Heavy quark mass expansion and intrinsic charm in light hadrons

Details Heavy quark mass expansion and intrinsic charm in light hadrons Heavy quark mass expansion and intrinsic charm in light hadrons

2000-02-23

arxiv.org/abs/hep-ph/0002240v1

Phys.Rev. D62 (2000) 074024

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, no figures

Scientific paper

10.1103/PhysRevD.62.074024

We review the technique of heavy quark mass expansion of various operators made of heavy quark fields using a semiclassical approximation. It corresponds to an operator product expansion in the form of series in the inverse heavy quark mass. This technique applied recently to the axial current is used to estimate the charm content of the \eta, \eta' mesons and the intrinsic charm contribution to the proton spin. The derivation of heavy quark mass expansion for Qbar \gamma_5 Q is given here in detail and the expansions of the scalar, vector and tensor current and of a contribution to the energy-momentum tensor are presented as well. The obtained results are used to estimate the intrinsic charm contribution to various observables.

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