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Observation of K0(S) semileptonic decays with CMD-2 detector

Collaboration
•
May, 1999
7 pages
Published in:
  • Phys.Lett.B 456 (1999) 90-94
e-Print:
DOI:
Experiments:
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Abstract: (Elsevier)
The decay K S 0 → πeν has been observed by the CMD-2 detector at the e + e − collider VEPP-2M at Novosibirsk. Of 6 million produced K L 0 K S 0 pairs, 75±13 events of the K S 0 → πeν decay were selected. The corresponding branching ratio is B( K S 0 → πeν )=(7.2±1.4)×10 −4 . This result is consistent with the evaluation of B( K S 0 → πeν ) from the K L 0 semileptonic rate and K S 0 lifetime assuming ΔS = ΔQ .
Note:
  • 7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.B
  • electron positron: colliding beams
  • electron positron: annihilation
  • Phi(1020): electroproduction
  • K0: pair production
  • K0(S): semileptonic decay
  • K0(S): branching ratio
  • magnetic detector: experimental results
  • Novosibirsk Stor2
  • electron positron --> Phi(1020)
  • Phi(1020) --> K0(L) K0(S)