New Measurement of the K⁺ → π⁺νν̅ Branching Ratio by the CERN NA62 Experiment

by Matthew Szydagis (The University at Albany, SUNY)

Tuesday 18 Feb 2025, 15:30 → 17:30 US/Eastern

The K⁺ → π⁺νν̅ decay is a highly suppressed flavor-changing neutral current dominated by short distance dynamics. With only about 3% theoretical uncertainty on the Standard Model branching ratio, and given its properties, this process is often called a "golden mode" for New Physics searches.

Almost 30 years ago, the BNL AGS E797 experiment reported the first evidence of this decay. Recently, the CERN SPS NA62 experiment achieved a signal significance above five sigmas.

In this talk, I will introduce flavor physics, present the NA62 experiment, and review the 2016–2018 and 2021–2022 NA62 K⁺ → π⁺νν̅ searches.

Zoom:https://bnl.zoomgov.com/j/1617489674?pwd=aTmhSZ1ncKD7wWlqQ2iHfoTniiAlOX.1

Meeting ID: 161 748 9674

Passcode: 

893268