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Published November 7, 2014 | Submitted + Published
Journal Article Open

Probing the Higgs Couplings to Photons in h → 4ℓ at the LHC


We explore the sensitivity of the Higgs decay to four leptons, the so-called golden channel, to higher dimensional loop-induced couplings of the Higgs boson to ZZ, Zγ, and γγ, allowing for general CP mixtures. The larger standard model tree level coupling hZ^μZμ is the dominant "background" for the loop induced couplings. However this large background interferes with the smaller loop induced couplings, enhancing the sensitivity. We perform a maximum likelihood analysis based on analytic expressions of the fully differential decay width for h→4ℓ (4ℓ≡2e2μ,4e,4μ) including all interference effects. We find that the spectral shapes induced by Higgs couplings to photons are particularly different than the hZ^μZ_μ background leading to enhanced sensitivity to these couplings. We show that even if the h→γγ and h→4ℓ rates agree with that predicted by the Standard Model, the golden channel has the potential to probe both the CP nature as well as the overall sign of the Higgs coupling to photons well before the end of high-luminosity LHC running (∼3 ab^(−1)).

Additional Information

© 2014 American Physical Society. R. V. M. is supported by the European Research Council (ERC) Advanced Grant Higgs@LHC. Fermilab is operated by Fermi Research Alliance, Limited Liability Company (LLC), under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. Y. C. is supported by the Weston Havens Foundation and DOE Grant No. DE-FG02-92-ER-40701. This work is also sponsored in part by the DOE Grant No. DE-FG02-91ER40684. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant No. OCI-1053575. FERMILAB-PUB-14-048-PPD-T, LPT-Orsay-14-13, CALT 68-2883, nuhep-th/14-02

Attached Files

Published - PhysRevLett.113.191801.pdf

Submitted - 1404.1336v1.pdf


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October 26, 2023