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Study of the π~0π~0-system with the GAMS-4000 spectrometer at 100 GeV/c

机译:GAMS-4000光谱仪在100 GeV / c下研究π〜0π〜0系统

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The π~0π~0-system produced in the charge exchange π~-p-reaction at 100 GeV/c has been studied. The experiment was performed at the CERN SPS accelerator with the multiphoton hodoscope spectrometer GAMS-4000. A partial wave analysis was carried out in the mass range from 0.8 GeV to 3.0 GeV at -t < 0.2 (GeV/c)~2 with the S, D, G and J waves. The S-wave exhibits rather complicated behaviour with a series of four bumps separated by three dips, at 1 GeV, 1.5 GeV and 2 GeV, which give the evidence for several scalar resonances. Clear peaks corresponding to the f_2(1270), f_4(2050) and f_6(2510) mesons are seen in the higher waves. All the three mesons are produced via a dominating one pion t-channel exchange. The parameters and production cross sections of these mesons are measured.
机译:研究了在100 GeV / c的电荷交换π〜-p反应中产生的π〜0π〜0系统。该实验是在CERN SPS加速器上使用多光子体视光谱仪GAMS-4000进行的。用S,D,G和J波在-t <0.2(GeV / c)〜2的质量范围从0.8 GeV到3.0 GeV进行了部分波分析。 S波表现出相当复杂的行为,在1个GeV,1.5个GeV和2个GeV处有一系列由三个谷点隔开的四个凸点,这为几个标量共振提供了证据。在较高的波浪中可以看到与f_2(1270),f_4(2050)和f_6(2510)介子相对应的清晰峰。这三个介子都是通过一个主要的介子t通道交换产生的。测量这些介子的参数和生产截面。

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