Comment on "An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN"

TL;DR

This paper critiques the statistical analysis of KATRIN's neutrino mass measurement, questioning why negative mass squared values are excluded despite their physical plausibility.

Contribution

It highlights a potential oversight in the KATRIN analysis methodology regarding negative mass squared values.

Findings

Negative mass squared values occur in KATRIN data.

Exclusion of negative values may bias the results.

Questioning standard analysis practices in neutrino mass experiments.

Abstract

We note that the central value of the KATRIN measurement has negative mass squared, and wonder why the statistical analysis excludes such values a priori.