Search For The Pentaquark I+ Via The Iap A Kax Reaction At J-parc by Manabu MoritsuSearch For The Pentaquark I+ Via The Iap A Kax Reaction At J-parc by Manabu Moritsu

Search For The Pentaquark I+ Via The Iap A Kax Reaction At J-parc

byManabu Moritsu

Hardcover | March 2, 2016

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This theses reports on an experimental search for an exotic hadron, Î+(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 Î+ was strongly constrained. 

The Î+ pentaquark was searched for via the Ï- 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 Î+. 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 Ï- p ' K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 Î¼b/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 Î+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Î+ spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of Î+ was strongly constrained and is doubtful.

Title:Search For The Pentaquark I+ Via The Iap A Kax Reaction At J-parcFormat:HardcoverDimensions:123 pagesPublished:March 2, 2016Publisher:Springer-Verlag/Sci-Tech/TradeLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:9811000107

ISBN - 13:9789811000102

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Table of Contents

Introduction to Pentaquark Search.- Experimental Apparatus.- Data Analysis.- Results.- Discussion.- Conclusion.- Appendix.