Lung, A.
FORM-FACTOR
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Proof of comparable K pair and pi pair production from time-like photons of 1.5-GeV, 1.6-GeV, and 1.7-GeV and determination of the K meson electromagnetic form factor.

Bernardini, M. ; Bollini, D. ; Brunini, P.L. ; et al.
Phys.Lett.B 44 (1973) 393-396, 1973.
Inspire Record 85276 DOI 10.17182/hepdata.28101

The observation of 21 K + K − pairs in 38 hadron pair events produced at 1.5, 1.6, and 1.7 GeV total centre-of-mass energies in e + e − annihilations, establishes that time-like photons produce K pairs and π pairs with comparable rates in this energy range. The K-meson electromagnetic form factor at a mean s -value of 2.4 GeV 2 is measured to be | F K | = 0.50±0.08. The number of e + e − pairs observed in the same angular and energy range is 5148.

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