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arXiv 0802.2331nucl-ex
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束流能量为390 MeV时${\vec p}p{\to}ppπ^0$反应的微分截面和分析本领

Differential cross section and analyzing power of the ${\vec p}p{\to}ppπ^0$ reaction at a beam energy of 390 MeV

Y. Maeda, M. Segawa, T. Ishida, A. Kacharava, M. Nomachi, Y. Shimbara, Y. Sugaya, K. Tamura, T. Yagita, K. Yasuda, H. P. Yoshida, C. Wilkin

摘要:

微分截面和分析功率$A_y$的${\vec p}p{\to}ppπ^0$反应已被测量在RCNP在共面几何在束能量为390 MeV和依赖于π发射角和相对动量的最终质子已被提取。这里研究的相对动量大值时Ay的角度变化表明,这主要是π s波和p波干涉的影响,这种干涉也可以解释动量依赖性。在一个非常简单的模型的框架内,这些结果表明,π介子生产运营商有一个显着的远程组件。

英文摘要:

The differential cross section and analyzing power $A_y$ of the ${\vec p}p{\to}ppπ^0$ reaction have been measured at RCNP in coplanar geometry at a beam energy of 390 MeV and the dependence on both the pion emission angle and the relative momentum of the final protons have been extracted. The angular variation of Ay for the large values of the relative momentum studied here shows that this is primarily an effect of the interference of pion s- and p-waves and this interference can also explain the momentum dependence. Within the framework of a very simple model, these results would suggest that the pion-production operator has a significant long-range component.

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