Two-Loop QCD Corrections to the Heavy Quark Form Factors: Anomaly Contributions

Details Two-Loop QCD Corrections to the Heavy Quark Form Factors: Anomaly Contributions Two-Loop QCD Corrections to the Heavy Quark Form Factors: Anomaly Contributions

2005-04-21

arxiv.org/abs/hep-ph/0504190v1

Nucl.Phys. B723 (2005) 91-116

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 6 figures

Scientific paper

10.1016/j.nuclphysb.2005.06.025

We present closed analytic expressions for the order $\alpha_s^2$ triangle diagram contributions to the matrix elements of the singlet and non-singlet axial vector currents between the vacuum and a quark-antiquark state. We have calculated these vertex functions for arbitrary momentum transfer and for four different sets of internal and external quark masses. We show that both the singlet and non-singlet vertex functions satisfy the correct chiral Ward identities. Using the exact expressions for the finite axial vector form factors, we check the quality and the convergence of expansions at production threshold and for asymptotic energies.

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