0000000000024613

AUTHOR

K. Holtz

showing 5 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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A new measurement of the branching ratio of K(S) → γ γ

2000

Abstract The decay rate of KS → γγ has been measured with the NA48 detector at the CERN SPS. A total of 149 KS → γγ events have been observed. The branching ratio is determined to be (2.58±0.36(stat)±0.22(sys))×10−6.

Nuclear physicsPhysicsNuclear and High Energy Physicsmesoni K; decadimentiLarge Hadron ColliderBranching fractionDetector
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Observation of the decay KS→π+π−e+e−

2000

Abstract We present the first observation of the decay KS→π+π−e+e− based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL→π+π−π0D decays as normalization sample, the branching ratio is measured to be BR(KS→π+π−e+e−)=[4.5±0.7(stat)±0.4(syst)]×10−5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.

mesoni K; decadimenti rarimesoni KPhysicsNuclear physicsNuclear and High Energy Physicsdecadimenti rariBranching fractionBremsstrahlungNA48 experimentPhysics Letters B
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Measurement of the quadratic slope parameter in the K-L -> 3 pi(0) decay Dalitz plot

2001

A value of (-6.1 +- 0.9_{stat} +- 0.5_{syst})*10^{-3} is obtained for the quadratic slope parameter h in the K_L -> 3\pi^0 decay Dalitz plot at the NA48 experiment at the CERN SPS. The result is based on 14.7*10^6 fully reconstructed K_L -> 3\pi^0 -> 6\gamma decays. This is the most precise measurement of any of the Dalitz plot slope parameters in the charged and neutral kaon decays so far.

Physicsneutral kaonParticle physicsNuclear and High Energy PhysicsLarge Hadron Collidermesoni K; decadimenti; Dalitz plotdecadimentiDalitz plotkaon decay; neutral kaon; dalitz plotslope parametersNA48 experimentDalitz plotValue (computer science)KaonsKaons; Dalitz plot; slope parameterskaon decayHigh Energy Physics - Experimentmesoni KClassical mechanicsQuadratic equationK->3-PI
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Search for the decay KS → π0γγ

2003

Abstract A search for the decay K S → π 0 γγ has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity K S beam, an upper limit for the branching ratio BR ( K S → π 0 γγ , z ⩾0.2) −7 has been obtained at 90% confidence level, where z = m γγ 2 / m K 0 2 .

Nuclear physicsPhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron Collider010308 nuclear & particles physicsBranching fraction0103 physical sciencesDetectorLimit (mathematics)010306 general physics01 natural sciencesBeam (structure)
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