Rare few-body decays of the Standard Model Higgs boson, by David d'Enterria, Van Dung Le

SciPost Physics Community Reports Home Authoring Refereeing Submit a manuscript About Rare few-body decays of the Standard Model Higgs boson David d'Enterria, Van Dung Le SciPost Phys. Comm. Rep. 20 (2026) · published 19 February 2026 Part of the Report 5 Collection in the LHC Higgs Working Group Reports Series. doi: 10.21468/SciPostPhysCommRep.20 pdf BiBTeX RIS Submissions/Reports Abstract We present a survey of rare and exclusive few-body decays of the standard model (SM) Higgs boson, defined as those into two to four final particles with branching fractions $\mathcal{B} ≲ 10^{-5}$. Studies of such decays can be exploited to constrain Yukawa couplings of quarks and leptons, probe flavour-changing Higgs decays, estimate backgrounds for exotic Higgs decays into beyond-SM particles, and/or confirm quantum chromodynamics factorization with small nonperturbative corrections. We collect the theoretical $\mathcal{B}$ values for about 70 unobserved Higgs rare decay channels, indicating their current experimental limits, and estimating their expected bounds in p-p collisions at the HL-LHC. Among those, we include 20 new decay channels computed for the first time for ultrarare Higgs boson decays into photons and/or neutrinos, radiative quark-flavour-changing exclusive decays, and radiative decays into leptonium states. This survey can help guide and prioritize upcoming experimental and theoretical studies of unobserved Higgs boson decays. × TY - JOURPB - SciPost FoundationDO - 10.21468/SciPostPhysCommRep.20TI - Rare few-body decays of the Standard Model Higgs bosonPY - 2026/02/19UR - https://scipost.org/SciPostPhysCommRep.20JF - SciPost Physics Community ReportsJA - SciPost Phys. Comm. Rep.SP - 20A1 - d'Enterria, DavidAU - Le, Van DungAB - We present a survey of rare and exclusive few-body decays of the standard model (SM) Higgs boson, defined as those into two to four final particles with branching fractions $\mathcal{B} ≲ 10^{-5}$. Studies of such decays can be exploited to constrain Yukawa couplings of quarks and leptons, probe flavour-changing Higgs decays, estimate backgrounds for exotic Higgs decays into beyond-SM particles, and/or confirm quantum chromodynamics factorization with small nonperturbative corrections. We collect the theoretical $\mathcal{B}$ values for about 70 unobserved Higgs rare decay channels, indicating their current experimental limits, and estimating their expected bounds in p-p collisions at the HL-LHC. Among those, we include 20 new decay channels computed for the first time for ultrarare Higgs boson decays into photons and/or neutrinos, radiative quark-flavour-changing exclusive decays, and radiative decays into leptonium states. This survey can help guide and prioritize upcoming experimental and theoretical studies of unobserved Higgs boson decays.ER - × @Article{10.21468/SciPostPhysCommRep.20, title={{Rare few-body decays of the Standard Model Higgs boson}}, author={David d'Enterria and Van Dung Le}, journal={SciPost Phys. Comm. Rep.}, pages={20}, year={2026}, publisher={SciPost}, doi={10.21468/SciPostPhysCommRep.20}, url={https://scipost.org/10.21468/SciPostPhysCommRep.20},} Ontology / Topics See full Ontology or Topics database. Higgs boson Large Hadron Collider (LHC) Authors / Affiliations: mappings to Contributors and Organizations See all Organizations. 1 David d'Enterria, 2 Van Dung Le 1 Organisation européenne pour la recherche nucléaire / European Organization for Nuclear Research [CERN] 2 Đại học Quốc gia Thành phố Hồ Chí Minh / Vietnam National University, Ho Chi Minh City [VNUHCM] Funder for the research work leading to this publication Horizon 2020 (through Organization: European Commission [EC])