论文标题
$ \ PB碰撞的$ \ Mathbf {\ sqrt {\ textIt {s} _ {\ textbf {nn}} = 5.02} $ TEV
$Υ$ production and nuclear modification at forward rapidity in Pb-Pb collisions at $\mathbf{\sqrt{\textit{s}_{\textbf{NN}}}=5.02}$ TeV
论文作者
论文摘要
PB-PB碰撞中的$υ$ Meson在每个核子对$ \ sqrt {s _ {\ rm nn}} $ = 5 TEV中的生产。收益率和核修饰因子在远期快速区域中确定$ 2.5 <y <4.0 $，这是速度，横向动量和碰撞中心性的函数。结果表明，相对于质子 - 普罗顿碰撞的产量，$υ$（1s）介子的产量被抑制了大约三倍。第一次，在正向速度上观察到$υ$（2s）的明显信号，表明相对于基态，抑制更强大约2-3。将测量结果与运输，流体动力，COMOVE和统计强调模型计算进行比较。
The production of $Υ$ mesons in Pb-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5 TeV is measured with the muon spectrometer of the ALICE detector at the LHC. The yields as well as the nuclear modification factors are determined in the forward rapidity region $2.5<y<4.0$, as a function of rapidity, transverse momentum and collision centrality. The results show that the production of the $Υ$(1S) meson is suppressed by a factor of about three with respect to the production in proton-proton collisions. For the first time, a significant signal for the $Υ$(2S) meson is observed at forward rapidity, indicating a suppression stronger by about a factor 2-3 with respect to the ground state. The measurements are compared with transport, hydrodynamic, comover and statistical hadronisation model calculations.
