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利用文献 [1]的衍射几何模型解释了HERA光生衍射反应过程γP→XP的截面σ与质心系能量W的相关性 :σ∝Wσ 相似文献
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In the paper we discuss the role of the axial U(1)A symmetry in the chiral phase transition using the U(Nf)R × U(Nf)L linear sigma model with two massless quark flavors. It is expected that above a certain temperature the axial U(1)A symmetry will be restored. A string-like static solution, the η string can be formed and detected in the ultrarelativistic heavy-ion collision process. 相似文献
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设计了一个物质磁化的演示实验装置 ,演示了物质在磁场中的磁化现象 ,并通过测量物质在磁场内外的质量差计算磁化率 相似文献
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讨论了在LHC的Pb-Pb碰撞过程中,如果QGP SU(2)手征相变出现二级相变,那么系统将会有π弦产生,并且π弦最终将衰变为π介子。于是以上效应将导致在低动量区域(p~150—400 MeV)内的π介子增强。对应于不同的冷却温度Tf=130,120,110 MeV,产生于π弦衰变的π介子的数量分别是Nt≈270,150, 60. It is pointed out that if the QGP SU(2) chiral phase transition in the LHC Pb Pb collision process is taken place and the phase transition is in the second order, then pion strings will be formed, and decay. These phenomena lead to the pion enhancement in the low momentum region(p150—400 MeV) and the number of pions produced from pion string decay can be estimated about Nt≈270, 150, 60 for different freeze temperature Tf=130, 120, 110 MeV respectively. 相似文献
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