Search for the Pentaquark Ø+ via the p-p  K-X Reaction at J-PARC

This theses reports on an experimental search for an exotic hadron, Ø ⁺ (1540) pentaquark, which is a genuine exotic hadron with a five-quark system of uudds ^bar . The results of this book support that the existence of Ø ⁺ was strongly constrained.

The Ø ⁺ pentaquark was searched for via the p ^- p K ^- X reaction using a beam momentum of 2.01 GeV/c at the J-PARC hadron experimental facility, taking advantage of high-statistics and high-resolution compared with previous experiments, some of which claimed the evidence of Ø ⁺ . In order to realize a good missing-mass resolution of 2 MeV, the beam spectrometer and superconducting kaon spectrometer were constructed.

No clear peak was observed in the missing mass spectrum of the p ^- p K ^- X reaction, and the upper limit of the production cross section was found to be less than 0.28 µb/sr at the 90% confidence level in a mass region of 1500-1560 MeV/c ² . This upper limit is an order of magnitude smaller than that of the previous KEK experiment. Compared with a theoretical calculation using the effective Lagrangian approach, the decay width of Ø ⁺ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Ø ⁺ spin-parity of 1/2 ⁺ and 1/2 ^- , respectively. These are quite small for a width of ordinary hadron resonances, and the existence of Ø ⁺ was strongly constrained and is doubtful.