Searches for rare and forbidden neutral decays of η mesons at the GAMS-4π facility |
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| Authors: | A M Blik A M Gorin S V Donskov S Inaba V N Kolosov M E Ladygin A A Lednev V A Lishin I V Manuilov Yu V Mikhailov V A Polyakov V D Samoylenko A E Sobol V P Sugonyaev K Takamatsu T Tsuru G V Khaustov |
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| Institution: | (1) Institute for High Energy Physics, Protvino, Moscow oblast, 142284, Russia;(2) High Energy Accelerator Research Organization, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan |
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| Abstract: | Searches for rare and forbidden neutral decays of η mesons are performed at the GAMS-4π facility. A charge-exchange reaction at an initial momentum of 32.5 GeV/c was used as a source of 3.7 × 106 η mesons. The following upper limits are established at a 90% confidence level: Br(η → 3γ) < 1.6 × 10?4, Br(η → 4γ) < 2.8 × 10?4, Br(η → π0π0) < 3.5 × 10?4, Br(η → π0π0γ) < 1.7 × 10?3, Br(η → π0π0γγ) < 4.0 × 10?3, Br(η → 3π0γ) < 2.4 × 10?4, and Br(η → 4π0) < 2.0 × 10?5. |
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