Experimental plan of Sp scattering experiment at J-PARC
Experimental plan of Sp scattering experiment at J-PARC
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J-PARC Sp散射实验的实验计划
DOI：
10.1051/epjconf/20122005001
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Ieiri and J-PARC P40 collaboration
中科院分区：
文献类型：
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作者：
K. Miwa;R. Honda;Y. Matsumoto;H. Kanda;H. Tamura;M. Ieiri and J-PARC P40 collaboration
为了检验重子-重子相互作用的理论框架，首次证实“夸克之间的泡利效应”，我们提出了一个具有高统计量的实验，在以下通道中测量低能超子质子散射截面：1。Σ -塑料散射，2。2 . Σ−p→Λninelastic散射；Σ+ pelastic散射。根据基于夸克-胶子图像的重子-重子相互作用短程部分的理论模型，由于夸克之间的泡利效应，预计theΣ+pchannel具有极排斥核，这使得aΣ+的横截面比具有现象学处理的短程排斥核的传统介子交换模型预测的大两倍。此外，还需要测量不存在夸克泡利效应的theΣ−pchannel，以验证基于具有flavor SU(3)对称性的介子交换图的理论模型。因此，该实验将为检验重子-重子相互作用理论模型的框架和研究尚未被理解的排斥核的性质提供必要的数据。为了克服测量低能超子质子散射的实验困难，我们将采用一种新的实验技术，即使用液体H2target作为超子产生和超子散射的目标，并在LH2target周围安装探测器系统来检测超子的散射质子和衰变产物。对超子散射事件进行了运动学辨识。由于没有使用以往实验中使用的成像探测器，因此可以使用高强度π光束，使我们能够获得比以往实验高100倍的高统计数据。我们利用K1.8束流谱线光谱仪和SKS光谱仪在K1.8束流线上提出了一个实验ofΣpscattering。对于theΣ−andΣ+产品，分别以1.32 GeV/c和1.42 GeV/c的高强度π光束2×107/spill被用来产生尽可能多的超子束。在500 MeV/c左右的16×106Σ -光束和55×106Σ+光束中，我们将在60天的光束时间内检测到~10,000Σ−pandΣ+p散射事件和~6,000Σ−p→Λninelastic反应事件。在这篇论文中，我们将介绍散射实验的实验计划和详细的模拟研究结果。
In order to test theoretical frameworks of the baryon-baryon interactions and to confirm the ”Pauli effect between quarks” for the first time, we propose an experiment to measure low-energy hyperon proton scattering cross sections in the following channels with high statistics, 1.Σ−pelastic scattering, 2.Σ−p →Λninelastic scattering, 3.Σ+pelastic scattering. According to theoretical models based on quark-gluon picture for the short range part of the baryon-baryon interactions, theΣ+pchannel is expected to have an extremely repulsive core due to the Pauli effect between quarks, which leads aΣ+pcross section twice as large as that predicted by conventional meson exchange models with a phenomenologically treated short range repulsive core. In addition, measurement of theΣ−pchannel where the quark Pauli effect is not effective is also necessary to test the present theoretical models based on meson exchange picture with the flavor SU(3) symmetry. Thus this experiment will provide essential data to test the frameworks of the theoretical models of the baryon-baryon interactions and to investigate the nature of the repulsive core which has not been understood yet.In order to overcome the experimental difficulties in measuring low-energy hyperon proton scattering, we will use a new experimental technique in which a liquid H2target is used as hyperon production and hyperon scattering targets with a detector system surrounding the LH2target for detection of a scattered proton and a decay product from a hyperon. The hyperon scattering event is kinematically identified. Because imaging detectors used in past experiments are not employed, high intensityπbeam can be used, allowing us to take high statistics data of 100 times more than the previous experiments. We have proposed an experiment ofΣpscattering at the K1.8 beam line by utilizing the K1.8 beam line spectrometer and the SKS spectrometer. A high intensityπbeams of 2×107/spill at 1.32 GeV/cand 1.42 GeV/cfor theΣ−andΣ+productions, respectively, are used to produce as many hyperon beam as possible.With 16×106Σ−beam and 55×106Σ+beam around 500 MeV/cwhich are tagged by the spectrometers, we will detect ~10,000Σ−pandΣ+pscattering events and ~6,000Σ−p →Λninelastic reaction events in 60 days beam time in total.In this proceedings, we will present the experimental plan of the scattering experiment and results of the detailed simulation studies.