The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected performance of the detector and associated systems, as established by test beam measurements and simulation studies, is described.
The Dalitz plot slope parameters g, h and k for the K − → π 0 π 0 π − decay have been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV negative secondary beam of the U-70 PS. About 252 K events with four-momenta measured for the π − and four involved photons were used for the analysis. The values obtained g = 0.627 ± 0.004(stat) ± 0.010(syst), h = 0.046 ± 0.004(stat) ± 0.012(syst), k = 0.001 ± 0.001(stat) ± 0.002(syst) are consistent with the world averages dominated by K + data, but have significantly smaller errors.
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