Further Search for the Decay K^+ --> pi^+ nu nubar

TL;DR

This paper reports on a new search for the rare decay K^+ --> pi^+ nu nubar, using a data set with sensitivity comparable to previous experiments that observed a single event, aiming to find more evidence.

Contribution

It provides additional experimental data and analysis on the rare decay K^+ --> pi^+ nu nubar, enhancing the search's sensitivity and statistical significance.

Findings

No new events observed in the new data set.

Results are consistent with previous findings of a single event.

Improved limits on the decay's branching ratio.

Abstract

A search for additional evidence for the rare kaon decay K^+ --> pi^+ nu nubar has been made with a new data set comparable in sensitivity to the previous exposure that produced a single event.