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Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at root s(NN)=2.76 TeV

机译:近侧喷射峰的纵向和方位角结构的演变在根S(NN)= 2.76 Tev的PB-PB碰撞中

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摘要

In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-p(T) trigger particle. Measurements of these correlations as a function of pseudorapidity (Delta eta) and azimuthal (Delta phi) differences are used to extract the centrality and p(T) dependence of the shape of the near-side peak in the p(T) range 1 < p(T) < 8 GeV/c in Pb-Pb and pp collisions at root s(NN) = 2.76 TeV. A combined fit of the near-side peak and long-range correlations is applied to the data and the peak shape is quantified by the variance of the distributions. While the width of the peak in the Delta phi direction is almost independent of centrality, a significant broadening in the Delta eta direction is found from peripheral to central collisions. This feature is prominent for the low-p(T) region and vanishes above 4 GeV/c. The widths measured in peripheral collisions are equal to those in pp collisions in the Delta phi direction and above 3 GeV/c in the Delta eta direction. Furthermore, for the 10% most central collisions and 1 < p(T, assoc) < 2 GeV/c, 1 < p(T,trig) < 3 GeV/c, a departure from a Gaussian shape is found: a depletion develops around the center of the peak. The results are compared to A Multi-Phase Transport (AMPT) model simulation as well as other theoretical calculations indicating that the broadening and the development of the depletion are connected to the strength of radial and longitudinal flow.
机译:在两个粒子角相关测量中,喷射产生近侧峰,由与高p(t)触发颗粒相关联的颗粒形成。这些相关性的测量与伪型(Delta ETA)和方位角(Delta phi)差的函数用于提取P(t)范围1中近侧峰的形状的中心性和p(t)依赖性。 PB-PB中的p(t)<8 gev / c在根S(nn)= 2.76 tev处的pp碰撞。近侧峰和远程相关的组合拟合应用于数据,并且通过分布的方差来量化峰值。虽然Delta PHI方向上峰的宽度几乎与中心体无关,但在ΔEta方向上的显着宽度从外围到中央碰撞。此功能对于低p(t)区域突出,并在4 gev / c以上消失。在ΔEta方向上以高于3 GEV / C,在外围碰撞中测量的宽度等于ΔTETA方向上的PP碰撞中的宽度。此外,对于10%的中央碰撞和1 (t,assoce)<2 gev / c,1 (t,trig)<3 gev / c,发现了从高斯形状的偏离:耗尽发育围绕峰的中心。结果将结果与多相传输(AMPT)模型模拟​​相比以及其他理论计算,表明耗尽的扩大和开发连接到径向和纵向流动的强度。

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