A new evaluation of the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment and to α(mZ2)

被引：0

作者：

Davier, M. ^{[1
,2
]}

Hoecker, A. ^{[3
]}

Malaescu, B. ^{[4
]}

Zhang, Z. ^{[1
,2
]}

机构：

[1] Univ Paris Saclay, Lab Phys 2 Infinis Irene Joliot Curie, Orsay, France

[2] CNRS IN2P3, Orsay, France

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

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

来源：

EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 03期

关键词：

E(+)E(-) ANNIHILATION; CROSS-SECTION; ENERGY-RANGE;

D O I：

10.1140/epjc/s10052-020-7792-2

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：

We reevaluate the hadronic vacuum polarisation contributions to the muon magnetic anomaly and to the running of the electromagnetic coupling constant at the Z-boson mass. We include newest e+e--> hadrons cross-section data together with a phenomenological fit of the threshold region in the evaluation of the dispersion integrals. The precision in the individual datasets cannot be fully exploited due to discrepancies that lead to additional systematic uncertainty in particular between BABAR and KLOE data in the dominant pi+pi- channel. For the muon (g-2)/2, we find for the lowest-order hadronic contribution (694.0 +/- 4.0)center dot 10(-10). The full Standard Model prediction differs by 3.3 sigma from the experimental value. The five-quark hadronic contribution to alpha(m(Z)(2)) is evaluated to be (276.0 +/- 1.0)center dot 10(-4).

引用

页数：13

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