Theoretical analysis on the $K^{-} {}^{3} \text{He} \to \Lambda p n$ reaction in the J-PARC E15 experiment
T. Sekihara*,
E. Oset Baguena and
A. Ramos*: corresponding author
Pre-published on:
February 16, 2018
Published on:
March 20, 2018
Abstract
We theoretically analyze the $K^{-} {}^{3} \text{He} \to \Lambda p n$ reaction for the $\bar{K} N N$ bound-state search in the J-PARC E15 experiment. We find that, by detecting a fast and forward neutron in the final state, an almost on-shell $\bar{K}$ is guaranteed, which is essential to make a bound state with two nucleons from ${}^{3} \text{He}$. Then, this almost on-shell $\bar{K}$ can bring a signal of the $\bar{K} N N$ bound state in the $\Lambda p$ invariant-mass spectrum, although it inevitably brings a kinematic peak above the $\bar{K} N N$ threshold as well. As a consequence, we predict two peaks across the $\bar{K} N N$ threshold in the spectrum: the lower peak coming from the $\bar{K} N N$ bound state, and the higher one originating from the kinematics.
DOI: https://doi.org/10.22323/1.310.0199
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