Springer Theses / Search for the Pentaquark + via the pi-p K-X Reaction at J-PARC
(Sprache: Englisch)
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...
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Klappentext zu „Springer Theses / Search for the Pentaquark + via the pi-p K-X Reaction at J-PARC “
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 pi- 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 pi- p K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 mib/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.
Inhaltsverzeichnis zu „Springer Theses / Search for the Pentaquark + via the pi-p K-X Reaction at J-PARC “
Introduction to Pentaquark Search.- Experimental Apparatus.- Data Analysis.- Results.- Discussion.- Conclusion.- Appendix.
Bibliographische Angaben
- Autor: Manabu Moritsu
- 2016, 1st ed. 2016, XIII, 123 Seiten, 38 farbige Abbildungen, Masse: 16 x 24,1 cm, Gebunden, Englisch
- Verlag: Springer, Berlin
- ISBN-10: 9811000107
- ISBN-13: 9789811000102
- Erscheinungsdatum: 02.03.2016
Sprache:
Englisch
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