摘要
In this study,we investigate the invariant-mass distribution of top-quark pairs near the 2mt threshold,which strongly influences the determination of the top-quark mass mt.Higher-order non-relativistic corrections lead to large contributions,which are not included in the state-of-the-art theoretical predictions.A factorization formula is derived to resum such corrections to all orders in the strong-coupling,and necessary ingredients are calculated to perform the resummation at next-to-leading power.We combine the resummation with fixed-order results and present phenomenologically relevant numerical results.The resummation effect significantly increases the differential cross-section in the threshold region and makes the theoretical prediction more compatible with experimental data.We estimate that using our prediction in the determination of mt will lead to a value closer to the direct measurement result.
作者
Wan-Li Ju
Guoxing Wang
Xing Wang
Xiaofeng Xu
Yongqi Xu
Li Lin Yang
鞠万里;王国兴;王星;徐小峰;徐永琪;杨李林(School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China;Institute for Particle Physics Phenomenology,Durham University,Durham DH13LE,UK;PRISMA+Cluster of Excellence&Mainz Institute for Theoretical Physics,Johannes Gutenberg University,55099 Mainz,Germany;Institut für Theoretische Physik,Universität Bern,Sidlerstrasse 5,CH-3012 Bern,Switzerland;Zhejiang Institute of Modern Physics,Department of Physics,Zhejiang University,Hangzhou 310027,China)
基金
Supported in part by the National Natural Science Foundation of China(11975030,11635001,11575004)
W.-L.Ju was Supported in part by the China Postdoctoral Science Foundation(2017M610685)。
