论文标题
对$ψ\ rm {（2s）} $生产的核效应的测量在$ \ sqrt {\ textit {s} _ {\ rm nn}} = 8.16 $ tev
Measurement of nuclear effects on $ψ\rm{(2S)}$ production in p-Pb collisions at $\sqrt{\textit{s}_{\rm NN}} = 8.16$ TeV
论文作者
论文摘要
在p-pb碰撞中测量了包容性$ψ$（2s）的生产，该核能中心能量$ \ sqrt {s _ {\ rm {\ rm {nn}}} = 8.16 $ tev，使用cern LHC的爱丽丝探测器。 $ψ$（2s）的生产是在向前研究的（$ 2.03 <y _ {\ rm cms} <3.53 $）和向后研究（$ -4.46 <y _ _ {\ rm cms} <-2.96 $）cappartim of-ass of-ass快速和横向动量$ p _ { muon对。在本文中，我们报告了集成的以及$ y _ {\ rm cms} $ - 和$ p _ {\ rm t} $ - 差分包含性生产横截面。通过确定核修饰因子对$ψ$（2s）产生的核影响，该因子在质量和后质量迅速中都表现出强烈的抑制作用。与包含J/$ψ$相应结果的相应结果的比较显示了对向前速度的两个状态（p-todience）的相似抑制作用，但在向后速度（PB-toendient）上对$ψ$（2s）的抑制更强。作为$ p _ {\ rm t} $的函数，找不到核修饰因子的明确依赖性。还通过生产横截面$ [σ_{ψ（2s）}/σ_{\ rm {j/}ψ} _ {\ rm rmMMMMMMMMM [σ_{ψ（2s）}] _ { ppb}/[σ_{ψ（2s）}/σ_{\ rm {\ rm {j/}ψ}] _ {\ rm pp} $之间的p-pb和pp碰撞。将结果与理论模型进行了比较，这些模型包括与碰撞系统的初始和最终状态有关的各种效果，以及以前的测量值$ \ sqrt {s _ {\ rm {nn}}} $ = 5.02 tev。
Inclusive $ψ$(2S) production is measured in p-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair $\sqrt{s_{\rm{NN}}}=8.16$ TeV, using the ALICE detector at the CERN LHC. The production of $ψ$(2S) is studied at forward ($2.03 < y_{\rm cms} < 3.53$) and backward ($-4.46 < y_{\rm cms} < -2.96$) centre-of-mass rapidity and for transverse momentum $p_{\rm{T}}$ $<$ 12 GeV/$c$ via the decay to muon pairs. In this paper, we report the integrated as well as the $y_{\rm cms}$- and $p_{\rm T}$-differential inclusive production cross sections. Nuclear effects on $ψ$(2S) production are studied via the determination of the nuclear modification factor that shows a strong suppression at both forward and backward centre-of-mass rapidities. Comparisons with corresponding results for inclusive J/$ψ$ show a similar suppression for the two states at forward rapidity (p-going direction), but a stronger suppression for $ψ$(2S) at backward rapidity (Pb-going direction). As a function of $p_{\rm T}$, no clear dependence of the nuclear modification factor is found. The relative size of nuclear effects on $ψ$(2S) production compared to J/$ψ$ is also studied via the double ratio of production cross sections $[σ_{ψ(2S)}/σ_{\rm{J/}ψ}]_{\rm pPb}/[σ_{ψ(2S)}/σ_{\rm{J/}ψ}]_{\rm pp}$ between p-Pb and pp collisions. The results are compared with theoretical models that include various effects related to the initial and final state of the collision system and also with previous measurements at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV.
