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Study of Electroweak Phase Transition in Exotic Higgs Decays at the CEPC

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arxiv 2203.10184 v1 pith:AE6EKOAS submitted 2022-03-18 hep-ex hep-ph

Study of Electroweak Phase Transition in Exotic Higgs Decays at the CEPC

Zhen Wang , Xuliang Zhu , Elham E Khoda , Shih-Chieh Hsu , Nikolaos Konstantinidis , Ke Li , Shu Li , Michael J. Ramsey-Musolf
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Yanda Wu Yuwen E. Zhang
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classification hep-ex hep-ph
keywords bosondecayshiggscepclightelectroweakewptexotic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A strong first-order electroweak phase transition (EWPT) can be induced by light new physics weakly coupled to the Higgs. This study focuses on a scenario in which the first-order EWPT is driven by a light scalar $s$ with a mass between 15-60 GeV. A search for exotic decays of the Higgs boson into a pair of spin-zero particles, $h \to ss$, where the $s$-boson decays into $b$-quarks promptly is presented. The search is performed in events where the Higgs boson is produced in association with a $Z$ boson, giving rise to a signature of two charged leptons (electrons or muons) and multiple jets from $b$-quark decays. The analysis is considering a scenario of analysing 5000 fb$^{-1}$ $e^+ e^-$ collision data at $\sqrt{s} = 240 $ GeV from the Circular Electron Positron Collider (CEPC). This study with $4b$ final state conclusively tests the expected sensitivity of probing the light scalars in the CEPC experiment. The sensitivity reach is significantly larger than that can be achieved at the LHC.

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Cited by 5 Pith papers

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