First Simultaneous K${}^{-}$p $\to (\hat{I}{\pounds }^0/\hat{I}›)\ddot{I}{€}^0$ Cross Sections Measurements at 98 MeV/c

Abstract

We report the first simultaneous and independent measurements of the K${}^{-}$p $\to \hat{I}{\pounds }^0\ddot{I}{€}^0$ and K${}^{-}$p $\to \hat{I}›\ddot{I}{€}^0$ cross sections around 100 MeV/c kaon momentum. The kaon beam delivered by the DA$\hat{I}¦$NE collider was exploited to detect K${}^{-}$ absorptions on Hydrogen atoms, populating the gas mixture of the KLOE drift chamber. The precision of the measurements ($\ddot{I}{ƒ}_{K^{-}p\to \hat{I}{\pounds }^0\ddot{I}{€}^0}=42.8\pm 1.5(stat.{)}_{-2.0}^{+2.4}(syst.)\mathrm{mb}$ and $\ddot{I}{ƒ}_{K^{-}p\to \hat{I}›\ddot{I}{€}^0}=31.0\pm 0.5(stat.{)}_{-1.2}^{+1.2}(syst.)\mathrm{mb}$) is the highest yet obtained in the low kaon momentum regime.