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Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC / by Manabu Moritsu.
- Format:
- Book
- Thesis/Dissertation
- Author/Creator:
- Moritsu, Manabu., Author.
- Series:
- Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5053
- Language:
- English
- Subjects (All):
- Nuclear physics.
- Heavy ions.
- Physical measurements.
- Measurement.
- Nuclear Physics, Heavy Ions, Hadrons.
- Measurement Science and Instrumentation.
- Local Subjects:
- Nuclear Physics, Heavy Ions, Hadrons.
- Measurement Science and Instrumentation.
- Physical Description:
- 1 online resource (132 p.)
- Edition:
- 1st ed. 2016.
- Place of Publication:
- Singapore : Springer Singapore : Imprint: Springer, 2016.
- Language Note:
- English
- Summary:
- 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.
- Contents:
- Introduction to Pentaquark Search
- Experimental Apparatus
- Data Analysis
- Results
- Discussion
- Conclusion
- Appendix.
- Notes:
- Description based upon print version of record.
- "Doctoral thesis accepted by Kyoto University, Kyoto, Japan"--T.p.
- Includes bibliographical references.
- ISBN:
- 981-10-0012-3
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