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arXiv 0907.4478nucl-ex
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在FAIR用PANDA进行类时质子电磁形状因子测量的可行性研究

Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR

M. Sudol, M. C. Mora Espi, E. Becheva, J. Boucher, T. Hennino, R. Kunne, D. Marchand, S. Ong, B. Ramstein, J. Van de Wiele, T. Zerguerras, F. Maas, B. Kopf, M. … 展开作者

M. Sudol, M. C. Mora Espi, E. Becheva, J. Boucher, T. Hennino, R. Kunne, D. Marchand, S. Ong, B. Ramstein, J. Van de Wiele, T. Zerguerras, F. Maas, B. Kopf, M. Pelizaeus, M. Steinke, J. Zhong, E. Tomasi-Gustafsson

摘要:

讨论了用\PANDA探测器在FAIR上测量类时区质子电磁形状因子的可能性。详细模拟了$\bar p +p $湮灭为轻子对以及最重要的背景通道的信号效率。它表明,反应$\bar p +p \to e^++ e^-$的微分截面的精确测量,可以得到在一个广泛的角度和运动学范围。电和磁质子形状因子的模量的单独确定将是可能的,直到$q^2\simeq 14$(GeV/c)$^2$的动量传递平方值。测量总$\bar p +p\to e^++e^-$横截面,直至达到$q^2\simeq 28$(GeV/c)$^2$。从模拟事件得到的结果进行比较,现有的数据。还研究了双光子交换机制的灵敏度。

英文摘要:

The possibility of measuring the proton electromagnetic form factors in the time-like region at FAIR with the \PANDA detector is discussed. Detailed simulations on signal efficiency for the annihilation of $\bar p +p $ into a lepton pair as well as for the most important background channels have been performed. It is shown that precision measurements of the differential cross section of the reaction $\bar p +p \to e^++ e^-$ can be obtained in a wide angular and kinematical range. The individual determination of the moduli of the electric and magnetic proton form factors will be possible up to a value of momentum transfer squared of $q^2\simeq 14$ (GeV/c)$^2$. The total $\bar p +p\to e^++e^-$ cross section will be measured up to $q^2\simeq 28$ (GeV/c)$^2$. The results obtained from simulated events are compared to the existing data. Sensitivity to the two photons exchange mechanism is also investigated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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