https://doi.org/10.1051/epjconf/20159601009
Measurement of the hadronic cross section at KLOE/KLOE-2
INFN Sezione Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
a e-mail: veronica.deleo@roma3.infn.it
Published online: 2 June 2015
The measurement of the hadronic cross section σ(e+ e− → π+ π−) is particularly important to test the Standard Model calculation for the (g − 2) of the muon, where a long standing 3σ discrepancy is observed. Different measurements of this quantity have been performed at DAΦNE, the Frascati ϕ factory, with the KLOE detector. In 2005, 2008, 2013 the KLOE/KLOE-2 Collaborations published three measurements of the σ(e+ e− → π+ π−) cross section with the photon emitted at small angle, and an independent measurement of the σ(e+ e− → π+ π−) cross section with the photon emitted at large angle using data at a collision energy of 1 GeV (i.e. 20 MeV below the ϕ -peak) was published in 2010. In the following the preliminary combination of the last three KLOE results (KLOE08, KLOE10, KLOE12), together with the preliminary fit to the pion form factor, will be presented.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
