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Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC/ by Manabu Moritsu.
作者:	Moritsu, Manabu.
面頁冊數:	XIII, 123 p. 86 illus., 38 illus. in color.online resource. :
Contained By:	Springer Nature eBook
標題:	Nuclear physics. -
電子資源:	https://doi.org/10.1007/978-981-10-0012-6
ISBN:	9789811000126

Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC
Moritsu, Manabu.

Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC[electronic resource] /by Manabu Moritsu. - 1st ed. 2016. - XIII, 123 p. 86 illus., 38 illus. in color.online resource. - Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053. - Springer Theses, Recognizing Outstanding Ph.D. Research,.

Introduction to Pentaquark Search -- Experimental Apparatus -- Data Analysis -- Results -- Discussion -- Conclusion -- Appendix.

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.

ISBN: 9789811000126

Standard No.: 10.1007/978-981-10-0012-6doiSubjects--Topical Terms:

591618
Nuclear physics.

LC Class. No.: QC770-798

Dewey Class. No.: 539.7092

Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC
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