Comment for article "Limits on a nucleon-nucleon monopole-dipole (axionlike) P,T-noninvariant interaction from spin relaxation of polarized 3He" Yu. N. Pokotilovski arXiv:0902.1682v2 [nucl-ex] 12 Feb 2009

TL;DR

This comment critiques a previous claim of new constraints on axionlike P,T-noninvariant interactions, showing the actual limits are significantly weaker and not new, based on the same experimental data.

Contribution

It clarifies that the previously claimed constraints are not new and are much weaker than existing limits, correcting the scientific record.

Findings

Original constraints were overestimated by a factor of about 100.

The actual constraints are comparable to limits from UCN depolarization.

The data do not establish new bounds on nucleon-nucleon monopole-dipole interactions.

Abstract

In article "Limits on a nucleon-nucleon monopole-dipole (axionlike) P,T-noninvariant interaction from spin relaxation of polarized 3He" Yu. N. Pokotilovski arXiv:0902.1682v2 [nucl-ex] 12 Feb 2009 it was presented new constraints for the product of the scalar, pseudo-scalar dimensionless constants: gs*gp < 1*10^-17 for the parameter lam about 10^-4 cm, determining the range of forces. In this comment it is shown that the real constraint for the same parameter lam from the same experimental data is about 2*10^-11. It is worse in about one hundred times that the constraint from UCN depolarization and can not be considered as a new limit on a nucleon-nucleon monopole-dipole (axionlike) P,T-noninvariant interaction.