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arXiv 1208.0448hep-phnucl-th
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LHC能重离子碰撞中的反常重子产生

Anomalous baryon production in heavy ion collisions at LHC energies

Dániel Berényi, Attila Pásztor, Vladimir Skokov, Péter Lévai

摘要:

在超相对论性重离子碰撞中,中高横动量区的重子介子比还没有被完全理解。虽然夸克聚结方法结合喷流碎裂产生的结果接近实验数据,一些趋势没有重现,需要进一步研究。我们提出了一个新的通道,即从重离子碰撞早期产生的相干胶子场产生额外的夸克-反夸克和双夸克-反双夸克对。这个过程是定量描述的时间依赖的Schwinger机制。额外的双夸克-夸克合并产额能够解释测量到的异常重子产生。

英文摘要:

In ultrarelativistic heavy ion collisions the baryon-meson ratio is not fully understood in the intermediate-to-high transverse momentum region. Although quark coalescence methods combined with jet fragmentation yield results close to the experimental data, some tendencies are not reproduced and require further investigation. We propose a new channel, namely extra quark-antiquark and diquark-antidiquark pair production from coherent gluon field created in the early stage of heavy ion collisions. This process is described quantitatively by the time-dependent Schwinger-mechanism. The extra diquark-quark coalescence yields are able to explain the measured anomalous baryon production.

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