Narrow resonances studies with the radiative return method

Abstract

Using the radiative return method, experiments at high luminosity electron-positron colliders allow to explore the kaon and the pion form factors in the time-like region up to fairly high energies. This opens the possibility to study kaon and pion pair production at and around the narrow resonances J/psi and psi(2S) and explore the interference between electromagnetic and hadronic amplitudes. Parameterizations of charged and neutral kaon as well as pion form factors are derived, which lead to an improved description of the data in the region of large invariant masses of the meson pair. These form factors are combined with the hadronic couplings of charged and neutral kaons to J/psi and psi(2S) and implemented into the Monte Carlo generator PHOKHARA, which is now, for the first time, able to simulate the production of narrow resonances and their decay into kaon, pion and muon pairs.

Changes from v1: typos removed, different fit parameters for rho_4 and rho_5 in the pion form factor

References in corpus (7)

• Measurement of the e+e- -> pi+pi- cross section with the CMD-2 detector in the 370-520 MeV c.m. energy range
• Spin asymmetries and correlations in lambda-pair production through the radiative return method
• Four-pion production in tau decays and e+e- annihilation: an update
• Experimental Study of the Reaction $e^{+}{e}^{-}\to K_S{K}_L$ in the Energy Range $\sqrt{s}=1.04÷1.38$ GeV
• Measurement of the e+e- -> K+K- cross section in the energy range s**(1/2) = 1.04 - 1.38 GeV with the SND detector in the experiment at the VEPP-2M e+e- collider
• Strong and Electromagnetic J/psi and psi(2S) Decays into Pion and Kaon Pairs
• Timelike Form Factor of the Kaon for |Q^2|=M^2(J/psi)

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