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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Two-pion production in proton-proton collisions near threshold
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Two-pion production in proton-proton collisions near threshold

机译:接近阈值的质子-质子碰撞中的两点生成

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Two-pion production reactions in proton-proton collisions have been studied using the PROMICE/WASA detector and an internal cluster gas-jet target at the CELSIUS storage ring in Uppsala. The total cross sections for the pp --> pppi(+)pi(-), pp --> pppi(0)pi(0) and the pp --> pnpi(0)pi(+) reactions are presented at beam energies ranging from 650 to 775 MeV. An isospin analysis of the amplitudes involved in these three reactions indicates that the excitation of the N* (1440) followed by direct two pion emission can be the most important amplitude when allowed. However, large contributions from other production mechanisms must also be prevalent to explain the large pp --> pnpi(0)pi(+) cross section. The data are compared to an extensive model including non-resonant as well as resonant production via N* and Delta excitation. [References: 10]
机译:使用PROMICE / WASA检测器和位于乌普萨拉CELSIUS存储环的内部簇状气体喷射靶,研究了质子-质子碰撞中的两价生成反应。 pp-> pppi(+)pi(-),pp-> pppi(0)pi(0)和pp-> pnpi(0)pi(+)反应的总横截面显示在光束处能量范围从650到775 MeV。对这三个反应所涉及的振幅的同位旋分析表明,如果允许,激发N *(1440)并随后直接发射两个π离子可能是最重要的振幅。但是,其他生产机制的巨大贡献也必须普遍用于解释大的pp-> pnpi(0)pi(+)横截面。将该数据与包括非共振以及通过N *和Delta激发产生共振的广泛模型进行比较。 [参考:10]

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