Comment on "Material Evidence of a 38 MeV Boson"

TL;DR

This paper critically examines a recent claim of a 38 MeV boson based on COMPASS data, arguing that the observed structures are due to secondary interactions and do not confirm the particle's existence.

Contribution

It provides a critical analysis showing that the structures claimed as evidence are actually artifacts, refuting the previous claim of a 38 MeV boson.

Findings

Structures are due to secondary interactions, not a new boson.

COMPASS data do not confirm the 38 MeV state.

Observed features are consistent with known background effects.

Abstract

In the recent preprint 1202.1739 it was claimed that preliminary data presented by COMPASS at recent conferences confirm the existence of a resonant state of mass 38 MeV decaying to two photons. This claim was made based on structures observed in two-photon mass distributions which however were shown only to demonstrate the purity and mass resolution of the {\pi}0 and {\eta} signals. The additional structures are understood as remnants of secondary interactions inside the COMPASS spectrometer. Therefore, the COMPASS data do not confirm the existence of this state.