Buch, Englisch, 123 Seiten, Previously published in hardcover, Format (B × H): 156 mm x 234 mm, Gewicht: 204 g
Reihe: Springer Theses
Buch, Englisch, 123 Seiten, Previously published in hardcover, Format (B × H): 156 mm x 234 mm, Gewicht: 204 g
Reihe: Springer Theses
ISBN: 978-981-10-9062-2
Verlag: Springer Nature Singapore
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 uudds. 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/c. 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.
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Research
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Weitere Infos & Material
Introduction to Pentaquark Search.- Experimental Apparatus.- Data Analysis.- Results.- Discussion.- Conclusion.- Appendix.
