论文标题
$ \ varupsilon（\ textrm {ns}）$ Mesons in Pb+Pb和$ pp $ collisions at 5.02 TEV
Production of $\varUpsilon(\textrm{nS})$ mesons in Pb+Pb and $pp$ collisions at 5.02 TeV
论文作者
论文摘要
矢量底部状态的生产，$ \ varupsilon（\ textrm {1s}）$，$ \ varupsilon（\ varupsilon（\ textrm {2s}）$和$ \ varupsilon（\ varupsilon（\ \ varupsilon）（\ \ textrm {3S}）$，在pb+pb $ pp $ pp collisiation2中，提出。数据对应于1.38〜 $ \ textrm {nb}^{ - 1} $ pb+pb数据的集成发光度，0.44 $ \ textrm {nb}^{ - 1} $ pb+pb数据在2015年收集的pb+pb数据，以及0.26 $ \ textrm $ \ textrm pppp $ \ fb} 2017年由大型强子对撞机的地图集探测器制作。测量值是在Dimuon衰减通道中进行的，用于横向动量$ P_ \ TEXTRM {T}^{μμ} <30 $ 〜GEV，绝对快速速度$ | y^{μμμ} | <1.5 $，PB+PB事件中心性0-80％。将PB+PB碰撞中三个底部状态的生产率与$ PP $碰撞中的生产率进行比较，以提取核修饰因子作为事件中心性的功能，即$ p_ \ textrm {t}^{μμμ} $，以及$ | y^{μμμ} | $。另外，研究了相对于基态的激发态的抑制。将结果与理论模型计算进行比较。
A measurement of the production of vector bottomonium states, $\varUpsilon(\textrm{1S})$, $\varUpsilon(\textrm{2S})$, and $\varUpsilon(\textrm{3S})$, in Pb+Pb and $pp$ collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38~$\textrm{nb}^{-1}$ of Pb+Pb data collected in 2018, 0.44 $\textrm{nb}^{-1}$ of Pb+Pb data collected in 2015, and 0.26 $\textrm{fb}^{-1}$ of $pp$ data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum $p_\textrm{T}^{μμ} < 30$~ GeV, absolute rapidity $|y^{μμ}|<1.5$, and Pb+Pb event centrality 0-80%. The production rates of the three bottomonium states in Pb+Pb collisions are compared with those in $pp$ collisions to extract the nuclear modification factors as functions of event centrality, $p_\textrm{T}^{μμ}$, and $|y^{μμ}|$. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.
