Feasibility study of the → Reaction for the θ Pentaquark Letter of intent for study of exotic hadrons with And Rare Decay with low-momentum kaon beam at J-PARC Letter of intent for search for Hypernuclei Using Reaction
Takayasu Sekihara (Advanced Science Research Center, Japan Atomic Energy Agency, Shirakata, , Tokai, Ibaraki 319-1195, , Japan); Hyun-Chul Kim (Advanced Science Research Center, Japan Atomic Energy Agency, Shirakata, , Tokai, Ibaraki 319-1195, , Japan); Atsushi Hosaka (Advanced Science Research Center, Japan Atomic Energy Agency, Shirakata, , Tokai, Ibaraki 319-1195, , Japan)
Abstract We investigate theoretically the invariant mass spectrum of the reaction and scrutinize how the signal of the “” pentaquark, if it exists, emerges in the spectrum. The most prominent advantage of this reaction is that we can clearly assess whether the “” exists or not as a direct-formation production without significant backgrounds, in contrast to other reactions such as photoproduction and -induced productions. We show that while the impulse or single-step scattering process can cover the “” energy region with an initial kaon momentum in the laboratory frame, the contributions from double-step processes may have a potential possibility to reach the “” energy region with a higher kaon momentum . Assuming that the full decay width of the “” is around , we predict that the magnitude of the peak corresponding to the “” is around a few hundred to with the momentum of the kaon beam while it is around with . Thus, the “” peak is more likely to be seen at than at .
