Precise measurements of the KS->gamma gamma and KL->gamma gamma decay rates

Abstract

The KS->gamma gamma decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(KS->gamma gamma)=(2.78+-0.06(stat)+-0.04(syst))x10-6, obtained from 7461+-172 KS->gamma gamma events, is significantly higher than the O(p^4) prediction of Chiral Perturbation Theory. Using a KL beam the ratio BR(KL->gamma gamma)/BR(KL->3pi0)=(2.81+-0.01(stat)+-0.02(syst))x10-3 has been measured.

10 pages, 5 figures; submitted to Phys Lett. B

References in corpus (3)

• A precise measurement of the direct CP violation parameter Re(epsilon'/epsilon)
• K_S\rightarrow γγ, K_L\rightarrowπ^0γγ$ and Unitarity
• New measurements of the $\eta$ and $K^0$ masses

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