SciPost Submission Page
Perturbative heavy quark contributions to the anomalous magnetic moment of the muon
by P. D. Kennedy, J. Erler and H. Spiesberger
Submission summary
Authors (as registered SciPost users): | Philip David Kennedy |
Submission information | |
---|---|
Preprint Link: | scipost_202111_00050v1 (pdf) |
Date submitted: | 2021-11-23 20:03 |
Submitted by: | Kennedy, Philip David |
Submitted to: | SciPost Physics Proceedings |
Proceedings issue: | 16th International Workshop on Tau Lepton Physics (TAU2021) |
Ontological classification | |
---|---|
Academic field: | Physics |
Specialties: |
|
Approach: | Phenomenological |
Abstract
We discuss a method for calculating the heavy quark vacuum polarisation contribution to the muon anomalous magnetic moment, $a_\mu$, using perturbative QCD. This approach is independent of $e^+e^-$ cross-section data allowing a fully theoretical evaluation of these contributions. We confirm an existing result at lower orders in $\alpha_s$ and state a new explicit analytic formula which includes terms up to $\order{\alpha_s^3}$. Numerically the charm quark contribution to $a_\mu$ is found to be $a_\mu^c = (14.5 \pm 0.2)\times 10^{-10}$ and the bottom contributes $a_\mu^b = (0.302 \pm 0.002) \times 10^{-10} $. Our uncertainty estimates include both parametric uncertainties from $\hat{m}_q(\hat{m}_q)$ and $\alpha_s(\hat{m}_q)$, and theoretical uncertainties in the perturbative expansion. Comparison is made between these results and alternative approaches such as lattice QCD or those based on a dispersion relation and cross-section data.