出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a measurement of the branching ratio for the decay KS!gg and a direct search for the
decay KS!e+e− made with the KLOE detector. The analyses use a sample of e+e−!f !KSKL
events produced at DAFNE, the Frascati f -factory. Using an integrated luminosity of 1.6 fb−1
we measure BR(KS !gg ) = (2.27±0.13+0.03
−0.04)×10−6 in agreement with O(p4) prediction of
cPT. No KS !e+e− events were found exceeding the expected background in a sample of 1.3
fb−1 and we derive the upper limit BR(KS !e+e−) < 2.1×10−8 at 90% CL.
