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23. August 2021

COMPASS points to triangle singularity COMPASS points to triangle singularity

Article in the CERN courier about the Triangle Singularity as the origin of the a1(1420) paper.

COMPASS points to triangle singularity
COMPASS points to triangle singularity © CERN Courier
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Article in the CERN courier:

The COMPASS experiment at CERN has reported the first direct evidence for a long-hypothesised interplay between hadron decays which can masquerade as a resonance. The analysis, which was published last week in Physical Review Letters, suggests that the “a1(1420)” signal observed by the collaboration in 2015 is not a new exotic hadron after all, but the first sighting of a so-called triangle singularity.