应bat365官网平台、稀有同位素前沿科学中心邀请，南京师范大学王烨凡副研究员将于2025年2月11日来校进行学术交流并作报告。

报告题目：Analytic decay width of the Higgs boson to massive bottom quarks at order $\alpha_s^3$

报告时间：2025年2月11日（星期二）16 : 00

报告地点：bat365官方网站二分部现物楼214室

腾讯会议：857-184-867

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【报告摘要】

The Higgs boson decay into bottom quarks is the dominant decay channel contributing to its total decay width, which can be used to measure the bottom quark Yukawa coupling and mass. This decay width has been computed up to $\mathcal{O}(\alpha_s^4)$ for the process induced by the bottom quark Yukawa coupling assuming massless final states, and the corresponding corrections beyond $\mathcal{O}(\alpha_s^2)$ are found to be less than $0.2\%$. We present an analytical result for the decay into massive bottom quarks at $\mathcal{O}(\alpha_s^3)$ including the contribution from the top quark Yukawa coupling induced process. We have made use of the optical theorem,  canonical differential equations and the regular basis in the calculation and expressed the result in terms of multiple polylogarithms and elliptic functions. We propose a systematic and unified procedure to derive the $\eps$-factorized differential equation for the three-loop kite integral family, which include the three-loop banana integrals as a sub-sector. We find that the $\mathcal{O}(\alpha_s^3)$ corrections increase the decay width by $1\%$ because of the large logarithms $\log^I m_H^2/m_b^2$ in the small bottom quark mass limit. The coefficient of the double logarithms is proportional to $C_A-C_F$, a typical color structure in the resummation of soft quark contributions at subleading power.

【报告人简介】

Yefan Wang received his BS. from Shandong University in 2016 and Ph.D. from Institute for High Energy Physics in 2021. He served as a postdoctoral researcher at Shandong University (2021-2024). He joined Nanjing Normal University in 2024. His research interest includes precision tests of the Standard Model of particle physics, high-order QCD corrections and the computation of Feynman loop integrals.    

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稀有同位素前沿科学中心

2025年2月8日