局域与全局事例条件对直接粲强子比值的影响
Impact of local and global event conditions in prompt charm hadron ratios
AI总结：
本研究用Pythia 8.312实现SC-CR等模型，发现其能重现√s=13 TeV下不同事例条件的直接粲强子比值，且重子与介子强子化对相关条件的响应存在差异。
AI中文摘要：
从电子-质子与电子-正电子碰撞中提取的碎裂函数无法解释大型强子对撞机（LHC）能量下质子-质子碰撞中的直接粲强子比值。为准确描述ALICE实验在不同质心系能量下质子-质子碰撞的数据，已开发新模型并调整事例产生器参数。本研究采用Pythia 8.312实现其中两个模型：SC-CR与BLC-CR + Ropes。二者在质心系能量√s=13 TeV下，针对不同事例条件下的Λ_c⁺/D⁰、Σ_c^(0,+,++)/D⁰、D⁺/D⁰及D*⁺/D⁰比值，均表现出良好的数据重现能力。对于直接粲强子位于喷注内的特定情况，所有比值均相对于不要求喷注存在的情况发生了修正。本研究还在相对横动量活性的两个不同区间开展了分析，结果显示仅重子与介子的比值对 underlying 事例活性存在依赖，表明重子与介子的强子化对局域效应或全局事例条件的响应方式不同。
英文摘要：
Fragmentation functions extracted from electron-proton and electron-positron collisions have shown not to be able to explain prompt charm hadron ratios in proton-proton collisions at the LHC energies. New models and event generator tunes have been developed to correctly describe the data from the ALICE experiment in proton-proton collisions at different center of mass energies. In this work Pythia 8.312 is used to implement two of those models: the SC-CR and BLC-CR + Ropes. Both show a good performance to reproduce the data at \sqrt{s}} = 13 TeV in different event conditions for the $Λ_{c}^{+}/\rm{D}^0$, $Σ_{c}^{0,+,++}/\rm{D}^0$, $\rm{D}^{+}/\rm{D}^0$ and $\rm{D}^{*+}/\rm{D}^0$ ratios. For the particular case when the prompt charm hadrons are within jets, all the ratios show modifications relative to the case where the presence of jets is not required. A study in two different ranges of the relative transverse activity is also conducted. In this case only the baryon to meson ratios show a dependence on the underlying event activity. Results indicate that baryon and meson hadronisation are not affected in the same way by local effects or global event conditions
