期刊
PHYSICAL REVIEW C
卷 81, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.81.064907
关键词
-
资金
- US Department of Energy [DE-FG03-97ER41020/A000]
- Bundesministerium fur Bildung und Forschung, Germany [06F137]
- Virtual Institute VI-146 of Helmholtz Gemeinschaft, Germany
- Polish State Committee for Scientific Research [1 P03B 006 30, 1 P03B 097 29, 1 PO3B 121 29, 1 P03B 127 30]
- Hungarian Scientific Research Foundation [T032648, T032293, T043514]
- Hungarian National Science Foundation
- OTKA [F034707]
- Polish-German Foundation
- Bulgarian National Science Fund [Ph-09/05]
- Croatian Ministry of Science, Education, and Sport [0980982887-2878]
- Stichting FOM, the Netherlands
- EPEAEK II (European Union and the Greek Ministry of Education)
- University of Athens
Pion production in nuclear collisions at the Super Proton Synchrotron (SPS) is investigated with the aim to search, in a restricted domain of the phase diagram, for power laws in the behavior of correlations that are compatible with critical QCD. We analyzed interactions of nuclei of different sizes (p + p, C + C, Si + Si, Pb + Pb) at 158A GeV adopting, as appropriate observables, scaled factorial moments in a search for intermittent fluctuations in transverse dimensions. The analysis is performed for pi+pi(-) pairs with an invariant mass very close to the two-pion threshold. In this sector one may capture critical fluctuations of the sigma component in a hadronic medium, even if the sigma meson has no well-defined vacuum state. It turns out that for the Pb + Pb system the proposed analysis technique cannot be applied without entering the invariant mass region with strong Coulomb correlations. As a result the treatment becomes inconclusive in this case. Our results for the other systems indicate the presence of power-law fluctuations in the freeze-out state of Si + Si approaching in size the prediction of critical QCD.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据