LHCb's latest rare-decay papers are a reminder that science often advances by saying what did not happen. The paper's May 11 brief on the 4-sigma LHCb thread held the line against discovery inflation. Tuesday's brief keeps it there.

One LHCb collaboration paper searches for the decays B0 and Bs0 to J/psi gamma, a narrow channel whose absence can still constrain models. The arXiv record identifies it as a search, not an observation. [1]

A second Moriond proceedings paper surveys rare and very rare decays of third-generation particles, including b-hadrons and tau leptons. Its abstract says these decays probe physics beyond the Standard Model at energy scales beyond direct searches, then names recent searches, first searches, and stringent limits. It does not claim a new particle or a broken theory. [2]

The restraint is not small news. Rare-decay physics often advances by shrinking allowed space for new physics, one confidence limit at a time. A non-discovery can still make future claims harder, cleaner and more expensive. That is a public result even when the headline lacks fireworks.

That is the divergence. X likes the romance of anomalies. MSM likes the institutional modesty of proceedings. The paper's job is simpler: record technical tightening as news because the limit is the product.

-- KENJI NAKAMURA, Tokyo