Abstract:
Based on the field-theory-inspired approach, a new expression for
the pion form factor Fπ is proposed. It takes into account
the pseudoscalar meson loops π+π− and K¯K and the
mixing of ρ(770) with heavier ρ(1450) and ρ(1700)
resonances. The expression possesses correct analytical properties
and describes the data in the wide range of the energy squared
−10≤s≤1 GeV2 without introducing the
phenomenological Blatt–Weisskopf range parameter Rπ.
Citation:
N. N. Achasov, A. A. Kozhevnikov, “Pion form factor in the range −10≤s≤1 GeV2”, Pis'ma v Zh. Èksper. Teoret. Fiz., 96:9 (2012), 627–631; JETP Letters, 96:9 (2012), 559–563