The 18th International Workshop on Tau Lepton Physics (TAU2025)

New precise measurement of e+e- to pi+pi- with BABAR for muon g-2 prediction

21 Oct 2025, 10:10

20m

Amphitheatre Gastaut (Marseille)

Talk g-2 Plenary session

Speaker

Dr Léonard POLAT (LPNHE-Paris/IJClab-Orsay)

Description

A measurement of the key cross section e+e- to pi+pi- for hadronic vacuum polarization (HVP)is presented with the full BABAR statistics using a new method not relying on particle ID to separate pions ans muons, therefore independent from the 2009 analysis. This result should play an important role to clarify the presently rather confused situation where large discrepancies are observed between the extreme results from KLOE and CMD-3, preventing an average of e+e- to pi+pi- cross sections to compute the HVP contribution to the muon g-2.

Presentation materials

TAU2025_BaBar_Polat.pdf

Peer reviewing

Paper

Accepted on 18 Feb 2026 by Justine Serrano

Tau2025_Polat.pdf