Average Kinetic Energy of Heavy Quark and Virial Theorem

Abstract

We derive the virial theorem of the relativistic two-body system for the study of the B-meson physics. It is also shown that the solution of the variational equation always satisfies the virial theorem. From the virial theorem we also obtained ${\mu }_{\pi }^2\equiv -{\lambda }_1\equiv <p^2>=0.40\sim 0.58$ GeV${}^2$, which is consistent with the result of the QCD sum rule calculations of Ball $et$ $al.$

Comments: 13 pages. A lot of parts of the manuscript have been revised. To appear in Physics Letters B