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Study of CP Violation and Rare Decays in NA48 at CERN Using 400-450 GeV Protons

This paper presents findings from the NA48 experiment at CERN's Kaon facility, focusing on CP violation and rare decays involving KL mesons. We report a charge asymmetry for the decay KL → π+π−e+e− measured at (14.2 ± 3.0 stat ± 1.9 sys)%. Additionally, rare decay branching ratios such as BR(KL → e+e−γ), BR(KL → e+e−e+e−), as well as the influence of intermediate meson contributions are analyzed, using extensive datasets from 1997 to 2001, including over 600,000 events.

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Study of CP Violation and Rare Decays in NA48 at CERN Using 400-450 GeV Protons

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  1. Fixed target experiment with 400-450 GeV protons from SPS NA48the CERN Kaon facility

  2. NA48: CP violation Ke3 Charge Asymmetry KL→p+p-e+e- decay AfL = (14.2 ± 3.0stat ± 1.9sys)%

  3. NA48: rare decays 1997 data (7000 events): BR(KL→e+e-g) = (1.06±0.02stat±0.02syst±0.04norm)×10-5 Meeg KL→e+e-g BR(KL→e+e-e+e-) = (3.30±0.24stat±0.14syst±0.10norm)×10-8 X= Mee2 / MK2 KL→e+e-e+e- In the BMS model: aK* measure the relative strenght of intermediate pseudoscalar and vector meson contribution 1998-1999-2001 (600000 events) aK* = -0.207 ± 0.019 ± 0.017 BR(KL→gg) / BR(KL→3p0) = (2.81±0.01stat±0.02syst)×10-3 BR(KL→p0gg) = (1.36 ±0.03stat±0.03syst±0.03norm) x 10-6

  4. NA48: Vus

  5. NA48/1 6 events found in the signal region with a background of 0.22+0.19-0.12

  6. NA48/2: cusp effect

  7. NA48/2: “Neutral Asymmetry”

  8. NA48/2: “Charged Asymmetry”

  9. NA48/2: Vus Vus x f+(0)

  10. NA48/2: Ke2/Km2

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