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Precise measurement of the decay KL→π0γγ
2002
Physics Letters B
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The decay rate of has been measured with the NA48 detector at the CERN SPS. A total of 2558 candidates have been observed with a residual background of 3.2 ±0.03_(stat)±0.03_(syst)± 0.03_(norm))×10^-6 and the vector coupling constant a_v = -0.46 ±0.03_(stat)±0.04_(syst). This result suggests that the CP-violation effects are dominating in the decay. An upper limit for the decay rate in the two photon mass region m_γγ<m_π^0 is also given.
doi:10.1016/s0370-2693(02)01863-4
fatcat:w6wv7wheajf6zhbqnj5rv7rd6y