English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using the field-theory-inspired expression for the pion electromagnetic formfactor F_\pi, a good description of the data in the range -10<s<1 GeV^2 isobtained upon taking into account the pseudoscalar-pseudoscalar (PP) loops.When the vector-pseudoscalar (VP) and the axial vector-pseudoscalar (AP) loopsare taken into account in addition to the PP ones, a good description of theBABAR data on the reaction e^+e^--->pi^+ pi^- is obtained at energies up to 3GeV. The inclusion of the VP and AP loops demands the treatment of thereactions e^+e^---> omega pi^0 and e^+e^---> pi^+ pi^- pi^+ pi^-. This task isalso made, with the SND data on the omega pi^0 production and the BABAR data onthe pi^+ pi^- pi^+ pi^- production, both in e^+e^- annihilation, upon takinginto account \rho(770) and the heavier \rho(1450), \rho(1700), and \rho(2100)resonances. The problems with inclusion of the VP and AP loops are pointed outand discussed.

Pion form factor and reactions e^+e^---> omega pi^0 and e^+e^---> pi^+ pi^- pi^+ pi^- at energies up to 2-3 GeV in the many-channel approach