20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

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

22 Jul 2011, 11:00
Bayard (Alpes Congrès - Alpexpo)


Alpes Congrès - Alpexpo

Parallel session talk QCD QCD


Dr Jean-Loic Kneur (LCC Montpellier)


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.

Primary authors

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

Presentation Materials