Perturbative versus non-perturbative decoupling of heavy quarks

2015/11/16 by Knechtli, Francesco, Bruno, Mattia, Finkenrath, Jacob +2
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1511.04914

Abstract

We simulate a theory with N_f=2 heavy quarks of mass M. At energies much smaller than M the heavy quarks decouple and the theory can be described by an effective theory which is a pure gauge theory to leading order in 1/M. We present results for the mass dependence of ratios such as t₀(M)/t₀(0). We compute these ratios from simulations and compare them to the perturbative prediction. The latter relies on a factorisation formula for the ratios which is valid to leading order in 1/M.

Related

• Matching Perturbative and Non-Perturbative Physics With Power Accuracy in Heavy-Quark Effective Theory
• Physical and cut-off effects of heavy sea quarks
• Perturbative heavy quark-antiquark systems
• Matching to all orders and power corrections in heavy quark effective theory
• High order PT calculations for heavy quarks near threshold