{"product_id":"search-for-the-pentaquark-t-via-the-p-p-k-x-reaction-at-j-parc-von-manabu-moritsu","title":"Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC","description":"\n                \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\n\n\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\n\n\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\n            \u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9789811000102\"\u003e\u003ch3\u003e\u003c\/h3\u003e\u003c\/div\u003e","brand":"Libri","offers":[{"title":"Hardcover - 9789811000102","offer_id":28563646677085,"sku":"9789811000102","price":106.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/73461_d5ed730b-1b65-4eb9-a9cd-6d81df5cc048.jpg?v=1784521154","url":"https:\/\/shop.autorenwelt.de\/products\/search-for-the-pentaquark-t-via-the-p-p-k-x-reaction-at-j-parc-von-manabu-moritsu","provider":"Autorenwelt Shop","version":"1.0","type":"link"}