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arXiv 0710.1787hep-ph
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核-核和电子-核碰撞中虚Delbrueck散射对相对论核光子发射的大贡献

Large contribution of virtual Delbrueck scattering to the emission of photons by relativistic nuclei in nucleus-nucleus and electron-nucleus collisions

I. F. Ginzburg, U. D. Jentschura, V. G. Serbo

摘要:

德尔布鲁克散射是光子在核的库仑场中通过虚电子环的弹性散射。本文讨论了在超相对论核Z_1Z_2-> Z_1Z_2 γ碰撞中,这个虚子过程对光子发射的贡献。我们确定传入的虚光子是由参与二元碰撞的相对论性原子核之一产生的,而散射光子是在这个过程中发射的。计算了光子的能量分布和角分布。所讨论的过程没有红外发散。在RHIC对撞机上得到的Au-Au碰撞的总截面为14 barn,在LHC对撞机上得到的Pb-Pb碰撞的总截面为50 barn。在所考虑的光子能量范围m_e << E_γ<< m_e γ(γ是原子核的洛伦兹因子)内,这些截面比普通的树能级核韧致辐射的截面大得多。最后,在eRHIC选项的上下文中讨论了电子-核碰撞eZ-> eZ γ中的光子发射。

英文摘要:

Delbrueck scattering is an elastic scattering of a photon in the Coulomb field of a nucleus via a virtual electron loop. The contribution of this virtual subprocess to the emission of a photon in the collision of ultra-relativistic nuclei Z_1 Z_2 -> Z_1 Z_2 gamma is considered. We identify the incoming virtual photon as being generated by one of the relativistic nuclei involved in the binary collision and the scattered photon as being emitted in the process. The energy and angular distributions of the photons are calculated. The discussed process has no infrared divergence. The total cross section obtained is 14 barn for Au-Au collisions at the RHIC collider and 50 barn for Pb-Pb collisions at the LHC collider. These cross sections are considerably larger than those for ordinary tree-level nuclear bremsstrahlung in the considered photon energy range m_e << E_γ<< m_e gamma, where gamma is the Lorentz factor of the nucleus. Finally, photon emission in electron-nucleus collisions e Z -> e Z gamma is discussed in the context of the eRHIC option.

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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