Measurement of the rate of the decay KL→e+e−γ and observation of a form factor in this decay

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Measurement of the rate of the decay KL→e+e−γ and observation of a form factor in this decay

H. D. Wahl P. Calafiura R. Heinz Ken Peach R. Hagelberg H.g. Sander I. Harrus V. Gibson R.l. Chase H. Blümer R. Fantechi Daniel Fournier H. Rohrer R. Black Arthur Schaffer B. Panzer A. Kreutz Konrad Kleinknecht L. Gatignon C. Cerri I. Mannelli W. Weihs G.d. Barr H.n. Nelson N. Doble P. Grafström M. Calvetti M. Rost R. Casali A. Bigi B. Renk R. Werthenbach D. Coward J. Van Der Lans G. Zech G. Kesseler R. Carosi G.m. Pierazzini Lydia Iconomidou-fayard D.c. Cundy J. Muir D. J. Candlin P. Mayer M. Holder Ph. Heusse H. Burkhardt E. Augé G. Quast A. Nappi

subject

Nuclear physics Physics Nuclear and High Energy Physics Photon Meson Branching fraction Propagator High Energy Physics::Experiment Large sample

description

Abstract A large sample of Dalitz decays, K L → e + e − γ , has been observed. The branching ratio is Γ(K L →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 mesons contributing to the photon propagator.

year	journal	country	edition	language
1990-04-19	Physics Letters B

https://doi.org/10.1016/0370-2693(90)90446-d

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