Event-by-event fluctuations of particle ratios in central Pb+Pb collisions at 20-158 A GeV

被引：45
|
作者：
Roland, C [1 ]
机构：
[1] MIT, Cambridge, MA 02139 USA
来源：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2004年 / 30卷 / 08期
关键词：
D O I：
10.1088/0954-3899/30/8/132
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
In the vicinity of the QCD phase transition, critical fluctuations have been predicted to lead to non-statistical fluctuations of particle ratios, depending on the nature of the phase transition. Recent results of the NA49 energy scan programme show a sharp maximum of the ratio of K+ to pi(+) yields in central Pb+Pb collisions at beam energies of 20-30 A GeV. This observation has been interpreted as an indication of a phase transition at low SPS energies. We present first results on event-by-event fluctuations of the kaon to pion and proton to pion ratios at beam energies close to this maximum.
引用
收藏
页码：S1381 / S1384
页数：4
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