Abstract
Based on the field-theory-inspired approach, a new expression for the pion form factor F π is proposed. It takes into account the pseudoscalar meson loops π+π− and \(K\bar K\) and the mixing of ρ(770) with heavier ρ(1450) and ρ(1700) resonances. The expression ensures correct analytical properties and describes the data in the wide range of the energy squared −10 GeV2 ≤ s ≤ 1 GeV2 without introducing the phenomenological Blatt-Weisskopf range parameter R π.
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Achasov, N.N., Kozhevnikov, A.A. Pion form factor in the range −10 GeV2 ≤ s ≤ 1 GeV2 . Jetp Lett. 96, 559–563 (2013). https://doi.org/10.1134/S0021364012210023
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DOI: https://doi.org/10.1134/S0021364012210023