SciPost Submission Page
Experimental input for $e^+e^-$ for $a_{\mu}$ light-by-light
by Y. P. Guo for BESIII Collaboration
This is not the latest submitted version.
Submission summary
| Authors (as registered SciPost users): | Yuping Guo |
| Submission information | |
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| Preprint Link: | scipost_201811_00012v1 (pdf) |
| Date submitted: | Nov. 11, 2018, 1 a.m. |
| Submitted by: | Yuping Guo |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | The 15th International Workshop on Tau Lepton Physics (TAU2018) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
The anomalous magnetic momentum of the muon, $a_{\mu}$, has been measured and calculated with a precision up to $~0.5$ ppm, but there is a 3 to 4 standard deviations between these two values. The uncertainty in the calculation is dominated by the hadronic part, including the hadronic vacuum polarization and the hadronic light-by-light. The meson transition form factors and the helicity amplitudes can be used as input or constraint to the calculation of the hadronic light-by-light contribution. Latest experimental studies of the transition form factors of $\pi^{0}$, $\eta$, and $\eta^{\prime}$ and the cross-section of $\gamma\gamma^{*}\to\pi^+pi^-$ from $e^+e^-$ collider are presented.
Current status:
Reports on this Submission
Report #1 by Gerco Onderwater (Referee 1) on 2018-12-4 (Invited Report)
- Cite as: Gerco Onderwater, Report on arXiv:scipost_201811_00012v1, delivered 2018-12-04, doi: 10.21468/SciPost.Report.701
Report
Minor changes to the content, esp. grammar, would improve the already high quality of the paper.
Requested changes
L28: "with a statistical precision of 0.54 ppm" -> that is the total uncertainty L34: "The QED contribution is the largest one, AND has been calculated up to 5-loop in perturbation theory with a precision of 0.0007 ppm" -> grammar L35: "The weak contribution is small, IT has been calculated to 2-loop, with the measured Higgs mass taken into account [8], and its uncertainty is well under control." -> grammar; remove 'it' L43: "... can be related to the hadronic cross-section ..." -> which hadronic cross section? There is no THE hadronic one. L45: "MEANwhile the situation for the HLbL part is different." L72: "The BEPCII is a τ-charm factory THAT works with center-of-mass (CM) energy from 2.0 73 GeV to 4.6 GeV. " L154-162: its not clear how to interpret the chi-squared, as the values are nowhere near 1. Some notion about the number of degrees of freedom is warranted, or a statement that only relative chi^2's are used.
Author: Yuping Guo on 2018-12-05 [id 365]
(in reply to Report 1 by Gerco Onderwater on 2018-12-04)Changes have been made according to the suggestions from referee