Update on the hadronic vacuum polarisation contributions to muon $g − 2$ and $\alpha(m_Z^2)$
| Autor: | Zhiqing Philippe Zhang |
|---|---|
| Přispěvatelé: | Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Particle physics
talk: Mainz 2017/06/26 QC1-999 Electron–positron annihilation Hadron anomaly electron positron: annihilation Z0: mass 01 natural sciences Standard Model 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] 010306 general physics numerical calculations Boson Coupling constant Physics Muon muon: magnetic moment 010308 nuclear & particles physics higher-order: 0 vacuum polarization: hadronic High Energy Physics::Phenomenology coupling constant electromagnetic cross section: hadronic [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] BaBar Novosibirsk VEPP-2000 High Energy Physics::Experiment hadron Anomaly (physics) |
| Zdroj: | EPJ Web Conf. International Workshop on e$^+$e$^-$ Collisions from Phi to Psi International Workshop on e$^+$e$^-$ Collisions from Phi to Psi, Jun 2017, Mainz, Germany. pp.01002, ⟨10.1051/epjconf/201921801002⟩ PoS 2017 European Physical Society Conference on High Energy Physics 2017 European Physical Society Conference on High Energy Physics, Jul 2017, Venice, Italy. pp.251, ⟨10.22323/1.314.0251⟩ EPJ Web of Conferences, Vol 218, p 01002 (2019) |
| DOI: | 10.1051/epjconf/201921801002⟩ |
| Popis: | An update of the hadronic vacuum polarisation contributions to the muon magnetic anomaly and to the running of the electromagnetic couplings constant at the Z-boson mass is presented. Newest e+e−→ hadrons cross-section data mainly from the BABAR and VEPP-2000 experiments have been included. For the muon (g−2)/2, the lowest-order hadronic contribution is evaluated to be (693.1 ± 3.4) · 10−10, improving the precision of our previous evaluation by 21%. The full Standard Model prediction differs by 3.5 σ from the experimental value. The five-quark hadronic contribution to $ \alpha (\mathop m\nolimits_z^2 ) $ is evaluated to be (276.0 ± 0.9) · 10−4. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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