Angularity in Higgs boson decays via H→gg at NNLL'accuracy  

作　　者：Jiawei Zhu Yujin Song Jun Gao Daekyoung Kang Tanmay Maji 朱佳伟;宋昱锦;高俊;Daekyoung Kang;Tanmay Maji(Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics,Fudan University,Shanghai 200433,China;School of Physics and Astronomy,Shanghai Key Laboratory for Particle Physics and Cosmology,and Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Jiao Tong University,Shanghai 200240,China;Department of Physics,Korea University,Seoul 02841,Korea;Department of Physics,National Institute of Technology,Kurukshetra,Haryana 136119,India)

机构地区：[1]Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics,Fudan University,Shanghai 200433,China [2]School of Physics and Astronomy,Shanghai Key Laboratory for Particle Physics and Cosmology,and Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Jiao Tong University,Shanghai 200240,China [3]Department of Physics,Korea University,Seoul 02841,Korea [4]Department of Physics,National Institute of Technology,Kurukshetra,Haryana 136119,India

出　　处：《Chinese Physics C》2025年第2期60-80,共21页中国物理C(英文版)

基　　金：Supported by the National Key Research and Development Program of China(2020YFA0406301);the National Natural Science Foundation of China(12150610461);Jun Gao Sponsored by the National Natural Science Foundation of China(12275173,11835005);Tanmay Maji Supported by the Science and Engineering Research Board(SERB)through the SRG(Start-up Research Grant)of File(SRG/2023/001093)。

摘　　要：We present improved predictions of a class of event-shape distributions called angularity for a contribution from an effective operator in Higgs hadronic decay that suffers from large perturbative uncertainties.In the framework of the soft-collinear effective theory,logarithmic terms of the distribution are resummed at NNLL'accuracy,for which a two-loop constant of gluon-jet function for angularity is independently determined using a fit to the fixed-order distribution at the NLO corresponding to O(a_(s)^(2))relative to the Born rate.Our determination has reasonable agreement with the value in a recently released thesis.In the fit,we use an asymptotic form with a fractional power conjectured from recoil corrections at one-loop order,and it improves the accuracy of determining positive values of the angularity parameter a.The resummed distribution is matched to the NLO fixed-order results to make our predictions valid at all angularity values.We also discuss the first and subtracted moments of angularity as a function of a that enable the extraction of information on leading and subleading nonperturbative corrections associated with gluons.

关 键 词：Higgs decay soft-collinear effective theory ANGULARITY RESUMMATION 

分 类 号：O57[理学—粒子物理与原子核物理]