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Anotace knihy

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 uudds bar . 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/c 2 . 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.

Parametry knihy

• Plný název: Search for the Pentaquark + via the p K X Reaction at J-PARC
• Autor: Manabu Moritsu
• Jazyk: Angličtina
• Vazba: Brožovaná
• Počet stran: 123
• EAN: 9789811090622
• ID: 20095059
• Nakladatelství: Springer Verlag, Singapore
• Hmotnost: 454 g
• Rozměry: 235 × 155 × 8 mm
• Datum vydání: 07. April 2018

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