LHC p-p碰撞中集体流和透明性的指示
Indication of Collective Flow and Transparency in p-p Collisions at LHC
摘要：
用统一的统计热冻结模型研究了LHC能量root（snn）= 0.9TeV和root（snn）= 7.0TeV的p-p碰撞中强子的中快度横动量谱和奇异强子的有效快度分布。计算结果与实验数据吻合较好。利用模型计算得到的横动量谱的理论拟合，提供了不同强子种的温度和集体流参数的热冻结条件。研究揭示了存在显着的集体流动和一个明确的温度在系统中，从而表明在LHC的p-p碰撞热平衡的流体动力学系统的形成。此外，对已有的奇异强子快度分布实验数据的拟合表明，在LHC的p-p碰撞中几乎是完全透明的。还成功地再现了root（snn）= 200 GeV和root（snn）= 2.76 TeV的p-p碰撞中产生的质子和K介子的横动量分布。该模型结合了纵向以及横向流体动力学流。较重的衰变共振的贡献也被考虑在内。我们还在系统中施加了精确奇异性守恒的准则。
英文摘要：
The mid-rapidity transverse momentum spectra of hadrons and the available rapidity distributions of the strange hadrons produced in p-p collisions at LHC energy root(snn) = 0.9 TeV and root(snn)= 7.0 TeV have been studied using a unified statistical thermal freeze-out model. The calculated results are found to be in good agreement with the experimental data. The theoretical fits of the transverse momentum spectra using the model calculations provide the thermal freeze-out conditions in terms of the temperature and collective flow parameters for different hadronic species. The study reveal the presence of significant collective flow and a well defined temperature in the system thus indicating the formation of a thermally equilibrated hydrodynamic system in p-p collisions at LHC. Moreover, the fits to the available experimental rapidity distributions data of strange hadrons show the effect of almost complete transparency in p-p collisions at LHC. The transverse momentum distributions of protons and Kaons produced in p-p collisions at root(snn) = 200 GeV and root(snn)= 2.76 TeV have also been reproduced successfully. The model incorporates longitudinal as well as a transverse hydrodynamic flow. The contributions from heavier decay resonances have also been taken into account. We have also imposed the criteria of exact strangeness conservation in the system.
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