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American Physical Society, Physical Review D, 3(96)

DOI: 10.1103/physrevd.96.034024

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Exposing strangeness: projections for kaon electromagnetic form factors

Journal article published in 2017 by Fei Gao, Lei Chang, Yu-Xin Liu, Craig D. Roberts, Peter C. Tandy
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Data provided by SHERPA/RoMEO

Abstract

A continuum approach to the kaon and pion bound-state problems is used to reveal their electromagnetic structure. For both systems, when used with parton distribution amplitudes appropriate to the scale of the experiment, Standard Model hard-scattering formulae are accurate to within 25% at momentum transfers $Q^2 ≈ 8\,$GeV$^2$. There are measurable differences between the distribution of strange and normal matter within the kaons, e.g. the ratio of their separate contributions reaches a peak value of $1.5$ at $Q^2 ≈ 6\,$GeV$^2$. Its subsequent $Q^2$-evolution is accurately described by the hard scattering formulae. Projections for kaon and pion form factors at timelike momenta beyond the resonance region are also presented. These results and projections should prove useful in planning next-generation experiments. ; Comment: 7 pages, 4 figures