Study of the resummation of chiral logarithms in the
نویسنده
چکیده
From the properties of analyticity and unitarity it has been recently obtained an exponentiated expression for the pion form factor. In this work I show the validity of this expression comparing its order p6 term with the one exactly calculated in ChPT. PACS numbers: 14.40.Aq, 13.40.Gp, 13.60.Fz, 12.39.Fe
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 کاملNon-global logarithms and jet algorithms in high-pT jet shapes
We consider jet-shape observables of the type proposed recently [1, 2] where the shapes of one or more high-pT jets, produced in a multi-jet event with definite jet multiplicity, may be measured leaving other jets in the event unmeasured. We point out the structure of the full next-to–leading logarithmic resummation specifically including resummation of non-global logarithms in the leading-Nc l...
متن کاملResummation of Large Logarithms within the Method of Effective Charges
We show how the resummation of large logarithms can be incorporated into the method of effective charges. As an example, we apply this approach to the event shape variables thrust and heavy-jet mass in ee annihilation. We find that, although the resummation creates problems with the behaviour of the effective charge in the 2-jet limit, smaller power corrections are required to fit the data comp...
متن کاملComputational study in Regioselectivie Synthesis of New Spiro-oxindolopyrrolidines
One-pot, four-component procedure for the synthesis of a small library of new chiral spiro- oxindolopyrrolidines with high regio-, diastereo- (>99:1 dr), and enantioselectivity (up to 80% ee) is described. In this process, the regio- and stereochemical 1,3-dipolar cycloaddition of azomethine ylides, which were generated insitu by the reaction of isatin derivatives and sarcosin,with optically ac...
متن کامل43 9 v 1 2 2 A ug 1 99 7 1 EDINBURGH 97 / 14 Resummation of next - to - leading logarithms in top quark production 1
We discuss the resummation of next-to-leading logarithms (NLL) in heavy quark production near threshold. Results are presented for top quark production at the Fermilab Tevatron.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997