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arXiv 1910.04799hep-ph
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用库仑核干涉探测Pomeron自旋翻转

Probing the Pomeron spin-flip with Coulomb-nuclear interference

B. Z. Kopeliovich, M. Krelina

摘要:

BNL的固定目标实验HJET在$E_{lab}=100$和$255 \mbox{ GeV}$的小角度弹性$pp$散射中的单自旋不对称性$A_N(t)$的全新高精度数据,以及$\sqrt{s}=200 \mbox{ GeV}$的高能STAR测量,首次允许确定宽能量范围内的自旋翻转与非翻转比$r_5(t)$。我们介绍了库仑核干扰(CNI)机制,错过了以前的分析中的一个重要的修改。它既可以表述为库仑相位的修正,自旋翻转时的库仑相位比非翻转时的库仑相位大得多,也可以表述为强子电磁相互作用的吸收修正。Regge分析指出了Pomeron对自旋翻转振幅的贡献,自旋翻转振幅随能量急剧上升。我们发现,自旋翻转非翻转比例的Pomeron振幅接近$-10\%$,急剧上升的能量与理论预期一致。

英文摘要:

Brand-new high-precision data for single-spin asymmetry $A_N(t)$ in small angle elastic $pp$ scattering from the fixed target experiment HJET at BNL at $E_{lab}=100$ and $255 \mbox{ GeV}$, as well as high energy STAR measurements at $\sqrt{s}=200 \mbox{ GeV}$, for the first time allowed to determine the spin-flip to non-flip ratio $r_5(t)$ in a wide energy range. We introduced an essential modification in the Coulomb-nuclear interference (CNI) mechanism, missed in previous analyses. It can be formulated either as a modification of the Coulomb phase, which is much larger for the spin-flip compared with non-flip amplitudes, or as absorptive corrections to the electromagnetic interaction of hadrons. The Regge analysis singles out the Pomeron contribution to the spin-flip amplitude, which steeply rises with energy. We found the spin-flip to non-flip ratio of the Pomeron amplitudes to be nearly $-10\%$, steeply rising with energy in accordance with theoretical expectations.

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