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arXiv 1204.0263hep-ph
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在LHC对撞机上超相对论离子碰撞中束缚-自由对的产生:全截面和微分截面的解析方法

Bound-free pair production in ultra-relativistic ion collisions at the LHC collider: Analytic approach to the total and differential cross sections

A. N. Artemyev, U. D. Jentschura, V. G. Serbo, A. Surzhykov

摘要:

对相对论重离子碰撞中束缚-自由电子-正电子对的产生进行了理论研究.特别注意的是大角度下发射的正电子相对于束流方向。用LHC实验测量这些与负电荷离子相符合的正电子,原则上是可行的。为了提供可靠的估计,这样的测量,我们采用等效光子近似与Sauter的方法,并推导出简单的解析表达式的差分对-生产截面,比较有利的结果可用的数值计算。在此基础上,结合LHC实验中典型的实验条件,对Pb $^{82+}$裸离子的碰撞进行了详细的计算.我们发现,预期的计数率强烈依赖于实验参数,并可能会显着提高通过增加正电子探测器的接受锥。

英文摘要:

A theoretical investigation of the bound-free electron-positron pair production in relativistic heavy ion collisions is presented. Special attention is paid to the positrons emitted under large angles with respect to the beam direction. The measurement of these positrons in coincidence with the down--charged ions is in principle feasible by LHC experiments. In order to provide reliable estimates for such measurements, we employ the equivalent photon approximation together with the Sauter approach and derive simple analytic expressions for the differential pair--production cross section, which compare favorably to the results of available numerical calculations. Based on the analytic expressions, detailed calculations are performed for collisions of bare Pb$^{82+}$ ions, taking typical experimental conditions of the LHC experiments into account. We find that the expected count rate strongly depends on the experimental parameters and may be significantly enhanced by increasing the positron-detector acceptance cone.

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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