论文标题
$ \ sqrt {s} = 13 $ tev，PP冲突中带电粒子喷气的多样性依赖性
Multiplicity dependence of charged-particle jet production in pp collisions at $\sqrt{s} = 13$ TeV
论文作者
论文摘要
首次研究了$ \ sqrt {s} = 13 \ \ mathrm {tev} $在pp碰撞中喷气产生的多重性依赖性。使用抗$ k_ \ mathrm {t} $算法从带电的粒子重建喷气机，其分辨率参数$ r $从$ 0.2 $到$ 0.7 $。喷气机以假性范围$ |η_ {\ rm jet} | <0.9-r $和横向动量范围$ 5 <p_ \ p_ \ mathrm {t，jet}^{\ rm ch} <140 \ \ \ \ \ \ \ \ \ \ \ \ m mathrm {gev}/c $。多重性间隔由爱丽丝远期检测器V0分类。将带电粒子喷气机的$ p _ {\ mathrm {t}} $差分横截面与领先顺序（LO）和近代领先顺序（NLO）扰动量子量子染色体动力学（PQCD）计算进行了比较。发现数据通过NLO计算更好地描述了数据，尽管NLO预测高估了低于$ 20 \\ Mathrm {gev}/c $的JET横截面。还测量了不同$ R $的横截面比率，并将其与模型计算进行了比较。这些测量提供了对射流碎片的角度依赖性的见解。射流产率随着增加的自相应带电粒子多重性而增加。这种增加仅显示出对射流横向动量和分辨率参数的弱依赖性。虽然当前版本的毕曲亚（Pythia）定性地描述了这种行为，但定量描述可能需要实施新机制，以在HADRONIC碰撞中实施多粒子生产。
The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy of $\sqrt{s} = 13\ \mathrm{TeV}$ is studied for the first time. Jets are reconstructed from charged particles using the anti-$k_\mathrm{T}$ algorithm with resolution parameters $R$ varying from $0.2$ to $0.7$. The jets are measured in the pseudorapidity range $|η_{\rm jet}|< 0.9-R$ and in the transverse momentum range $5<p_\mathrm{T,jet}^{\rm ch}<140\ \mathrm{GeV}/c$. The multiplicity intervals are categorised by the ALICE forward detector V0. The $p_{\mathrm{T}}$ differential cross section of charged-particle jets are compared to leading order (LO) and next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the data are better described by the NLO calculation, although the NLO prediction overestimates the jet cross section below $20\ \mathrm{GeV}/c$. The cross section ratios for different $R$ are also measured and compared to model calculations. These measurements provide insights into the angular dependence of jet fragmentation. The jet yield increases with increasing self-normalised charged-particle multiplicity. This increase shows only a weak dependence on jet transverse momentum and resolution parameter at the highest multiplicity. While such behaviour is qualitatively described by the present version of PYTHIA, quantitative description may require implementing new mechanisms for multi-particle production in hadronic collisions.
