Proposal for J-PARC 50 GeV Proton Synchrotron High-resolution Search for Θ + Pentaquark in π − p → K − X Reactions

Proposal for J-PARC 50 GeV Proton Synchrotron High-resolution Search for Θ + Pentaquark in π − p → K − X Reactions
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J-PARC 50 GeV 质子同步加速器高分辨率搜索 π − p → K − X 反应中的 θ + 五夸克提案

DOI:
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发表时间:
2006
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通讯作者:
Y. Nakatsugawa
Y. Nakatsugawa
中科院分区:
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文献类型:
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作者:
M. Naruki;S. Ishimoto;T. Maruta;Y. Sato;S. Sawada;M. Sekimoto;H. Takahashi;T. Takahashi;A. Toyoda;K. Miwa;Y. Nakatsugawa

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我们提出了在J-PARC K1.8束线上通过p(π−,K−)反应寻找Θ+五夸克态共振的实验方案。该实验是KEK-PS E522的自然扩展。与采用相同反应的E522相比,我们将积累100倍以上的统计数据,质量分辨率提高5倍(2.5 MeV FWHM),信噪比提高2-10倍。结合这些改进,对于窄的Θ+(r < 2 MeV),预期灵敏度将为75 nb/sr,对于r = 10 MeV,预期灵敏度将为150 nb/sr。此外,如果发现一个Θ+峰,我们可以确定它的宽度低至2 MeV。
We propose an experimental search for the Θ+pentaquark resonance by the p(π−,K−) reaction at the J-PARC K1.8 beamline. This experiment is a natural expansion of KEK-PS E522. Compared to E522, where the same reaction was employed, we will accumulate 100 times more statistics with five times better mass resolution (∼ 2.5 MeV FWHM) and 2-10 times better S/N ratio. With those improvements combined, the expected sensitivity will be 75 nb/sr for a narrow Θ+ (Γ < 2 MeV), and 150 nb/sr for Γ = 10 MeV. Also, if a Θ+ peak is found, we can determine its width down to 2 MeV.