Overview
- Nominated as an outstanding contribution by Kyoto University's Physics Department in 2015
- Introduces the current status of the T+ pentaquark search
- Describes details of the experimental apparatus and analysis method of the J-PARC K1.8 beam line and superconducting kaon spectrometer
- Includes supplementary material: sn.pub/extras
Part of the book series: Springer Theses (Springer Theses)
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Table of contents (6 chapters)
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Front Matter
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Back Matter
Keywords
About this book
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.
Authors and Affiliations
About the author
Bibliographic Information
Book Title: Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC
Authors: Manabu Moritsu
Series Title: Springer Theses
DOI: https://doi.org/10.1007/978-981-10-0012-6
Publisher: Springer Singapore
eBook Packages: Physics and Astronomy, Physics and Astronomy (R0)
Copyright Information: Springer Science+Business Media Singapore 2016
Hardcover ISBN: 978-981-10-0010-2Published: 02 March 2016
Softcover ISBN: 978-981-10-9062-2Published: 07 April 2018
eBook ISBN: 978-981-10-0012-6Published: 17 February 2016
Series ISSN: 2190-5053
Series E-ISSN: 2190-5061
Edition Number: 1
Number of Pages: XIII, 123
Number of Illustrations: 48 b/w illustrations, 38 illustrations in colour
Topics: Nuclear Physics, Heavy Ions, Hadrons, Measurement Science and Instrumentation