发表机构
University of Science and Technology of China; Central China Normal University; European Organization for Nuclear Research; Fudan University（中国科学技术大学; 华中师范大学; 欧洲核子研究组织; 复旦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过贝叶斯展开ALICE和LHCb数据，测量p-Pb碰撞中美强子产生，首次给出全快度范围R_pPb，并发现美强子冷核物质抑制弱于粲强子。
AI 中文摘要
质子-原子核碰撞中的美强子产生是探测冷核物质（CNM）效应的特别有力的探针：得益于美夸克的大质量，其产生过程在早期硬散射中启动，并可在微扰QCD框架内计算，而在核碰撞中观察到的修正直接约束了与粲夸克所触及的运动学区域互补的核部分子分布函数（nPDFs）。精确量化这些效应是隔离重离子碰撞中夸克-胶子等离子体形成可能信号的前提。本研究通过数据驱动的贝叶斯展开方法，利用ALICE和LHCb对非瞬发D^0和J/ψ介子的测量，研究了在\sqrt{s_{\mathrm{NN}}} = 5.02 和 8.16 TeV 的p-Pb碰撞中开放美强子的产生。展开后的p_T微分和y微分截面在不同衰变道之间相互一致，并与直接重建的美强子测量结果兼容。核修正因子R_{pPb}作为横动量和快度的函数被报告，提供了首个基于展开方法、覆盖-4.0 < y < 4.0全快度范围的美强子R_{pPb}结果，其精度与现有数据相当或更优。结果与基于nPDFs的计算进行了比较，可为未来的全局nPDF拟合提供有价值的约束。同时报告了p-Pb碰撞中总包含B强子产生截面。观察到美强子的冷核物质抑制弱于粲强子，这与冷核物质效应的预期质量层级一致。
英文摘要
Beauty-hadron production in proton-nucleus collisions is a particularly powerful probe of cold nuclear matter (CNM) effects: thanks to the large beauty-quark mass, the production is initiated in early hard scatterings and is calculable in perturbative QCD, while the modifications observed in nuclear collisions directly constrain the nuclear parton distribution functions (nPDFs) in a kinematic region complementary to that accessed by charm. Precisely quantifying these effects is a prerequisite for isolating possible signatures of quark-gluon plasma formation in heavy-ion collisions. In this work, the production of open beauty hadrons in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ and $8.16$~TeV is studied via a data-driven Bayesian unfolding of ALICE and LHCb measurements of non-prompt $D^{0}$ and J/$ψ$ mesons. The unfolded $p_{T}$- and $y$-differential cross sections are mutually consistent across decay channels and compatible with directly reconstructed beauty-hadron measurements. The nuclear modification factor $R_{pPb}$ is reported as a function of transverse momentum and rapidity, providing the first unfolding-based result spanning $-4.0 < y < 4.0$ of beauty-hadron $R_{pPb}$ covering the full rapidity range, with a precision comparable to or better than that of existing data. The results are compared with calculations based on nPDFs and can provide valuable constraints for future global nPDF fits. The total inclusive B hadron production cross section in p-Pb collisions is also reported. A weaker CNM suppression is observed for beauty hadrons than for charm hadrons, consistent with the expected mass hierarchy of cold-nuclear-matter effects.
Comments22 pages, 15 figures
