Measurement of the e⁺e⁻ → ηJ/ψ Cross Section and Search for e⁺e⁻ → π⁰J/ψ at Center-Of-Mass Energies Between 3.810 and 4.600 GeV

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Abstract

Using data samples collected with the BESIII detector operating at the BEPCII collider at 17 center-of-mass energies from 3.810 to 4.600 GeV, we perform a study of e⁺e⁻ → ηJ/ψ and π⁰J/ψ The Born cross sections of these two processes are measured at each center-of-mass energy. The measured energy-dependent Born cross section for e⁺e⁻ → ηJ/ψ shows an enhancement around 4.2 GeV. The measurement is compatible with an earlier measurement by Belle.

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Keywords

Mesons—Decay, Particles (Nuclear physics)—Charm, Uncertainty, J/ψ (J/psi) meson, Photons, Atomic mass

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©2015 American Physical Society

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