Springer Theses: Search for the Pentaquark Theta^+ Via the Pi^- P --> K- X Reaction at J-Parc 0 by Manabu Moritsu read book DOC, DJV
9789811000102 9811000107 This book reports on an experimental search for an exotic hadron, Q+(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 Q+ was strongly constrained. The Q+ pentaquark was searched for via the p- p à 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 comparing to previous experiments, some of which claimed the evidence of Q+. 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 p- p à K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 mb/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. Compering with a theoretical calculation using the effective Lagrangian approach, the decay width of Q+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Q+ spin-parity of 1/2+and 1/2-, respectively. These are quite small for a wid th of ordinary hadron resonances, and the existence of Q+ was strongly constrained and is doubtful., This theses reports on an experimental search for an exotic hadron, +(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 + was strongly constrained. The + pentaquark was searched for via the - 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 +. 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 - p K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 b/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 + was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the + spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of + was strongly constrained and is doubtful. ", This theses reports on an experimental search for an exotic hadron, Q+(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 Q+ was strongly constrained. The Q+ pentaquark was searched for via the p- p a 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 Q+. 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 p- p a K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 mb/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 Q+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Q+ spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of Q+ was strongly constrained and is doubtful. ", Thistheses reports on an experimental search for an exotic hadron, &ThΗ+(1540)pentaquark, which is a genuine exotic hadron with a five-quark system of uuddsbar. Theresults of this book support that the existence of &ThΗ+ wasstrongly constrained. The &ThΗ+ pentaquark was searched for via the ÃŽÂ - p ⇒ K- Xreaction using a beam momentum of 2.01 GeV/c at the J-PARC hadron experimentalfacility, taking advantage of high-statistics and high-resolution compared withprevious experiments, some of which claimed the evidence of &ThΗ+. Inorder to realize a good missing-mass resolution of 2 MeV, the beam spectrometerand superconducting kaon spectrometer were constructed. No clear peak was observed in the missing mass spectrum of the ÃŽÂ - p ⇒ K- Xreaction, and the upper limit of the production cross section was found to beless than 0.28 ÃŽÂœb/sr at the 90% confidence level in a mass region of1500-1560 MeV/c2. This upper limit is an order of magnitude smallerthan that of the previous KEK experiment. Compared with a theoreticalcalculation using the effective Lagrangian approach, the decay width of &ThΗ+ wasevaluated. The upper limits on the decay width were estimated to be 0.36 and1.9 MeV for the &ThΗ+ spin-parity of 1/2+ and 1/2-,respectively. These are quite small for a width of ordinary hadron resonances,and the existence of &ThΗ+ was strongly constrained and isdoubtful., Thistheses 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. Theresults of this book support that the existence of Θ+ wasstrongly constrained. The Θ+ pentaquark was searched for via the À- p → K- Xreaction using a beam momentum of 2.01 GeV/c at the J-PARC hadron experimentalfacility, taking advantage of high-statistics and high-resolution compared withprevious experiments, some of which claimed the evidence of Θ+. Inorder to realize a good missing-mass resolution of 2 MeV, the beam spectrometerand superconducting kaon spectrometer were constructed. No clear peak was observed in the missing mass spectrum of the À- p → K- Xreaction, and the upper limit of the production cross section was found to beless than 0.28 ÃŽÅ’b/sr at the 90% confidence level in a mass region of1500-1560 MeV/c2. This upper limit is an order of magnitude smallerthan that of the previous KEK experiment. Compared with a theoreticalcalculation using the effective Lagrangian approach, the decay width of Θ+ wasevaluated. The upper limits on the decay width were estimated to be 0.36 and1.9 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 isdoubtful.
9789811000102 9811000107 This book reports on an experimental search for an exotic hadron, Q+(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 Q+ was strongly constrained. The Q+ pentaquark was searched for via the p- p à 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 comparing to previous experiments, some of which claimed the evidence of Q+. 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 p- p à K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 mb/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. Compering with a theoretical calculation using the effective Lagrangian approach, the decay width of Q+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Q+ spin-parity of 1/2+and 1/2-, respectively. These are quite small for a wid th of ordinary hadron resonances, and the existence of Q+ was strongly constrained and is doubtful., This theses reports on an experimental search for an exotic hadron, +(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 + was strongly constrained. The + pentaquark was searched for via the - 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 +. 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 - p K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 b/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 + was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the + spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of + was strongly constrained and is doubtful. ", This theses reports on an experimental search for an exotic hadron, Q+(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 Q+ was strongly constrained. The Q+ pentaquark was searched for via the p- p a 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 Q+. 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 p- p a K- X reaction, and the upper limit of the production cross section was found to be less than 0.28 mb/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 Q+ was evaluated. The upper limits on the decay width were estimated to be 0.36 and 1.9 MeV for the Q+ spin-parity of 1/2+ and 1/2-, respectively. These are quite small for a width of ordinary hadron resonances, and the existence of Q+ was strongly constrained and is doubtful. ", Thistheses reports on an experimental search for an exotic hadron, &ThΗ+(1540)pentaquark, which is a genuine exotic hadron with a five-quark system of uuddsbar. Theresults of this book support that the existence of &ThΗ+ wasstrongly constrained. The &ThΗ+ pentaquark was searched for via the ÃŽÂ - p ⇒ K- Xreaction using a beam momentum of 2.01 GeV/c at the J-PARC hadron experimentalfacility, taking advantage of high-statistics and high-resolution compared withprevious experiments, some of which claimed the evidence of &ThΗ+. Inorder to realize a good missing-mass resolution of 2 MeV, the beam spectrometerand superconducting kaon spectrometer were constructed. No clear peak was observed in the missing mass spectrum of the ÃŽÂ - p ⇒ K- Xreaction, and the upper limit of the production cross section was found to beless than 0.28 ÃŽÂœb/sr at the 90% confidence level in a mass region of1500-1560 MeV/c2. This upper limit is an order of magnitude smallerthan that of the previous KEK experiment. Compared with a theoreticalcalculation using the effective Lagrangian approach, the decay width of &ThΗ+ wasevaluated. The upper limits on the decay width were estimated to be 0.36 and1.9 MeV for the &ThΗ+ spin-parity of 1/2+ and 1/2-,respectively. These are quite small for a width of ordinary hadron resonances,and the existence of &ThΗ+ was strongly constrained and isdoubtful., Thistheses 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. Theresults of this book support that the existence of Θ+ wasstrongly constrained. The Θ+ pentaquark was searched for via the À- p → K- Xreaction using a beam momentum of 2.01 GeV/c at the J-PARC hadron experimentalfacility, taking advantage of high-statistics and high-resolution compared withprevious experiments, some of which claimed the evidence of Θ+. Inorder to realize a good missing-mass resolution of 2 MeV, the beam spectrometerand superconducting kaon spectrometer were constructed. No clear peak was observed in the missing mass spectrum of the À- p → K- Xreaction, and the upper limit of the production cross section was found to beless than 0.28 ÃŽÅ’b/sr at the 90% confidence level in a mass region of1500-1560 MeV/c2. This upper limit is an order of magnitude smallerthan that of the previous KEK experiment. Compared with a theoreticalcalculation using the effective Lagrangian approach, the decay width of Θ+ wasevaluated. The upper limits on the decay width were estimated to be 0.36 and1.9 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 isdoubtful.