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Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC: (Springer Theses)

Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC: (Springer Theses)


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About the Book

This theses reports on an experimental search for an exotic hadron, Θ+(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 Θ+ was strongly constrained.  The Θ+ pentaquark was searched for via the π- 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 Θ+. 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 π- 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/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 Θ+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Θ+ spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of Θ+ was strongly constrained and is doubtful.

Table of Contents:
Introduction to Pentaquark Search.- Experimental Apparatus.- Data Analysis.- Results.- Discussion.- Conclusion.- Appendix.

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Product Details
  • ISBN-13: 9789811000102
  • Publisher: Springer Verlag, Singapore
  • Publisher Imprint: Springer Verlag, Singapore
  • Height: 235 mm
  • No of Pages: 123
  • Returnable: Y
  • Width: 155 mm
  • ISBN-10: 9811000107
  • Publisher Date: 02 Mar 2016
  • Binding: Hardback
  • Language: English
  • Returnable: Y
  • Series Title: Springer Theses


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Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC: (Springer Theses)
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