The trigger for K0→π0π0 decays of the NA48 experiment at CERN

Barr, G.; Cundy, D.; Formenti, F.; Gorini, B.; Hallgren, B.; Iwański, W.; Kapusta, P.; Laverriere, G.; Lenti, M.; Mikulec, I.; Velasco, M.; Vossnack, O.; Wahl, H.; Ziółkowski, M.; Porcu, M.; Rossi, Fabiana; Avanzini, C.; Calafiura, P.; Cirilli, M.; Costantini, F.; Laico, F.; Magazzù, G.; Morsani, F.; Pierazzini, G.; Rizzi, D.; Sozzi, M.; Tripiccione, R.; Dibon, H.; Fischer, G.; Jeitler, M.; Markytan, M.; Neuhofer, G.; Pernicka, M.; Taurok, A.; Widhalm, L.

doi:10.1016/s0168-9002(01)02148-9

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Cited by 11 publications

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“…The trigger decision for 3π 0 events was based on projections of the deposited energy in the liquid krypton calorimeter [9]. In both run periods the trigger required a total deposited energy of at least 50 GeV.…”

Section: Methodsmentioning

confidence: 99%

Search for CP violation in K0→3π0 decays

Lai

Marras

Batley³

et al. 2005

Physics Letters B

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Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K S → 3π 0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K 0 /K 0 → 3π 0 decays, the CP violating amplitude η 000 = A(K S → 3π 0 )/A(K L → 3π 0 ) has been found to be Re(η 000 ) = −0.002 ± 0.011 ± 0.015 and Im(η 000 ) = −0.003 ± 0.013 ± 0.017. This corresponds to an upper limit on the branching fraction of Br(K S → 3π 0 ) < 7.4 × 10 −7 at 90% confidence level. The result is used to improve knowledge of Re(ǫ) and the CPT violating quantity Im(δ) via the Bell-Steinberger relation.

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Section: Methodsmentioning

confidence: 99%