Tensions in e+e- → π + π-(γ )measurements: the new landscapeof data-driven hadronic vacuum polarization predictions for the muon g-2

被引：0

作者：

Davier, Michel ^{[1
,2
]}

Hoecker, Andreas ^{[3
]}

Lutz, Anne-Marie ^{[1
,2
]}

Malaescu, Bogdan ^{[4
]}

Zhang, Zhiqing ^{[1
,2
]}

机构：

[1] Univ Paris Saclay, IJCLab, Orsay, France

[2] CNRS, IN2P3, Orsay, France

[3] CERN, CH-1211 Geneva 23, Switzerland

[4] Univ Paris Cite, Sorbonne Univ, LPNHE, CNRS,IN2P3, Paris, France

来源：

EUROPEAN PHYSICAL JOURNAL C | 2024年 / 84卷 / 07期

关键词：

ANOMALOUS MAGNETIC-MOMENT; ELECTROWEAK RADIATIVE-CORRECTIONS; VACUUM POLARIZATION CONTRIBUTIONS; CROSS-SECTION; MONTE-CARLO; HADRONIC CONTRIBUTION; MESON CONTRIBUTIONS; SPECTRAL FUNCTIONS; FINAL-STATES; FORM-FACTOR;

D O I：

10.1140/epjc/s10052-024-12964-7

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The situation of the experimental data used in the dispersive evaluation of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is assessed in view of two recent measurements: (+-)-> (+-) cross sections in the resonance region by CMD-3 and a study of higher-order radiative effects in the initial-state-radiation processes (+-)-> (+-) and (+-)-> (+-) by BABAR. The impact of the latter study on the KLOE and BESIII cross-section measurements is evaluated and found to be indicative of larger systematic effects than uncertainties assigned. The new situation also warrants a reappraisal of the independent information provided by hadronic decays, including state-of-the-art isospin-breaking corrections. The findings cast a new light on the longstanding deviation between the muon g - 2 measurement and the Standard Model prediction using the data-driven dispersive approach, and the comparison with lattice QCD calculations.

引用

页数：16

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