Reevaluation of the hadronic vacuum polarisation

Abstract

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 $e^{+} e^{-} \to hadrons$ cross-section data (among others) from the BABAR and VEPP-2000 experiments. For the muon $(g - 2) / 2$ we find for the lowest-order hadronic contribution $(693.1 \pm 3.4) \times 10^{- 10}$ , 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 $α (m_{Z}^{2})$ is evaluated to be $(276.0 \pm 0.9) \times 10^{- 4}$ .

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Title

Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g - 2 and α ( m Z 2 ) using newest hadronic cross-section data

Author

Davier, M¹; Hoecker, A²; Malaescu, B³; Zhang, Z¹

¹ Laboratoire de l’Accélérateur Linéaire, IN2P3-CNRS et Université Paris-Sud 11, Orsay Cedex, France
² CERN, Geneva 23, Switzerland
³ Laboratoire de Physique Nucléaire et des Hautes Energies, IN2P3-CNRS et Universités Pierre-et-Marie-Curie et Denis-Diderot, Paris Cedex 05, France

Pages

1-12

Publication year

2017

Publication date

Dec 2017

Publisher

Springer Nature B.V.

ISSN

14346044

e-ISSN

14346052

Source type

Scholarly Journal

Language of publication

English

DOI

https://doi.org/10.1140/epjc/s10052-017-5161-6

ProQuest document ID

1972951043

Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g - 2 and α ( m Z 2 ) using newest hadronic cross-section data

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Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g - 2 and α ( m Z 2 ) using newest hadronic cross-section data

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