We have measured the cross section σ(e+e− →π+π−γ ) at an energy W = mφ = 1.02 GeV with the KLOE detector at the electron–positron collider DAFNE. From the dependence of the cross section on the invariant mass of the two-pion system, we extract σ(e+e− →π+π−) for the mass range 0.35 < s <0.95 GeV^2. From this result, we calculate the pion form factor and the hadronic contribution to the muon anomaly, aμ.
MEASUREMENT OF SIGMA(E+E- --> PI+ PI- GAMMA) AND EXTRACTION OF SIGMA(E+E- --> PI+ PI-) BELOW 1-GEV WITH THE KLOE DETECTOR.
GORINI, Edoardo;PRIMAVERA, Margherita;VENTURA, Andrea;
2005-01-01
Abstract
We have measured the cross section σ(e+e− →π+π−γ ) at an energy W = mφ = 1.02 GeV with the KLOE detector at the electron–positron collider DAFNE. From the dependence of the cross section on the invariant mass of the two-pion system, we extract σ(e+e− →π+π−) for the mass range 0.35 < s <0.95 GeV^2. From this result, we calculate the pion form factor and the hadronic contribution to the muon anomaly, aμ.File in questo prodotto:
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