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arXiv 1812.03348hep-ph
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真空和QCD介质中的射流分裂功能

Jet splitting functions in the vacuum and in a QCD medium

Hai Tao Li, Ivan Vitev

摘要:

与重构喷流内部的主导子喷流相关的两叉结构为部分子簇射的介质内修正的精确约束开辟了新的途径。在这次演讲中,我们提出了第一次计算的软下降梳理动量共享分布,或射流分裂功能,在重离子碰撞轻喷流和重味标记的射流。RHIC STAR实验和LHC CMS实验的现有光喷流分裂函数数据可以在Glauber胶子相互作用的软共线有效理论的统一框架下理解。对于重味喷流,非常有趣的是,与轻喷流相比,b标记喷流的动量共享分布被更强烈地修改,这提供了一种新的处理介质中部分子簇射的质量校正的方法,目前难以使用包含重介子产生来约束。

英文摘要:

The two-prong structure related to the leading subjets inside a reconstructed jet opens new avenues toward precision constraints on the in-medium modification of parton showers. In this talk, we present the first resummed calculation of the soft-dropped groomed momentum sharing distribution, or the jet splitting function, in heavy-ion collisions for both light jets and heavy flavor tagged jets. Existing light jet splitting function data from the STAR experiment at RHIC and the CMS experiment at LHC can be understood in the unified framework of soft-collinear effective theory with Glauber gluon interactions. For heavy flavor jets, very interestingly, the momentum sharing distribution of b-tagged jets is more strongly modified in comparison to the one for light jets, which provides a novel handle on mass corrections to in-medium parton showers that are at present difficult to constraint using inclusive heavy meson production.

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