Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting
the full scientific potential of the CERN's accelerator complex and scientific infrastructures …

This article reviews the current situation in the field of rare K decays: the relevant
phenomenology, the present experimental situation, and prospects for the near future. Study …

An event consistent with the signature expected for the rare kaon decay K+→ π+ ν ν has
been observed. In the pion momentum region examined, 211< P< 230 MeV/c, the …

Additional evidence for the rare kaon decay K+→ π+ ν ν has been found in a new data set
with comparable sensitivity to the previously reported result. One new event was observed in …

An additional event near the upper kinematic limit for K+→ π+ ν ν¯ has been observed by
experiment E949 at Brookhaven National Laboratory. Combining previously reported and …

A timely and long-term programme of kaon decay measurements at a new level of precision
is presented, leveraging the capabilities of the CERN Super Proton Synchrotron (SPS). The …

A timely and long-term programme of kaon decay measurements at an unprecedented level
of precision is presented, leveraging the capabilities of the CERN Super Proton Synchrotron …

Experiment E949 at Brookhaven National Laboratory studied the rare decay<? format?>
K+→ π+ ν ν¯ and other processes with an exposure of 1.77× 10 12<? format?> K+'s. The …

We report the results of a search for the decay K+→ π+ ν ν in the kinematic region with π+
momentum 140< P< 195 MeV/c using the data collected by the E787 experiment at BNL. No …

A search for additional evidence for the rare kaon decay K+→ π+ ν ν has been made with a
new data set comparable in sensitivity to the previous exposure that produced a single …