Uncovering light scalars with exotic Higgs decays to $$ b\overline{b}{\mu}^{+}{\mu}^{-} $$
- Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics
- Stony Brook Univ., Stony Brook, NY (United States). C.N. Yang Inst. for Theoretical Physics
Here, the search for exotic Higgs decays are an essential probe of new physics. In particular, the small width of the Higgs boson makes its decay uniquely sensitive to the existence of light hidden sectors. Here we assess the potential of an exotic Higgs decay search for h → 2X → bb¯μ+μ– to constrain theories with light CP-even (X = s) and CP-odd (X = a) singlet scalars in the mass range of 15 to 60 GeV. This decay channel arises naturally in many scenarios, such as the Standard Model augmented with a singlet, the two-Higgs-doublet model with a singlet (2HDM + S) — which includes the Next-to-Minimal Supersymmetric Standard Model (NMSSM) — and in hidden valley models. The 2b2μ channel may represent the best discovery avenue for many models. It has competitive reach, and is less reliant on low-p T b- and τ-reconstruction compared to other channels like 4b, 4τ, and 2τ2μ. We analyze the sensitivity of a 2b2μ search for the 8 and 14 TeV LHC, including the HL-LHC. We consider three types of analyses, employing conventional resolved b-jets with a clustering radius of R ~ 0.4, thin b-jets with R = 0.2, and jet substructure techniques, respectively. The latter two analyses improve the reach for m X ~ 15 GeV, for which the two b-jets are boosted and often merged. We find that Br(h → 2X → 2b2μ) can be constrained at the few × 10–5 level across the entire considered mass range of X at the HL-LHC. This corresponds to a 1 – 10% reach in Br(h → 2X) in 2HDM + S models, including the NMSSM, depending on the type of Higgs Yukawa couplings.
- Research Organization:
- Stony Brook Univ., NY (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0008061
- OSTI ID:
- 1452789
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2015, Issue 6; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Exotic decays of the 125 GeV Higgs boson at future e + e − colliders
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journal | June 2017 |
Diphoton signal of a light pseudoscalar in the NMSSM at the LHC
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journal | February 2017 |
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