0000000000676788

AUTHOR

A.j. Culling

showing 2 related works from this author

First observation and measurement of the decay K±→π±e+e−γ

2008

Abstract Using the full data set of the NA48/2 experiment, the decay K ± → π ± e + e − γ is observed for the first time, selecting 120 candidates with 7.3 ± 1.7 estimated background events. With K ± → π ± π D 0 as normalisation channel, the branching ratio is determined in a model-independent way to be Br ( K ± → π ± e + e − γ , m e e γ > 260  MeV / c 2 ) = ( 1.19 ± 0.12 stat ± 0.04 syst ) × 10 −8 . This measured value and the spectrum of the e + e − γ invariant mass allow a comparison with predictions of chiral perturbation theory.

PhysicsNuclear and High Energy PhysicsAntiparticleChiral perturbation theoryMeson010308 nuclear & particles physicsBranching fractionHadronAnalytical chemistry01 natural sciencesNuclear physicsParticle decayPion0103 physical sciences010306 general physicsDimensionless quantityPhysics Letters B
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Search for direct CP-violation in K±→π±π0π0 decays

2006

Abstract A search for direct CP-violation in K ± → π ± π 0 π 0 decay based on 47.14 million events has been performed by the NA48/2 experiment at the CERN SPS. The asymmetry in the Dalitz plot linear slopes A g = ( g + − g − ) / ( g + + g − ) is measured to be A g = ( 1.8 ± 2.6 ) × 10 −4 . The design of the experiment and the method of analysis provide good control of instrumental charge asymmetries in this measurement. The precision of the result is limited by statistics and is almost one order of magnitude better than that of previous measurements by other experiments.

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron Collidermedia_common.quotation_subjectPiCP violationDalitz plotCharge (physics)Good controlAsymmetryOrder of magnitudemedia_commonPhysics Letters B
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