Critique shows that assumptions including photon emission threshold and Fermi's Golden Rule application in Rathmann et al. create spurious depolarization effects; consistent QM treatment finds them negligible at the EIC.
Beam-Induced Nuclear Depolarisation in a Gaseous Polarised Hydrogen Target
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abstract
Spin-polarised atomic hydrogen is used as a gaseous polarised proton target in high energy and nuclear physics experiments operating with internal beams in storage rings. When such beams are intense and bunched, this type of target can be depolarised by a resonant interaction with the transient magnetic field generated by the beam bunches. This effect has been studied with the HERA positron beam in the HERMES experiment at DESY. Resonances have been observed and a simple analytic model has been used to explain their shape and position. Operating conditions for the experiment have been found where there is no significant target depolarisation due to this effect.
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2026 1verdicts
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Comments on the paper "Eliminating beam-induced depolarizing effects in the hydrogen jet target for high-precision proton beam polarimetry at the Electron-Ion Collider"
Critique shows that assumptions including photon emission threshold and Fermi's Golden Rule application in Rathmann et al. create spurious depolarization effects; consistent QM treatment finds them negligible at the EIC.