Pith. sign in

REVIEW 2 cited by

Measurement of the Ratio Gamma(KL -> pi+ pi-)/Gamma(KL -> pi e nu) and Extraction of the CP Violation Parameter |eta+-|

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv hep-ex/0611052 v1 pith:KLHYS225 submitted 2006-11-28 hep-ex

NA48 Collaboration This is my paper
classification hep-ex
keywords gammak2piratiodecaymeasurementparameterviolationanalysis
verification ladder T0 review T1 audit T2 compute T3 formal
0 comments
read the original abstract

We present a measurement of the ratio of the decay rates Gamma(KL -> pi+ pi-)/Gamma(KL -> pi e nu), denoted as Gamma(K2pi)/Gamma(Ke3). The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47000 K2pi and five million Ke3 decays, we find Gamma(K2pi)/Gamma(Ke3) = (4.835 +- 0.022(stat) +- 0.016(syst)) x 10^-3. From this we derive the branching ratio of the CP violating decay KL -> pi+ pi- and the CP violation parameter |eta+-|. Excluding the CP conserving direct photon emission component KL -> pi+ pi- gamma, we obtain the results BR(KL -> pi+ pi-) = (1.941 +- 0.019) x 10^-3 and |eta+-| = (2.223 +- 0.012) x 10^-3.

Discussion (0). Sign in to comment.

Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Nelson-Barr ultralight dark matter

    hep-ph 2024-05 unverdicted novelty 6.0 of 10

    Nelson-Barr mechanism yields ultralight scalar dark matter inducing time-periodic variation in CKM matrix elements, distinguishable from QCD axion and detectable via nuclear clocks.

  2. Constraint on ultralight Nelson-Barr dark matter from time-dependent nuclear decay

    hep-ph 2025-06 conditional novelty 4.0 of 10

    Non-observation of periodic modulation in tritium beta decay sets a new 95% CL exclusion on ultralight Nelson-Barr scalar dark matter: f below 7.0e9 to 1.4e7 GeV is ruled out for m_phi in 3.4e-23 to 1.7e-20 eV.

Pith tools