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Observation of the decay K-S -> pi(+)pi(-)e(+)e(-)

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-πD/0 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. © 2000 Elsevier Science B.V.
Publication status:
Published

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Journal:
Physics Letters B
Volume:
496
Issue:
3-4
Pages:
137-144
Publication date:
2000-12-28
DOI:
ISSN:
0370-2693
Source identifiers:
12881
Language:
English
Pubs id:
pubs:12881
UUID:
uuid:1e7c8278-8b47-4f10-9caf-f1b72d82af04
Local pid:
pubs:12881
Deposit date:
2012-12-19

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