通过夸克-胶子等离子体的HBT关联的Y1秒计量
Yoctosecond metrology through HBT correlations from a quark-gluon plasma
摘要：
重离子碰撞中产生的夸克-胶子等离子体（QGP）的演化受微秒级膨胀动力学的影响。我们展示了如何通过Hanbury Brown和Twiss（HBT）强度干涉测量从QGP内部发射的直接光子来获得这些动力学。靠近束轴放置的探测器对QGP的早期极动量各向异性特别敏感。在LHC ALICE实验的FoCal探测器上观察HBT信号的变化将允许测量等离子体的各向同性时间，并可以提供在微秒时间尺度上的光子双脉冲的第一个实验证据。
英文摘要：
Expansion dynamics at the yoctosecond timescale affect the evolution of the quark gluon plasma (QGP) created in heavy ion collisions. We show how these dynamics are accessible through Hanbury Brown and Twiss (HBT) intensity interferometry of direct photons emitted from the interior of the QGP. A detector placed close to the beam axis is particularly sensitive to early polar momentum anisotropies of the QGP. Observing a modification of the HBT signal at the proposed FoCal detector of the LHC ALICE experiment would allow to measure the isotropization time of the plasma and could provide first experimental evidence for photon double pulses at the yoctosecond timescale.
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