{"product_id":"search-for-the-pentaquark-manabu-moritsu-9789811090622","title":"Search for the Pentaquark \u0026#920;+ Via the \u0026#960;-P \u0026#8594; K-X Reaction at J-Parc","description":"\u003cp\u003eThis theses reports on an experimental search for an exotic hadron, Θ\u003csup\u003e+\u003c\/sup\u003e(1540) pentaquark, which is a genuine exotic hadron with a five-quark system of uudds\u003csup\u003ebar\u003c\/sup\u003e. The results of this book support that the existence of Θ\u003csup\u003e+\u003c\/sup\u003e was strongly constrained. \u003c\/p\u003e \u003cp\u003eThe Θ\u003csup\u003e+\u003c\/sup\u003e pentaquark was searched for via the π\u003csup\u003e-\u003c\/sup\u003e p → K\u003csup\u003e-\u003c\/sup\u003e 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\u003csup\u003e+\u003c\/sup\u003e. In order to realize a good missing-mass resolution of 2 MeV, the beam spectrometer and superconducting kaon spectrometer were constructed.\u003c\/p\u003e \u003cp\u003eNo clear peak was observed in the missing mass spectrum of the π\u003csup\u003e-\u003c\/sup\u003e p → K\u003csup\u003e-\u003c\/sup\u003e 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\/c\u003csup\u003e2\u003c\/sup\u003e. 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\u003csup\u003e+\u003c\/sup\u003e was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Θ\u003csup\u003e+\u003c\/sup\u003e spin-parity of 1\/2\u003csup\u003e+\u003c\/sup\u003e and 1\/2\u003csup\u003e-\u003c\/sup\u003e, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of Θ\u003csup\u003e+\u003c\/sup\u003e was strongly constrained and is doubtful.\u003c\/p\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAuthor:\u003c\/b\u003e Manabu Moritsu\u003cbr\u003e\u003cb\u003eISBN-10:\u003c\/b\u003e 9811090629\u003cbr\u003e\u003cb\u003eISBN-13:\u003c\/b\u003e 9789811090622\u003cbr\u003e\u003cb\u003ePublisher:\u003c\/b\u003e Springer\u003cbr\u003e\u003cb\u003eLanguage:\u003c\/b\u003e English\u003cbr\u003e\u003cb\u003ePublished:\u003c\/b\u003e 04\/07\/2018\u003cbr\u003e\u003cb\u003ePages:\u003c\/b\u003e 123\u003cbr\u003e\u003cb\u003eFormat:\u003c\/b\u003e Paperback\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 0.45lbs\u003cbr\u003e\u003cb\u003eSize:\u003c\/b\u003e 9.21h x 6.14w x 0.30d","brand":"Manabu Moritsu","offers":[{"title":"Paperback","offer_id":47425478885631,"sku":"9789811090622","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/2982\/9887\/files\/img_f69fc42e-a419-451c-b2c9-80569b29dcb5.jpg?v=1761539501","url":"https:\/\/www.whiterainbookhouse.com\/products\/search-for-the-pentaquark-manabu-moritsu-9789811090622","provider":"WR Book House","version":"1.0","type":"link"}