标题： 在 $p$$+$$p$ 能量为 $\sqrt{s_{_{NN}}}=200$ GeV 的碰撞中测量包含喷流的横截面和亚结构 显示英文标题

标题： Measurement of inclusive jet cross section and substructure in $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV

摘要： 在相对论重离子对撞机（RHIC）上，PHENIX合作组测量了 $p$$+$$p$ 能量为 $\sqrt{s}=200$ GeV时的喷注横截面和喷注亚结构可观测量。 喷注由带电粒子轨迹和电磁量能器簇使用反$k_{t}$算法重构，喷注半径为$R=0.3$，适用于横动量在$8.0<p_T<40.0$GeV/$c$范围内且伪快度为$|\eta|<0.15$的喷注。 测量内容包括喷注横截面，以及 SoftDrop 修整后的动量分数（$z_g$）、相对于喷注轴的带电粒子横向动量（$j_T$）和喷注内带电粒子径向分布（$r$）。还测量了$\xi=-ln(z)$的分布，其中$z$是喷注动量由带电粒子携带的比例。这些测量结果与理论上的次领头阶和次次领头阶计算、PYTHIA 事件生成器以及其他现有的实验结果进行了比较。结果显示，在相对论重离子对撞机（RHIC）能量下的喷注粒子多重性低于模型预测值。此外，还指出了这些测量对未来在 RHIC 的 sPHENIX 实验以及未来电子-离子对撞机上的喷注测量的启示。 显示英文摘要

摘要： The jet cross-section and jet-substructure observables in $p$$+$$p$ collisions at $\sqrt{s}=200$ GeV were measured by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC). Jets are reconstructed from charged-particle tracks and electromagnetic-calorimeter clusters using the anti-$k_{t}$ algorithm with a jet radius $R=0.3$ for jets with transverse momentum within $8.0<p_T<40.0$ GeV/$c$ and pseudorapidity $|\eta|<0.15$. Measurements include the jet cross section, as well as distributions of SoftDrop-groomed momentum fraction ($z_g$), charged-particle transverse momentum with respect to jet axis ($j_T$), and radial distributions of charged particles within jets ($r$). Also meaureed was the distribution of $\xi=-ln(z)$, where $z$ is the fraction of the jet momentum carried by the charged particle. The measurements are compared to theoretical next-to and next-to-next-to-leading-order calculatios, PYTHIA event generator, and to other existing experimental results. Indicated from these meaurements is a lower particle multiplicity in jets at RHIC energies when compared to models. Also noted are implications for future jet measurements with sPHENIX at RHIC as well as at the future Electron-Ion Collider.