Measurement of the Pion Form Factor with CMD-3 Detector and its Implication to the Hadronic Contribution to Muon ( g−2 )

This is the authors' abstract. We don't add key points for this paper.

The cross section of the process <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>e</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>e</a:mi><a:mo>−</a:mo></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mi>π</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mo>−</a:mo></a:msup></a:math> has been measured in the center-of-mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on an integrated luminosity of about <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mn>88</d:mn><d:mtext> </d:mtext><d:mtext> </d:mtext><d:msup><d:mi>pb</d:mi><d:mrow><d:mo>−</d:mo><d:mn>1</d:mn></d:mrow></d:msup></d:math>, of which <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mn>62</f:mn><f:mtext> </f:mtext><f:mtext> </f:mtext><f:msup><f:mi>pb</f:mi><f:mrow><f:mo>−</f:mo><f:mn>1</f:mn></f:mrow></f:msup></f:math> represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:mi>ρ</h:mi></h:math> resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed.