the conference “Quark Confinement and the Hadron Spectrum III” at TJNL, Newport News, USA, 8th – 12th June 199...
متن کاملHephy-pub 697/98 the Quark-antiquark Wilson Loop Formalism in the Nrqcd Power Counting Scheme
The quark-antiquark interaction from the NRQCD Lagrangian is studied in the Wilson loop formalism. 1. The NRQCD Lagrangian Large radii quarkonia (i.e. excited heavy mesons like b̄b and c̄c) cannot be described in terms of perturbative QCD with the addition of leading nonperturbative effects encoded into local condensates. This happens since in this situation the gluonic correlation length cannot ...
متن کاملcompactifications and function spaces on weighted semigruops
chapter one is devoted to a moderate discussion on preliminaries, according to our requirements. chapter two which is based on our work in (24) is devoted introducting weighted semigroups (s, w), and studying some famous function spaces on them, especially the relations between go (s, w) and other function speces are invesigated. in fact this chapter is a complement to (32). one of the main fea...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2000
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(99)00325-9