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    • Keywords


      Unitarity; analyticity; zeros.

    • Abstract


      Analyticity and unitarity techniques are employed to estimate Taylor coefficients of the pion electromagnetic form factor at $t = 0$ by exploiting the recently evaluated two-pion contribution to the muon $(g − 2)$ and the phase of the pion electromagnetic form factor in the elastic region, known from $\pi \pi$ scattering by Fermi–Watson theorem and the values of the form factor at several points in the space-like region. Regions in the complex 𝑡-plane are isolated where the form factor cannot have zeros.

    • Author Affiliations


      B Ananthanarayan1 Irinel Caprini2 I Sentitemsu Imsong1

      1. Centre for High Energy Physics, Indian Institute of Science, Bangalore 560 012, India
      2. Horia Hulubei National Institute for Physics and Nuclear Engineering, P.O.B. MG-6, 077125 Magurele, Romania
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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