Search for the deeply bound $K^{-}pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^{-}$ reaction on helium-3

Abstract

An experiment to search for the $K^{-}pp$ bound state was performed via the in-flight ${}^3$He($K^{-},n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at ${\theta }_n^{lab}=0^{\circ }$, no significant peak was observed in the region corresponding to $K^{-}pp$ binding energy larger than 80 MeV, where a bump structure has been reported in the $\Lambda p$ final state in different reactions. Assuming the state to be isotropically decaying into $\Lambda p$, mass-dependent upper limits on the production cross section were determined to be 30--180, 70--250, and 100--270 $\mu$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95\% confidence level.

arXiv comment12 pages, 6 figures

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Cited by in corpus (13)

• Strangeness in nuclear physics
• Exotic hadrons: review and perspectives
• Partial Wave Analysis of the Reaction $p(3.5GeV)+p\to p{K}^{+}\Lambda$ to Search for the "$pp{K}^{-}$" Bound State
• Structure near $K^{-}$+$p$+$p$ threshold in the in-flight ${}^3$He$(K^{-},\Lambda p)n$ reaction
• Observation of a $\bar{K}NN$ bound state in the ${}^3\mathrm{He}(K^{-},\Lambda p)n$ reaction
• Construction of a local barK N-pi Sigma-pi Lambda potential and composition of the Lambda(1405)
• Has a "$pp{K}^{-}$" Signal in p+p Reactions been Observed Yet?
• Application of a coupled-channel Complex Scaling Method with Feshbach projection to the $K^{-}pp$ system
• Pole position of $\Lambda (1405)$ measured in $d(K^{-},n)\pi \Sigma$ reactions
• MESON2016 -- Concluding Remarks
• Kaon pair production in proton-nucleus collisions at 2.83 GeV kinetic energy
• The Peak Structure in the In-Flight ${}^3\text{He}(K^{-},\Lambda p)n$ Reaction Around the $\bar{K}NN$ Threshold
• Investigation of $K^{bar}NN$ resonances with a coupled-channel Complex Scaling Method + Feshbach projection