Speaker
Jia Xu
(University of Michigan)
Description
We are going to report on the performance of the K0TO experiment at J-PARC during the 2013 physics run. The goal of K0TO is to discover and measure the rate of the rare decay KL into pi0 nu nubar .
This flavor changing neutral current decay violates CP directly and proceeds through second-order weak interactions.
The Standard Model predicts the branching ratio to be (2.8+/-0.4)x10^(-11).
The experiment is designed to reach sensitivity for discovery of this rare decay with 2x10^(14) protons on target (POT) per spill in 3 Snowmass years (3x10^(7)s).
It is a follow-up to E391 at KEK with a completely redesigned beamline, a new CsI calorimeter with increased granularity and reduced shower leakage, and a new readout electronics, trigger and data acquisition system.
K0TO first physics run, scheduled for May-June 2013, expects to accumulate about 10^(19) protons on target（POT） and reach the Grossman-Nir limit sensitivity of 1.46x10^(-19) at 90% CL. However, due to one radiation accident occurred on May 23th, the data taking is stopped, and the integrated POT is 8*10^(18).
| APS member ID | 61091217 |
|---|
Primary author
Jia Xu
(University of Michigan)
