Prospects for exotic h → 4 τ decays in single and di-Higgs boson production at the LHC and future hadron colliders

Adhikary, Amit; Banerjee, Shankha; Barman, Rahool Kumar; Batell, Brian; Bhattacherjee, Biplob; Bose, Camellia; Qian, Zhuoni; Spannowsky, Michael

doi:10.1103/PhysRevD.109.055008

Title: Prospects for exotic $h \to 4 τ$ decays in single and di-Higgs boson production at the LHC and future hadron colliders

Journal Article · 07 March 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.055008 · OSTI ID:2320317

; Banerjee, Shankha; Barman, Rahool Kumar; Batell, Brian; Bhattacherjee, Biplob;

; Qian, Zhuoni; Spannowsky, Michael

We study the prospects for observing exotic decays of the Standard Model Higgs boson $h$ into light beyond the Standard Model scalars $a$ with mass $m_{a} ≲ m_{h} / 2$ in the single Higgs and Higgs pair production channels at the high luminosity run of the Large Hadron Collider (HL-LHC). Discovery prospects for single Higgs production in the gluon-gluon fusion and vector boson fusion modes with the Higgs boson decaying via the exotic mode $h \to a a \to 4 τ$ are analyzed at the HL-LHC. The projected sensitivity for exotic Higgs decays in the nonresonant Higgs pair production channel $p p \to h h \to (h \to b \bar{b}) (h \to a a \to 4 τ) \to 2 b 4 τ$ at the HL-LHC and a future $\sqrt{s} = 100 TeV$ hadron collider (FCC-hh) are also estimated. Furthermore, we study HL-LHC’s potential reach for the Higgs-strahlung process in the $2 b 4 τ$ channel, taking into account the contamination from nonresonant Higgs pair production. Finally, the potential reach for resonant Higgs pair production in the $2 b 4 τ$ channel at the HL-LHC is also explored for several choices of ${m_{H}, m_{a}}$ . Our studies suggest that significant improvements over existing bounds are achievable in several production channels, motivating new dedicated searches for $h \to a a \to 4 τ$ at the HL-LHC and future colliders. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0016013; SC0007914

OSTI ID:: 2320317

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 109 Journal Issue: 5; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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