Proton Electromagnetic Time-Like form Factors Updated at Threshold

Key Points

• The aim is to provide a revised expression for the proton's electromagnetic form factor in the time-like region near threshold.
• Utilized recent data on p antip annihilation cross section.
• Incorporated branching ratios of p`p into e+e--pairs from atomic states.
• Extracted form factor value at threshold (s=q2=4m2p).
• The electromagnetic form factor at threshold is quantified as |Gp(4m2p)|=0.41+0.02-0.08.
• Results show improved accuracy for the form factor measurement near the threshold.