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Measurement of the e+e- -> π+π- cross section by the CMD-3 experiment and its implication to the hadronic contribution to muon (g-2)

by Dr Fedor Ignatov (University of Liverpool)

→ Europe/Rome
Description
Abstract:  One of the sensitive probes of the Standard Model is the anomalous magnetic moment of the muon aµ = (gµ − 2)/2, where all known interactions contribute to that value. There exists a long-standing 3-5σ deviation between the experimental measurement and the theoretical prediction. The conventional approach to calculate the hadronic part of the muon g-2 is based on the low energy e+e- -> hadrons experimental data via the dispersion integral relations.
The major part of the hadronic contribution comes from the π+π− channel, which also determines the overall precision of the data-driven theoretical prediction of the muon anomaly value. The latest measurement of the e+ e- → π+ π- cross section was performed by the CMD-3 experiment at the electron-positron collider VEPP-2000. This analysis was based on the biggest ever used collected statistics of π+ π- production at the rho resonance region. 
The details of this analysis will be presented. The implications of this measurement on the landscape of the theoretical prediction of the anomalous magnetic moment of the muon will be also discussed.

 


 

Coordinate ZOOM
 

ee_2pi_g2_7May2024_Pisa.pdf
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