Work

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

Year: 2024

Type: article

Abstract: 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 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.

Source: Chinese Physics C

DOI: 10.1088/1674-1137/ad94e0

Authors: Jiawei 佳伟 Zhu 朱, Yujin 昱锦 Song 宋, Jun 俊 Gao 高, Daekyoung Kang, Tanmay Maji

Institutions: Korea University, Fudan University, National Institute of Technology Kurukshetra

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,295

Funders: National Natural Science Foundation of China, Science and Engineering Research Board, National Key Research and Development Program of China