Manabu Moritsu

(Author)

Search for the Pentaquark Θ+ Via the π-P → K-X Reaction at J-Parc (Softcover Reprint of the Original 1st 2016)Paperback - Softcover Reprint of the Original 1st 2016, 7 April 2018

Search for the Pentaquark Θ+ Via the π-P → K-X Reaction at J-Parc (Softcover Reprint of the Original 1st 2016)
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Part of Series
Springer Theses
Print Length
123 pages
Language
English
Publisher
Springer
Date Published
7 Apr 2018
ISBN-10
9811090629
ISBN-13
9789811090622

Description

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.

Product Details

Author:
Manabu Moritsu
Book Edition:
Softcover Reprint of the Original 1st 2016
Book Format:
Paperback
Country of Origin:
NL
Date Published:
7 April 2018
Dimensions:
23.39 x 15.6 x 0.76 cm
ISBN-10:
9811090629
ISBN-13:
9789811090622
Language:
English
Location:
Singapore
Pages:
123
Publisher:
Weight:
204.12 gm

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