The beam and detector, used for the NA48 experiment, devoted to the measurement of Re(epsilon'/epsilon) and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described
The decay rate of K L → π 0 γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 K L → π 0 γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 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 K L → π 0 e + e − decay. An upper limit for the K L → π 0 γγ decay rate in the two photon mass region m γγ < m π 0 is also given.
Motivation 2 The Role of the MINOS 3 Possible Evolution of Neutrino Physics 4 Off-Axis NuMI Neutrino Beam 4.1 NuMI Off-Axis Neutrino Fluxes 4.2 4.3 Antineutrino Beams 4.4 Proton Economics 5 v/1 5.1 5.2 Possible 5.3 Background measurements and estimates; 5.4 Physics Potential of the NuMI Off-axis Beam 5.5 with JHF Phase I . . . . Future Evolution of the Off-Axis Neutrino '-'~.~~•.~
Abstract.The semileptonic decay of the neutral K meson, K 0 L → π ± e ∓ ν (K e3 ), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f + (q 2 )), scalar (f S ) and tensor (f T ) interactions were measured. The linear slope of the vector form factor λ + = 0.0284 ± 0.0007 ± 0.0013 and values for the ratios |f S /f + (0)| = 0.015
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.