Freeze-out radii extracted from three-pion cumulants in pp, p-Pb and Pb-Pb collisions at the LHC
Freeze-out radii extracted from three-pion cumulants in pp, p-Pb and Pb-Pb collisions at the LHC
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DOI：
10.1016/j.physletb.2014.10.034
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发表时间：
2014-12-12
影响因子：
4.4
通讯作者：
Zyzak, M.
中科院分区：
文献类型：
--
作者：
Abelev, B.;Adam, J.;Zyzak, M.
在高能碰撞中，粒子产生区域的时空大小可以使用低相对动量下相同玻色子的玻色-爱因斯坦相关性来测量。源半径通常使用二π介子相关性来提取，并在相互作用的最后阶段（称为动力学冻结）表征系统。在低多重性碰撞中，与高多重性碰撞不同，二π介子相关性会被背景相关性显着改变，例如。 g。迷你喷气式飞机。这种相关性可以使用三π累积量相关性来抑制。我们首次测量了冻结时系统的尺寸，该测量值是从 LHC 与 ALICE 的 pp、p-Pb 和 Pb-Pb 碰撞中的三π介子累积量相关性中提取的。在相似的多重性下，p-Pb 碰撞中提取的不变半径比 pp 中的大 5-15%，而 Pb-Pb 中的不变半径比 p-Pb 中的大 35-55%。我们的测量结果不支持这样的模型：与类似多重性的 pp 碰撞相比，p-Pb 中的集体膨胀要强得多。 (C) 2014 年作者。由 Elsevier B.V 出版。这是一篇 CC BY 许可下的开放获取文章
In high-energy collisions, the spatio-temporal size of the particle production region can be measured using the Bose-Einstein correlations of identical bosons at low relative momentum. The source radii are typically extracted using two-pion correlations, and characterize the system at the last stage of interaction, called kinetic freeze-out. In low-multiplicity collisions, unlike in high-multiplicity collisions, two-pion correlations are substantially altered by background correlations, e. g. mini-jets. Such correlations can be suppressed using three-pion cumulant correlations. We present the first measurements of the size of the system at freeze-out extracted from three-pion cumulant correlations in pp, p-Pb and Pb-Pb collisions at the LHC with ALICE. At similar multiplicity, the invariant radii extracted in p-Pb collisions are found to be 5-15% larger than those in pp, while those in Pb-Pb are 35-55% larger than those in p-Pb. Our measurements disfavor models which incorporate substantially stronger collective expansion in p-Pb as compared to pp collisions at similar multiplicity. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license