AI 中文总结
CMS实验利用√s=13TeV、积分亮度59.8 fb⁻¹的质子-质子碰撞数据，通过测量底夸克喷注辐射密度，以4.3倍标准偏差证实含死锥效应的部分子簇射模型更符合实验结果，为死锥效应提供了实验证据。
AI 中文摘要
重夸克的共线胶子辐射被抑制，即“死锥效应”，是部分子簇射中夸克质量效应的主要表现形式。本文分析了CMS实验在质心系能量√s=13TeV下记录的质子-质子碰撞数据集，其积分亮度为59.8 fb⁻¹。研究对底夸克喷注的辐射密度进行了微分测量，该测量以迭代去簇子喷注之间的角分离为函数，测量对象为来自顶夸克对产生、横动量在40至200GeV之间的底夸克触发喷注。与数据相比，包含死锥效应的部分子簇射蒙特卡罗模型更受青睐，而不包含死锥效应的模型则被否定，显著性为4.3个标准偏差。
英文摘要
The suppression of collinear gluon emissions from a massive quark, or the ``dead-cone effect,'' is the primary manifestation of quark mass effects in parton showers. A proton-proton collision data set recorded by the CMS experiment at $\sqrt{s}$ = 13 TeV with an integrated luminosity of 59.8 fb$^{-1}$ is analyzed. A differential measurement is presented of the emission density of bottom quark jets, studied as a function of the angular separation between iteratively declustered subjets. The measurement is performed in bottom quark initiated jets with transverse momenta between 40 and 200 GeV originating from top quark pair production. Compared to data, a parton shower Monte Carlo model that includes the dead-cone effect is favored, while a model without the dead-cone effect is disfavored with a significance of 4.3 standard deviations.
CommentsSubmitted to Physical Review Letters. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-25-008 (CMS Public Pages)
