论文标题
PP碰撞中带有横向动量阈值的带电粒子的假性密度在$ \ sqrt {s} = 5.02 $和$ 13 $ TEV
Pseudorapidity densities of charged particles with transverse momentum thresholds in pp collisions at $\sqrt{s} = 5.02$ and $13$ TeV
论文作者
论文摘要
具有最小横向动量（$ p _ {\ rm t} $）的带电颗粒的假性密度为0.15、0.5、1和2 GEV $/c $的阈值，在PP碰撞中测量了$ \ sqrt {s}} = $ 5.02和13 TECTER的PP碰撞中的PP碰撞。这项研究是针对非弹性碰撞进行的，至少一个主电荷粒子在$ \ pm0.8 $和$ p _ {\ rm t} $之内，其伪造性（$η$）比相应的阈值大。此外，在没有$ p _ {\ rm t} $的情况下进行测量 - 对于非弹性和非单个效法事件以及对无弹性事件的阈值，至少有一个带电的粒子在$ \ s} = $ 5.02 = $ 5.02 tev的pp碰撞中，至少有一个带电的粒子|最for $ |最for pp碰撞。将这些测量值与毕达6，毕曲霉8和EPOS-LHC模型进行比较。通常，模型很好地描述了粒子生产的$η$依赖性。但是，对于最高的横向动量阈值（$ p _ {\ rm t}> 2 {\ rm \ gev}/c $），观察到差异，强调了此类测量对于调谐事件生成器的重要性。在不确定性中，新的测量结果与以$ \ sqrt {s} = 13 $ TEV获得的ATLA和CMS实验的结果一致。
The pseudorapidity density of charged particles with minimum transverse momentum ($p_{\rm T}$) thresholds of 0.15, 0.5, 1, and 2 GeV$/c$ is measured in pp collisions at the centre of mass energies of $\sqrt{s} =$ 5.02 and 13 TeV with the ALICE detector. The study is carried out for inelastic collisions with at least one primary charged particle having a pseudorapidity ($η$) within $\pm0.8$ and $p_{\rm T}$ larger than the corresponding threshold. In addition, measurements without $p_{\rm T}$-thresholds are performed for inelastic and non-single-diffractive events as well as for inelastic events with at least one charged particle having $|η|<1$ in pp collisions at $\sqrt{s} =$ 5.02 TeV for the first time at the LHC. These measurements are compared to the PYTHIA 6, PYTHIA 8, and EPOS-LHC models. In general, the models describe the $η$ dependence of particle production well. However, discrepancies are observed for the highest transverse momentum threshold ($p_{\rm T}>2 {\rm\ GeV}/c$), highlighting the importance of such measurements for tuning event generators. The new measurements agree within uncertainties with results from the ATLAS and CMS experiments obtained at $\sqrt{s} = 13$ TeV.
