Latest Results from NA48 and NA48/1
Mark Slater (for the NA48 collaboration)
TL;DR
The NA48/1 collaboration observed rare KS decays into pi0e+e- and pi0mu+mu-, measuring their branching ratios and providing insights into CP violation, based on high-intensity data from CERN SPS in 2002.
Contribution
First measurements of KS->pi0e+e- and KS->pi0mu+mu- decays, constraining CP violation parameters and expanding understanding of rare kaon decay modes.
Findings
Measured BR(KS->pi0e+e-) = (5.8 +2.9 -2.4) x 10^-9
Measured BR(KS->pi0mu+mu-) = (2.9 +1.5 -1.2) x 10^-9
Observed signals provide new constraints on CP violation
Abstract
The first observations of the rare decays KS->pi0e+e- and KS->pi0mu+mu- have been made by the NA48/1 collaboration at the CERN SPS accelerator. From high intensity KS data collected during the 2002 run, clean signals of 7 KS->pi0e+e- events and 6 KS->pi0mu+mu- events were observed, giving branching ratio measurements of BR(KS->pi0e+e-) = 5.8 +2.9 -2.4 x 10^-9 and BR(KS->pi0mu+mu-) = 2.9 +1.5 -1.2 x 10^-9. These results constrain the indirect CP violating component of the corresponding KL decays. Other recent results from NA48 are also presented.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Computational Physics and Python Applications