Abstract
We propose to utilize angularity distributions in Higgs boson decay to probe light quark Yukawa couplings at e+e− colliders. Angularities τa are a class of 2-jet event shapes with variable and tunable sensitivity to the distribution of radiation in hadronic jets in the final state. Using soft-collinear effective theory (SCET), we present a prediction of angularity distributions from Higgs decaying to quark and gluon states at e+e− colliders to NNLL + 𝒪(αs) accuracy. Due to the different color structures in quark and gluon jets, the angularity distributions from H → \(q\overline{q }\) and H → gg show different behaviors and can be used to constrain the light quark Yukawa couplings. We show that the upper limit of light quark Yukawa couplings could be probed to the level of ~ 15% of the bottom quark Yukawa coupling in the Standard Model in a conservative analysis window far away from nonperturbative effects and other uncertainties; the limit can be pushed to ≲ 7 – 9% with better control of the nonperturbative effects especially on gluon angularity distributions and/or with multiple angularities.
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Acknowledgments
BY would like to thank Zhongbo Kang and C.-P. Yuan for useful discussions, and Wan-Li Ju for discussions about the calculation of thrust in Higgs decay. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, and through an Early Career Research Award. Portions of the work were also supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project numbers 20190033ER and 20200775PRD4. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001). BY is also supported by the IHEP under Contract No. E25153U1.
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Yan, B., Lee, C. Probing light quark Yukawa couplings through angularity distributions in Higgs boson decay. J. High Energ. Phys. 2024, 123 (2024). https://doi.org/10.1007/JHEP03(2024)123
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DOI: https://doi.org/10.1007/JHEP03(2024)123