Search for Θ+ in K+d→K0pp reaction at J-PARC

We propose to search for Θ + in K + d → K 0 p p reaction at p K + =0.5 GeV/c at J-PARC. A large acceptance Hyperon Spectrometer, which consists mainly of a time projection chamber and a 1-T superconducting magnet, will exclusively measure the decay products of Θ + , such that Θ + → K 0 p , followed by K 0 → π + π - , with a mass resolution of 1 MeV at M Θ . We investigated the feasibility of the proposed experiment using a Monte Carlo simulation. As a result, we expect to collect five orders of magnitude Θ + events, assuming a cross section of 300 μ b in 15-day beam time at J-PARC.