A search for decay ${\eta }^{\prime }\to 4{\pi }^0$ with GAMS-$4\pi$ Setup

Abstract

A search for rare decay ${\eta }^{\prime }\to 4{\pi }^0$ has been performed with GAMS-4$\pi$ Setup. The new upper limit for decay was established $BR({\eta }^{\prime }\to 4{\pi }^0)<3.2\cdot 10^{-4}$ at 90\% confidence level. The ${\pi }^{-}p$ charge-exchange reaction at 32.5 GeV/c was used as a source of $1.3\cdot 10^6$ ${\eta }^{\prime }$ mesons. Experiment carried out at the IHEP U-70 accelerator.

Comments: 5 pages, 4 figures