【摘要】 在能量为s =5 5TeV的LHCPb Pb重离子碰撞实验中 ,研究了和手征相变相关的π弦的可观测效应 .利用Kibble Zurek机制讨论了π弦的产生和演化 .在LHCPb Pb重离子碰撞实验中 ,如果手征相变发生并且是二级相变 ,那么π弦将会产生然后衰变 .π弦的主要效应是 :π弦衰变成大量的末态π粒子 ,这些大量的π粒子 ,主要分布在动量为 14 3MeV的低动量空间 ;同时π弦的衰变还伴随着大量中性π粒子 ,这些中性的π粒子主要分布在动量为 2 1MeV的低动量空间 .更多还原

【Abstract】 We study the possible signals of the pion string associated with the QCD chiral phase transition in LHC Pb-Pb collision at energy s=5.5 TeV. We follow the Kibble-Zurek mechanism to discuss the production and evolution of the pion string. We will show that if the QCD chiral phase transition really takes place in the LHC Pb-Pb collision process and the phase transition is in the second order, the pion string will be inevitably produced and subsequently decay. The main effect of this phenomenon is that there is a generation of a large number of pions in the final state produced by the decay of the pion string, and these pions are mostly distributed in a low momentum region with p～143MeV; also there are lots of neutral pions distributed in a low momentum region with the mean momentum at p～21MeV.更多还原