Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$

We calculate (g-2) of the muon and the QED coupling alpha(M_Z^2), by improving the determination of the hadronic vacuum polarization contributions and their uncertainties. We include the recently re-analysed CMD-2 data on e^+e^- -> pi^+ pi^-. We carefully combine a wide variety of data for the e^...

Descripción completa

Detalles Bibliográficos
Autores principales: Hagiwara, K, Martin, A D, Nomura, D, Teubner, T
Lenguaje:eng
Publicado: 2003
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.69.093003
http://cds.cern.ch/record/693396
_version_ 1780902145354104832
author Hagiwara, K
Martin, A D
Nomura, D
Teubner, T
author_facet Hagiwara, K
Martin, A D
Nomura, D
Teubner, T
author_sort Hagiwara, K
collection CERN
description We calculate (g-2) of the muon and the QED coupling alpha(M_Z^2), by improving the determination of the hadronic vacuum polarization contributions and their uncertainties. We include the recently re-analysed CMD-2 data on e^+e^- -> pi^+ pi^-. We carefully combine a wide variety of data for the e^+e^- production of hadrons, and obtain the optimum form of R(s) = sigma_had^0(s)/sigma_pt(s), together with its uncertainty. Our results for the hadronic contributions to g-2 of the muon are a_mu^(had, LO) = (692.4 +- 5.9_exp +- 2.4_rad) * 10^(-10) and a_mu^(had, NLO) = (-9.8 +- 0.1_exp +- 0.0_rad) * 10^(-10), and for the QED coupling Delta alpha^(5)_had (M_Z^2)= (275.5 +- 1.9_exp +- 1.3_rad) * 10^(-4). These yield (g-2)/2 = 0.00116591763(74), which is about 2.4 sigma below the present world average measurement, and alpha(M_Z^2)^(-1) = 128.954 +- 0.031. We compare our (g-2) value with other predictions and, in particular, make a detailed comparison with the latest determination of (g-2) by Davier et al.
id cern-693396
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
record_format invenio
spelling cern-6933962019-09-30T06:29:59Zdoi:10.1103/PhysRevD.69.093003http://cds.cern.ch/record/693396engHagiwara, KMartin, A DNomura, DTeubner, TPredictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$Particle Physics - PhenomenologyWe calculate (g-2) of the muon and the QED coupling alpha(M_Z^2), by improving the determination of the hadronic vacuum polarization contributions and their uncertainties. We include the recently re-analysed CMD-2 data on e^+e^- -> pi^+ pi^-. We carefully combine a wide variety of data for the e^+e^- production of hadrons, and obtain the optimum form of R(s) = sigma_had^0(s)/sigma_pt(s), together with its uncertainty. Our results for the hadronic contributions to g-2 of the muon are a_mu^(had, LO) = (692.4 +- 5.9_exp +- 2.4_rad) * 10^(-10) and a_mu^(had, NLO) = (-9.8 +- 0.1_exp +- 0.0_rad) * 10^(-10), and for the QED coupling Delta alpha^(5)_had (M_Z^2)= (275.5 +- 1.9_exp +- 1.3_rad) * 10^(-4). These yield (g-2)/2 = 0.00116591763(74), which is about 2.4 sigma below the present world average measurement, and alpha(M_Z^2)^(-1) = 128.954 +- 0.031. We compare our (g-2) value with other predictions and, in particular, make a detailed comparison with the latest determination of (g-2) by Davier et al.hep-ph/0312250CERN-TH-2003-162DCPT-2003-82IPPP-2003-41KEK-TH-902LTH-613oai:cds.cern.ch:6933962003-12-18
spellingShingle Particle Physics - Phenomenology
Hagiwara, K
Martin, A D
Nomura, D
Teubner, T
Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$
title Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$
title_full Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$
title_fullStr Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$
title_full_unstemmed Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$
title_short Predictions for g-2 of the muon and $\alpha_{QED}(M_{Z}^{2})$
title_sort predictions for g-2 of the muon and $\alpha_{qed}(m_{z}^{2})$
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.69.093003
http://cds.cern.ch/record/693396
work_keys_str_mv AT hagiwarak predictionsforg2ofthemuonandalphaqedmz2
AT martinad predictionsforg2ofthemuonandalphaqedmz2
AT nomurad predictionsforg2ofthemuonandalphaqedmz2
AT teubnert predictionsforg2ofthemuonandalphaqedmz2

Ejemplares similares