论文标题
QCD喷气机中的Lund多重性
Lund multiplicity in QCD jets
论文作者
论文摘要
我们计算高能QCD喷气机的平均隆德多样性。这将较早的计算扩展到$ e^+e^ - $ collisions [arxiv：2205.02861]中的事件全次多重性，以便在LHC上可用的较大能量范围。我们的计算实现了临时到达双对数（NNDL）精度。我们的结果分为通用的共线作品，这是$ e^+e^ - $计算和非宇宙大角度贡献的常见。后者占总多重性的10-15％。我们通过将重新定义的计算与固定排正常的NLO结果相匹配，并通过蒙特卡洛模拟进行非扰动校正来提供准确的LHC预测。包括NNDL项（包括NNDL项）导致理论不确定性的50％降低，而非扰动校正量保持在5％以下，低于几个GEV的横向动量尺度。这证明了LUND多重性在LHC上进行健壮的理论到数据比较的适用性。
We compute the average Lund multiplicity of high-energy QCD jets. This extends an earlier calculation, done for event-wide multiplicity in $e^+e^-$ collisions [arxiv:2205.02861], to the large energy range available at the LHC. Our calculation achieves next-to-next-to-double logarithmic (NNDL) accuracy. Our results are split into a universal collinear piece, common to the $e^+e^-$ calculation, and a non-universal large-angle contribution. The latter amounts to 10-15% of the total multiplicity. We provide accurate LHC predictions by matching our resummed calculation to fixed-order NLO results and by incorporating non-perturbative corrections via Monte Carlo simulations. Including NNDL terms leads to a 50% reduction of the theoretical uncertainty, with non-perturbative corrections remaining below 5% down to transverse momentum scales of a few GeV. This proves the suitability of Lund multiplicities for robust theory-to-data comparisons at the LHC.
