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arXiv 2206.03411hep-phhep-ex
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张量-坡密子方法中高能质子-质子碰撞中的软光子辐射:韧致辐射

Soft-photon radiation in high-energy proton-proton collisions within the tensor-Pomeron approach: Bremsstrahlung

Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek

摘要:

本文讨论了质子-质子碰撞中的衍射过程。我们考虑软排斥反应$pp \to pp$,$p\bar{p} \to p\bar{p}$,和$pp \to pp γ$内的张量pomeron和矢量odderon的方法。我们比较我们的结果与数据$pp$和$p\bar{p}$总截面,前向散射振幅的实虚部的比率,和弹性$pp$截面,特别是那些从TOTEM。为了更准确地描述低能数据,必须包括次级reggeons。利用张量-坡密子模型,给出了高能质子-质子碰撞中光子韧致辐射的振幅。这些结果与C.M.目前在相对论重离子对撞机和大型强子对撞机可用的能量。我们提出的软光子的测量与计划在LHC的ALICE实验的未来升级的预测。我们研究了基于Low定理的软光子近似(SPA)的适用性限制。相应的SPA结果进行比较,从我们的完整模型。定量地给出了SPA与我们的完全张量-坡密子结果接近的相空间区域。作为一个例子,令$k_{\perp}$、$\rm y$和$ω$分别为总cm中光子的横向动量、快度和能量的绝对值。系统对于区域$1 \; {\rm MeV} < k_{\perp} < 100 \; {\rm MeV}$和$3.5 < |\rm y| < 5.0$,我们发现仅具有极项的SPA Ansatz $\propto ω^{-1}$在百分比水平上与我们的完整模型结果一致,直至$ω\cong 2$ GeV。

英文摘要:

We discuss diffractive processes in proton-proton collisions at small momentum transfers without and with photon radiation. We consider the soft exclusive reactions $pp \to pp$, $p\bar{p} \to p\bar{p}$, and $pp \to pp γ$ within the tensor-pomeron and vector-odderon approach. We compare our results with the data for $pp$ and $p\bar{p}$ total cross sections, for the ratio of real to imaginary part of the forward scattering amplitude, and for the elastic $pp$ cross sections, especially those from TOTEM. To describe the low-energy data more accurately the secondary reggeons must be included. We write down the amplitudes for the photon bremsstrahlung in high-energy proton-proton collisions using the tensor-pomeron model. These results are relevant for the c.m. energies presently available at the Relativistic Heavy Ion Collider and at the LHC. We present predictions for the proposed measurements of soft photons with the planned future upgrade of the ALICE experiment at the LHC. We investigate the limits of applicability of the soft-photon approximation (SPA) based on Low's theorem. The corresponding SPA results are compared to those obtained from our complete model. The regions of phase space are given quantitatively where SPA and our complete tensor-pomeron results are close to each other. As an example, let $k_{\perp}$, $\rm y$, and $ω$, be the absolute value of the transverse momentum, the rapidity, and the energy of the photon, respectively, in the overall c.m. system. For the region $1 \; {\rm MeV} < k_{\perp} < 100 \; {\rm MeV}$ and $3.5 < |\rm y| < 5.0$, we find that the SPA Ansatz with only the pole terms $\propto ω^{-1}$ agrees at the percent level with our complete model result up to $ω\cong 2$ GeV.

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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