0000000000024618

AUTHOR

I. Mestvirishvili

showing 2 related works from this author

First observation of the KS → π0γ γ decay

2004

Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory predictions. © 2003 Elsevier B.V. All rights reserved.

PhysicsNuclear and High Energy PhysicsParticle physicsChiral perturbation theoryLarge Hadron Colliderdecadimenti010308 nuclear & particles physicsBranching fractionDetector01 natural sciencesmesoni KNuclear physicsmesoni K; decadimenti0103 physical sciences010306 general physicsPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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Search for CP violation in K0→3π0 decays

2005

Abstract Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K S → 3 π 0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K 0 / K ¯ 0 → 3 π 0 decays, the CP violating amplitude η 000 = A ( K S → 3 π 0 ) / A ( K L → 3 π 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 → 3 π 0 ) 7.4 × 10 −7 at 90% confidence level. The result is used to improve knowledge of Re ( e ) and the CPT violating quantity Im ( δ ) via the Bell–Steinberger relation.

Nuclear physicsPhysicsNuclear and High Energy PhysicsParticle physicsAmplitude010308 nuclear & particles physicsBranching fraction0103 physical sciencesPiCP violation010306 general physicsLifetime distribution01 natural sciencesPhysics Letters B
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