Search for the Pentaquark T+ via the p-p ¿ K-X Reaction at J-PARC / Springer Theses (PDF)
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This theses reports on an experimental search for an exotic hadron, T+(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 T+ was strongly constrained.
The T+ 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 T+. 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/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 T+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the T+ spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of T+ was strongly constrained and is doubtful.
- Autor: Manabu Moritsu
- 2016, 1st ed. 2016, 123 Seiten, Englisch
- Verlag: Springer-Verlag GmbH
- ISBN-10: 9811000123
- ISBN-13: 9789811000126
- Erscheinungsdatum: 17.02.2016
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