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arXiv 2111.03401nucl-thhep-ph
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质子-核碰撞中的胶子交换模型

The Gluon Exchange Model in proton-nucleus collisions

Marek Jeżabek, Andrzej Rybicki

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15 pages, 4 figures
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摘要：

本文将我们最近提出的胶子交换模型（GEM）应用于N>1质子-核子碰撞的质子-核反应中的重子产生。我们提出了一个描述方案的软色八重态（胶子）交换的过程中，假设形成一个有效的双夸克的概率是相等的所有允许的夸克对。后者的有效双夸克可以由二价、一价和一个海夸克形成，也可以由两个海夸克形成。因此，我们计算了不同的颜色配置涉及价价，价海和海海型双夸克的概率。这些概率似乎取决于交换的胶子的数量，这导致增加重子停止作为核中质子-核子碰撞数量的函数。因此，原子核的阻止本领似乎是由新的颜色组态的出现作为N的函数，而不是由原来的价双夸克的能量损失。我们的方法的优势在于其高预测能力，这使得它可以通过CERN SPS的质子和中子生产的新的精确数据进行验证。后者的验证，和一组预测的N-依赖的重子停止过程，包括在信中。

英文摘要：

We apply our recently formulated Gluon Exchange Model (GEM) to baryon production in proton-nucleus reactions involving N>1 proton-nucleon collisions. We propose a description scheme for the process of soft color octet (gluon) exchange, based on the assumption that probabilities to form an effective diquark are equal for all allowed pairs of quarks. The latter effective diquark can form either from two valence, one valence and one sea, or from two sea quarks. Consequently we calculate the probabilities for different color configurations involving diquarks of valence-valence, valence-sea and sea-sea type. These probabilities appear to depend on the number of exchanged gluons, which results in increasing baryon stopping as a function of the number of proton-nucleon collisions in the nucleus. As such, the nuclear stopping power appears to be governed by the emergence of new color configurations as a function of N rather than by the energy loss of the original valence diquark. The advantage of our approach lies in its high predictive power which makes it verifiable by the new, precise data on proton and neutron production from the CERN SPS. The latter verification, and a set of predictions for the N-dependence of the baryon stopping process, are included in the letter.

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