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arXiv 1502.00559nucl-ex
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$\sqrt{s_{\rm NN}}=5.02$ TeV p-Pb碰撞中的双π飞秒观测

Two-pion femtoscopy in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

ALICE Collaboration

摘要:

我们报道了在$\sqrt{s_{\mathrm{NN}}}=5.02$ TeV的p-Pb碰撞中测量的全同π介子对的飞秒分析结果。飞秒半径被确定为事件的多重性和对在三个空间维度的动量的函数。在pp碰撞系统中,除了飞秒信号之外,还存在相当大的背景相关结构,这使得分析变得复杂。半径随事件多重数的增加而增加,随对横动量的增加而减小。当采取可比的多重数,在p-Pb碰撞中测量的半径,在高多重数和低对横动量,是10-20%,高于在pp碰撞中观察到的,但低于在A-A碰撞中观察到的。结果进行了比较,流体动力学预测在大事件的多重性,以及讨论的背景下,计算的基础上胶子饱和。

英文摘要:

We report the results of the femtoscopic analysis of pairs of identical pions measured in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Femtoscopic radii are determined as a function of event multiplicity and pair momentum in three spatial dimensions. As in the pp collision system, the analysis is complicated by the presence of sizable background correlation structures in addition to the femtoscopic signal. The radii increase with event multiplicity and decrease with pair transverse momentum. When taken at comparable multiplicity, the radii measured in p-Pb collisions, at high multiplicity and low pair transverse momentum, are 10-20% higher than those observed in pp collisions but below those observed in A-A collisions. The results are compared to hydrodynamic predictions at large event multiplicity as well as discussed in the context of calculations based on gluon saturation.

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