Measurement of η meson production in γγ interactions and Γ(ηγγ) with the KLOE detector

Abstract

We present a measurement of η meson production in photon-photon interactions produced by electron-positron beams colliding with \( \sqrt{s}=1 \) GeV. The measurement is done with the KLOE detector at the ϕ-factory DAΦNE with an integrated luminosity of 0.24 fb−1. The e + e e + e η cross section is measured without detecting the out-going electron and positron, selecting the decays ηπ + π π 0 and ηπ 0 π 0 π 0. The most relevant background is due to e + e ηγ when the monochromatic photon escapes detection. The cross section for this process is measured as σ(e + e ηγ) = (856 ± 8stat ± 16syst) pb. The combined result for the e + e e + e η cross section is σ(e + e e + e η) = (32.72 ± 1.27stat ± 0.70syst) pb. From this we derive the partial width Γ(ηγγ) = (520 ± 20stat ± 13syst) eV. This is in agreement with the world average and is the most precise measurement to date.

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Correspondence to F. Nguyen or C. Taccini.

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ArXiv ePrint: 1211.1845

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The KLOE-2 collaboration., Babusci, D., Badoni, D. et al. Measurement of η meson production in γγ interactions and Γ(ηγγ) with the KLOE detector. J. High Energ. Phys. 2013, 119 (2013). https://doi.org/10.1007/JHEP01(2013)119

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Keywords

  • e+-e- Experiments