arXiv 1506.078842015-06nucl-exhep-ex

$\sqrt{s_{\rm {NN}}}$ =2.76 TeV时Pb-Pb碰撞中的一维π介子、K介子和质子飞秒观测

One-dimensional pion, kaon, and proton femtoscopy in Pb-Pb collisions at $\sqrt{s_{\rm {NN}}}$ =2.76 TeV

ALICE Collaboration

备注：: 24 pages, 9 captioned figures, 2 tables, authors from page 19, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1683
发表信息：: Phys. Rev. C 92 (2015) 054908
DOI：: 10.1103/PhysRevC.92.054908

摘要：

利用低相对动量粒子对的飞秒关联可以推知高能碰撞中粒子发射区的大小。这种相关性是由于量子统计和库仑以及强末态相互作用而产生的。本文介绍了LHC ALICE实验对$\sqrt{s_{\mathrm {NN}}}=2.76$ TeV的Pb-Pb碰撞的$π^{\pm}π^{\pm}$、${\rm K}^{\pm}{\rm K}^{\pm}$、${\rm K}^{0}_S{\rm K}^{0}_S$、${\rm pp}$和${\rm \overline{p}}{\rm \overline{p}}$关联的飞秒分析结果。从关联函数中提取了系统的一维半径，该半径是根据系统对的不变动量差确定的。从流体动力学模型的预测的测量半径的比较进行了讨论。π介子和K介子源半径随平均对横质量$m_{\rm T}$的增加而单调减小，这与流体动力学模型对中心碰撞的预测一致。用近似的$m_{\rm T}$标度可以合理地描述K介子和质子源的大小。

英文摘要：

The size of the particle emission region in high-energy collisions can be deduced using the femtoscopic correlations of particle pairs at low relative momentum. Such correlations arise due to quantum statistics and Coulomb and strong final state interactions. In this paper, results are presented from femtoscopic analyses of $π^{\pm}π^{\pm}$, ${\rm K}^{\pm}{\rm K}^{\pm}$, ${\rm K}^{0}_S{\rm K}^{0}_S$, ${\rm pp}$, and ${\rm \overline{p}}{\rm \overline{p}}$ correlations from Pb-Pb collisions at $\sqrt{s_{\mathrm {NN}}}=2.76$ TeV by the ALICE experiment at the LHC. One-dimensional radii of the system are extracted from correlation functions in terms of the invariant momentum difference of the pair. The comparison of the measured radii with the predictions from a hydrokinetic model is discussed. The pion and kaon source radii display a monotonic decrease with increasing average pair transverse mass $m_{\rm T}$ which is consistent with hydrodynamic model predictions for central collisions. The kaon and proton source sizes can be reasonably described by approximate $m_{\rm T}$-scaling.

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摘要：

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