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High-energy QCD dynamics from bottom flavor fragmentation at the Hi-Lumi LHC
The European Physical Journal C ( IF 4.4 ) Pub Date : 2024-04-10 , DOI: 10.1140/epjc/s10052-024-12704-x
Francesco Giovanni Celiberto

We study the inclusive production of hadrons with bottom flavor at the LHC and its luminosity upgrade. We describe the collinear fragmentation of singly b-flavored hadrons, B mesons and \(\Lambda _b\) baryons, via the KKSS07 determination of fragmentation functions, while for charmed B mesons, \(B_c(^1S_0)\) and \(B_c(^3S_1)\) particles, we employ the novel ZCFW22 set, built on the basis of state-of-the-art nonrelativistic QCD inputs. We use the Jethad multimodular working environment to analyze rapidity and transverse-momentum distributions for observables sensitive to the associated emission of two hadrons or a hadron-plus-jet system. Our reference formalism is the \(\mathrm{NLL/NLO^+}\) hybrid collinear and high-energy factorization, where the standard collinear description is improved by the inclusions of energy logarithms resummed up to the next-to-leading approximation and beyond. We provide corroborating evidence that b-flavor emissions act as fair stabilizers of the high-energy resummation, thus serving as valuable tools for precision studies of high-energy QCD. As a bonus, we highlight that the predicted production-rate hierarchy between noncharmed b-hadrons and charmed \(B_c(^1S_0)\) mesons is in line with recent LHCb estimates. This serves as simultaneous benchmark both for the hybrid factorization and for the single-parton fragmentation mechanism based on initial-scale inputs calculated via the nonrelativistic QCD effective theory.



中文翻译:

Hi-Lumi LHC 底部风味碎片的高能 QCD 动力学

我们研究大型强子对撞机中具有底部味道的强子的包容性生产及其光度升级。我们通过KKSS07破碎函数的确定来描述单b味强子、B介子和\(\Lambda _b\)重子的共线破碎,而对于魅力B介子,\(B_c(^1S_0)\)\( B_c(^3S_1)\)粒子,我们采用新颖的ZCFW22集合,该集合建立在最先进的非相对论 QCD 输入的基础上。我们使用Jethad多模块工作环境来分析对两个强子或强子加喷射系统的相关发射敏感的可观测量的速度和横向动量分布。我们的参考形式是\(\mathrm{NLL/NLO^+}\)混合共线和高能分解,其中标准共线描述通过包含恢复到次领先近似值的能量对数而得到改进,并且超过。我们提供了确凿的证据,证明b味发射可以作为高能恢复的公平稳定剂,从而成为高能 QCD 精确研究的宝贵工具。作为奖励,我们强调非魅力b强子和魅力\(B_c(^1S_0)\)介子之间的预测生产率等级与最近的 LHCb 估计一致。这可以作为混合分解和基于通过非相对论 QCD 有效理论计算的初始尺度输入的单部分碎片机制的同时基准。

更新日期:2024-04-10
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