Search for the decay K_L-> pi^0 nu nubar

Abstract

We report on a search for the rare decay K_L -> pi^0 nu nubar in the KTeV experiment at Fermilab. We searched for two-photon events whose kinematics were consistent with an isolated pi^0 coming from the decay K_L -> pi^0 nu nubar. One candidate event was observed, which was consistent with the expected level of background. An upper limit on the branching ratio was determined to be B(K_L -> pi^0 nu nubar) < 1.6E-6 at the 90% confidence level.

arXiv commentDocumentstyle aps,psfig,prl, 5 pages, 3 figures

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• $K_L\to {\pi }^0\nu \bar{\nu }$ Beyond the Standard Model
• $K\to \pi \nu \bar{\nu }$ and High Precision Determinations of the CKM Matrix
• Precise Determinations of the CKM Matrix from CP-Asymmetries in B-Decays and K_L --> π^0 ν\barν

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• The s ---> d gamma decay in and beyond the Standard Model
• Constraints on the Mass and Mixing of the 4th Generation Quark From Direct CP Violation${\epsilon }^{\prime }/\epsilon$ and Rare K Decays
• Rare decays: theory vs. experiments
• Kaon decays and the flavour problem
• Plans for Kaon Physics at BNL