0000000000132265

AUTHOR

F. Perfetto

showing 2 related works from this author

Measurement of the branching ratio and search for a CP violating asymmetry in the η→π+π−e+e−(γ) decay at KLOE

2009

Abstract We have studied the η → π + π − e + e − ( γ ) decay using about 1.7 fb − 1 collected by the KLOE experiment at the DAΦNE ϕ -factory. This corresponds to about 72 millions η mesons produced in ϕ radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR ( η → π + π − e + e − ( γ ) ) = ( 26.8 ± 0.9 Stat . ± 0.7 Syst . ) × 10 − 5 . We have obtained the first measurement of the CP-odd ππ – ee decay planes angular asymmetry, A ϕ = ( − 0.6 ± 2.5 Stat . ± 1.8 Syst . ) × 10 − 2 .

PhysicsNuclear and High Energy PhysicsParticle physicsMesonBranching fractionmedia_common.quotation_subjectGamma rayPiRadiative transferCP violationAsymmetrymedia_commonPhysics Letters B
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Measurement of the η→3π0 slope parameter α with the KLOE detector

2010

Abstract We present a measurement of the slope parameter α for the η → 3 π 0 decay, with the KLOE experiment at the DAΦNE ϕ -factory, based on a background free sample of ∼17 million η mesons produced in ϕ radiative decays. By fitting the event density in the Dalitz plot we determine α = − 0.0301 ± 0.0035 stat − 0.0035 + 0.0022 syst . The result is in agreement with recent measurements from hadro- and photo-production experiments.

PhysicsNuclear physicsNuclear and High Energy PhysicsParticle physicsMesonElectron–positron annihilationDetectorPiRadiative transferDalitz plotPhysics Letters B
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