Title Search for the Pentaquark ??+ via the ?????p ??? K???X Reaction at J-PARC Author(s) Moritsu, Manabu Publication Singapore, Springer Singapore, 2016. Description XIII, 123 p. 86 illus., 38 illus. in color : online resource Abstract Note This theses reports on an experimental search for an exotic hadron, ??+(1540) pentaquark, which is a genuine exotic hadron with a five-quark system of uuddsbar. The results of this book support that the existence of ??+ was strongly constrained. The ??+ pentaquark was searched for via the ??- 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 ??+. 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 ??? K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 ??b/sr at the 90% confidence level in a mass region of 1500???1560 MeV/c2. 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 ??+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the ??+ spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of ??+ was strongly constrained and is doubtful ISBN,Price 9789811000126 Keyword(s) 1. EBOOK 2. EBOOK - SPRINGER 3. Heavy ions 4. Measurement Science and Instrumentation 5. Measurement?????? 6. NUCLEAR PHYSICS 7. Nuclear Physics, Heavy Ions, Hadrons 8. PHYSICAL MEASUREMENTS Item Type eBook Multi-Media Links Please Click here for eBook Circulation Data Accession#   Call# Status Issued To Return Due On Physical Location I10041     On Shelf