Nonabelian alpha_s^3/(m_q r^2) heavy-quark-antiquark potential

Details Nonabelian alpha_s^3/(m_q r^2) heavy-quark-antiquark potential Nonabelian alpha_s^3/(m_q r^2) heavy-quark-antiquark potential

2001-06-13

arxiv.org/abs/hep-ph/0106135v1

Phys.Rev.D65:091503,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages (Latex)

Scientific paper

10.1103/PhysRevD.65.091503

We calculate the leading mass-suppressed two-loop contribution, proportional to alpha_s^3/(m_q r^2), to the potential of a heavy quark-antiquark system. This contribution originates in the nonabelian nature of quantum chromodynamics (QCD) and has no analogue in quantum electrodynamics (QED). For this purpose, we elaborate a technique based on the implementation of the threshold expansion within the effective theory of nonrelativistic QCD (NRQCD). We discuss phenomenological implications of our result for heavy-quarkonium physics. We also confirm a previous result for the two-loop O(alpha_s^2) correction to the static potential.

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