First observation and branching fraction and decay parameter measurements of the weak radiative decay Xi0 --> Lambda e+e-

NA48 collaboration

First observation and branching fraction and decay parameter measurements of the weak radiative decay Xi0 --> Lambda e+e-

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/0703023 v2 pith:2TOVEC3X submitted 2007-03-13 hep-ex

NA48 Collaboration This is my paper · ORCID

classification hep-ex

keywords lambdadecaybeenbranchingconsistentfirstfractionparameter

verification ladder T0 review T1 audit T2 compute T3 formal

0 comments

read the original abstract

The weak radiative decay Xi0 --> Lambda e+e- has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 +/- 5 events. We determine the branching fraction B(Xi0 --> Lambda e+e-) = [7.6 +/- 0.4(stat) +/- 0.4(syst) +/- 0.2(norm)] x 10^{-6}, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter alpha_{XiLambdaee} = -0.8 +/- 0.2, consistent with that of Xi0 --> Lambda gamma. The charge conjugate reaction Xi0_bar --> Lambda_bar e+e- has also been observed.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 1 Pith paper

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

CP violation studies at Super Tau-Charm Facility
hep-ex 2025-02 conditional novelty 4.0 of 10

A future Super Tau-Charm Facility is projected to test CP violation in hyperon, tau, and charm decays at 1e-4 to 1e-3 sensitivities and improve the kaon CPT mass-difference limit tenfold.

Pith tools