20–27 juil. 2011
Alpes Congrès - Alpexpo
Fuseau horaire Europe/Paris

F_\pi, \Lambda_MS and the Chiral Condensate from Renormalization Group Optimized Perturbation

22 juil. 2011, 11:00
15m
Bayard (Alpes Congrès - Alpexpo)

Bayard

Alpes Congrès - Alpexpo

Parallel session talk QCD QCD

Orateur

Dr Jean-Loic Kneur (LCC Montpellier)

Description

A recent extension of a variationally optimized perturbation method, combined with renormalization group properties in a straightforward way, can provide a series of approximations to nonperturbative quantities such as the chiral symmetry breaking order parameters. We apply this to evaluate, up to the third order in this modified perturbation, the ratio F_\pi/\Lambda_MS where F_\pi is the pion decay constant and \Lambda_MS the basic QCD scale in the MS scheme. We also obtain from a similar approach the chiral quark condensate. We compare our estimates of \Lambda_MS and the chiral condensate with recent lattice calculation results.

Auteurs principaux

Dr Andre Neveu (LCC Montpellier) Dr Jean-Loic Kneur (LCC Montpellier)

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