What does this research mean for the field?

The neutron electromagnetic form factor has been measured for the first time in the time-like region at q^2 = 4.0 and 4.4 (GeV/c)^2. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.ESTABLISHES_NEW_DIRECTION.

What question did this study set out to answer?

This research aimed to measure the neutron electromagnetic form factor in the time-like region.

March 5, 2026Open Access

First Measurement of the Neutron Electromagnetic Form Factor in the Time-Like Region

Key Points

This research aimed to measure the neutron electromagnetic form factor in the time-like region.
Conducted by the FENICE experiment at the ADONE e^+e^- storage ring.
Measured form factors at specific momentum transfer values (q^2 = 4.0 and 4.4 (GeV/c)^2).
Included a new measurement of the proton form factor for comparison.
Provided the first measurements of the neutron form factor in the time-like region.
Presented results at momentum transfers of q^2 = 4.0 and 4.4 (GeV/c)^2.

Abstract

The first measurements of the neutron form factor in the time-like region has been performed by the FENICE experiment at the ADONE e^+e^- storage ring. Results at q² = 4. 0 and 4. 4 (GeV/c) ², together with a new measurement of the proton form factor are presented here.

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