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MEASUREMENT OF THE RATE OF THE DECAY KL-]E+E-GAMMA AND OBSERVATION OF A FORM-FACTOR IN THIS DECAY

Abstract:
A large sample of Dalitz decays, KL→e+e-γ, has been observed. The branching ratio is Γ(KL→e+e-γ)/Γ(K L→ all) = (9.2±0.5±0.5) × 10-6 in good agreement with theoretical predictions. We observe an enhancement at high masses in the distribution of the invariant electron-positron pair mass, compared to the distribution expected from QED. This excess is interpreted as being due to virtual vector mesons contributing to the photon propagator.
Publication status:
Published

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Journal:
PHYSICS LETTERS B
Volume:
240
Issue:
1-2
Pages:
283-288
Publication date:
1990-04-19
DOI:
ISSN:
0370-2693
URN:
uuid:b8bf3937-3c00-4559-b0e7-45b80e8c0f06
Source identifiers:
15616
Local pid:
pubs:15616
Language:
English

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