Abstract
The process [Formula: see text] has been studied in the [Formula: see text] mass range from threshold to 6.5 GeV/c2 using the initial-state-radiation technique with both detected and undetected photon. The analysis is based on 469 fb-1 of integrated luminosity collected with the BABAR detector at the PEP-II collider at e+e- center-of-mass energies near 10.6 GeV.
Highlights
The energy dependence of the e+e− → ppcross section is given by σpp(Mpp)
The growth of the form factor near threshold as well as the deviation of the ratio |GE /GM | from unity may be due to final-state interaction between the proton and antiproton.[7]
To compensate the main mass dependence of the form factor (1/m4) we show the scaled form factor
Summary
√ 1 − τ, C is the Coulomb correction factor.[1] The cross section depends on two form factors, electric GE and magnetic GM. From measurement of the cross section we determine the effective form factor. The ratio of the form factors can. This is an Open Access article published by World Scientific Publishing Company. In PS170 experiment[2] at LEAR the proton form factor was measured near threshold. Very precise measurement of the form factor was performed on about 1.4 fb−1 data collected by CLEO at 3.77 and 4.17 GeV.[3]
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