دورية أكاديمية
The charm-quark contribution to light-by-light scattering in the muon $$(g-2)$$ ( g - 2 ) from lattice QCD
| العنوان: | The charm-quark contribution to light-by-light scattering in the muon $$(g-2)$$ ( g - 2 ) from lattice QCD |
|---|---|
| المؤلفون: | En-Hung Chao, Renwick J. Hudspith, Antoine Gérardin, Jeremy R. Green, Harvey B. Meyer |
| المصدر: | European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-15 (2022) |
| بيانات النشر: | SpringerOpen, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Astrophysics LCC:Nuclear and particle physics. Atomic energy. Radioactivity |
| مصطلحات موضوعية: | Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798 |
| الوصف: | Abstract We compute the hadronic light-by-light scattering contribution to the muon $$g-2$$ g - 2 from the charm quark using lattice QCD. The calculation is performed on ensembles generated with dynamical (u, d, s) quarks at the SU(3) $$_\mathrm{f}$$ f symmetric point with degenerate pion and kaon masses of around 415 MeV. It includes the connected charm contribution, as well as the leading disconnected Wick contraction, involving the correlation between a charm and a light-quark loop. Cutoff effects turn out to be sizeable, which leads us to use lighter-than-physical charm masses, to employ a broad range of lattice spacings reaching down to 0.039 fm and to perform a combined charm-mass and continuum extrapolation. We use the $$\eta _c$$ η c meson to define the physical charm-mass point and obtain a final value of $$a_\mu ^\mathrm{HLbL,c}= (2.8\pm 0.5) \times 10^{-11}$$ a μ HLbL , c = ( 2.8 ± 0.5 ) × 10 - 11 , whose uncertainty is dominated by the systematics of the extrapolation. Our result is consistent with the estimate based on a simple charm-quark loop, whilst being free of any perturbative scheme dependence on the charm mass. The mixed charm–light disconnected contraction contributes a small negative amount to the final value. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1434-6052 |
| Relation: | https://doaj.org/toc/1434-6052 |
| DOI: | 10.1140/epjc/s10052-022-10589-2 |
| URL الوصول: | https://doaj.org/article/c74e88ddd8c04be0b941a4b00ec38587 |
| رقم الأكسشن: | edsdoj.74e88ddd8c04be0b941a4b00ec38587 |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 14346052 |
|---|---|
| DOI: | 10.1140/epjc/s10052-022-10589-2 |