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

Nonfiction, Science & Nature, Science, Other Sciences, Weights & Measures, Physics, Nuclear Physics
Cover of the book Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC by Manabu Moritsu, Springer Singapore
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: Manabu Moritsu ISBN: 9789811000126
Publisher: Springer Singapore Publication: February 17, 2016
Imprint: Springer Language: English
Author: Manabu Moritsu
ISBN: 9789811000126
Publisher: Springer Singapore
Publication: February 17, 2016
Imprint: Springer
Language: English

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.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

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.

More books from Springer Singapore

Cover of the book Statistical Modeling for Degradation Data by Manabu Moritsu
Cover of the book Advances in Animal Biotechnology and its Applications by Manabu Moritsu
Cover of the book Innovations in Flipping the Language Classroom by Manabu Moritsu
Cover of the book Total Urban Mobilisation by Manabu Moritsu
Cover of the book Theme and Thematic Progression in Chinese College Students’ English Essays by Manabu Moritsu
Cover of the book System Dynamics by Manabu Moritsu
Cover of the book Social Cultural Engineering and the Singaporean State by Manabu Moritsu
Cover of the book Contemporary Logistics in China by Manabu Moritsu
Cover of the book Sustainable Development of Rice and Water Resources in Mainland Southeast Asia and Mekong River Basin by Manabu Moritsu
Cover of the book Towards a Society with Social Protection for All by Manabu Moritsu
Cover of the book Contemporary Conflicts in Southeast Asia by Manabu Moritsu
Cover of the book Intelligent Computing, Networked Control, and Their Engineering Applications by Manabu Moritsu
Cover of the book Humanizing Digital Reality by Manabu Moritsu
Cover of the book Sociological Perspectives on Media Piracy in the Philippines and Vietnam by Manabu Moritsu
Cover of the book Process-Aware Systems by Manabu Moritsu
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy