Resonant heavy Higgs searches at the HL-LHC

Adhikary, Amit; Banerjee, Shankha; Barman, Rahool Kumar; Bhattacherjee, Biplob

Abstract

In this work, we show the importance of searches for heavy resonant scalars (H) and pseudoscalars (A). Taking cue from the present searches, we make projections for searches in an extended scalar sector at the high luminosity run of the Large Hadron Collider. We study the three most relevant search channels, i.e., H → hh, H/A → t t¯ and bbH/A. Upon studying multifarious final states for the resonant double Higgs production, we find that the b b¯¯ γγ (σ(pp → H → hh) ∈ [81.27, 14.45] fb for mH ∈ [300, 600] GeV at 95% C.L.) and b b¯¯ b b¯¯ ([5.4, 2.5] fb for mH ∈ [800, 1000] GeV at 95% C.L.) channels are the most constraining. For the b b¯¯ H channel, we can exclude σ(pp → b b¯¯ H) ∈ [22.2, 3.7] fb for mH ∈ [300, 500] GeV. Finally, we consider the phenomenological Minimal Supersymmetric Standard Model as an example and impose various present constraints and our future direct search-limits and obtain strong constraints on the mA − tan β parameter space, where mA and tan β are respectively the mass of the pseudoscalar and the ratio of the vacuum expectation values of the two Higgs doublets. Assuming that the heavy Higgs boson decays only to Standard Model (SM) states, we find that the H → hh → b b¯¯ γγ (H → t t¯ ) channel excludes tan β as low as 4 (mA ∈ [400,800]GeV) at 95% CL. This weakens up to ∼ 5.5 when the b b¯¯ H channel dominates. Upon allowing for non-SM decay modes, the limits weaken.

Citation

Adhikary, A., Banerjee, S., Barman, R. K., & Bhattacherjee, B. (2019). Resonant heavy Higgs searches at the HL-LHC. Journal of High Energy Physics, 2019(9), Article 068. https://doi.org/10.1007/jhep09%282019%29068

• Journal Article Type: Article
• Acceptance Date: Sep 1, 2019
• Online Publication Date: Sep 10, 2019
• Publication Date: Sep 30, 2019
• Deposit Date: Sep 19, 2019
• Publicly Available Date: Sep 19, 2019
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2019
• Issue: 9
• Article Number: 068
• DOI: https://doi.org/10.1007/jhep09%282019%29068
• Public URL: https://durham-repository.worktribe.com/output/1286104