Multi-Channel Di-Higgs Production in the scNMSSM: From Exotic 8b to Boosted 8tau Signatures at the HL-LHC
Abstract
We study the signal topologies of Higgs-pair production in the semi-constrained NMSSM at large lambda and low tan(beta) at the HL-LHC (sqrt(s) = 13.6 TeV, L = 3000 fb^-1), using four benchmark points drawn from a parameter scan in which the LHC Higgs-sector constraints were not applied. The benchmarks cover exotic h1h1 -> 4a1 -> 8b (BP1, BP3), boosted h1h1 -> 4a1 -> 8tau (BP2) and SM-like (BP4) final states. Signals are simulated with MadGraph5_aMC@NLO, Pythia 8.316 and Delphes 3, with 10^5 events per benchmark. Background yields are taken from published analyses and serve only as illustrative estimates. In this revised version (v2) we add an a posteriori check with NMSSMTools. All four benchmark points are flagged: BP1-BP3 have BR(h1 -> a1a1) > 99%, in conflict with the limits on undetected Higgs decays and with CMS searches for h -> aa -> 4tau and 4b, and BP4 deviates from the measured b- and tau-couplings by more than 2 sigma. The benchmarks therefore do not represent experimentally allowed parameter points, the signal yields apply to the stated branching fractions only, and the earlier statement of 5 sigma sensitivity is withdrawn. The signal rate scales as BR(h -> aa)^2, so a branching fraction compatible with current limits would reduce the yields by one to two orders of magnitude. The detector-level characterisation of the topologies remains of methodological interest. For BP2 (m_a1 = 8.2 GeV), 82.4% of same-a1 tau pairs satisfy Delta R(tau,tau) < 0.4 owing to the boost gamma ~ 7.5, which motivates dedicated boosted-a1 tagging.
Related
- Event-Level Classification of Boosted Multi-Tau Signatures in scNMSSM Di-Higgs Production
- Mechanisms of D D̅ pair production in e+ e− → e+ e− D D̅ and AA → AA D D̅ reactions and production of exotic charmonia
- Search for Higgs boson production in association with another Higgs or an exotic scalar boson in the bb̅W+W− single lepton final state at √s=13 TeV with the ATLAS experiment
- Search for boosted vector boson scattering W±W±H production in final states with same-sign leptons and b-jets in proton-proton collisions at √s=13 TeV with the ATLAS detector
- Observation of an excess at the top quark pair production threshold in the single-lepton channel
BibTeX
@misc{telba2026multichannel,
title = {{Multi-Channel Di-Higgs Production in the scNMSSM: From Exotic 8b to Boosted 8tau Signatures at the HL-LHC}},
author = {Marwa Telba},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.11040},
eprint = {2608.11040},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.11040},
}
RIS
TY - UNPB
TI - Multi-Channel Di-Higgs Production in the scNMSSM: From Exotic 8b to Boosted 8tau Signatures at the HL-LHC
AU - Marwa Telba
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2608.11040
UR - https://arxiv.org/abs/2608.11040
AB - We study the signal topologies of Higgs-pair production in the semi-constrained NMSSM at large lambda and low tan(beta) at the HL-LHC (sqrt(s) = 13.6 TeV, L = 3000 fb^-1), using four benchmark points drawn from a parameter scan in which the LHC Higgs-sector constraints were not applied. The benchmarks cover exotic h1h1 -> 4a1 -> 8b (BP1, BP3), boosted h1h1 -> 4a1 -> 8tau (BP2) and SM-like (BP4) final states. Signals are simulated with MadGraph5_aMC@NLO, Pythia 8.316 and Delphes 3, with 10^5 events per benchmark. Background yields are taken from published analyses and serve only as illustrative estimates. In this revised version (v2) we add an a posteriori check with NMSSMTools. All four benchmark points are flagged: BP1-BP3 have BR(h1 -> a1a1) > 99%, in conflict with the limits on undetected Higgs decays and with CMS searches for h -> aa -> 4tau and 4b, and BP4 deviates from the measured b- and tau-couplings by more than 2 sigma. The benchmarks therefore do not represent experimentally allowed parameter points, the signal yields apply to the stated branching fractions only, and the earlier statement of 5 sigma sensitivity is withdrawn. The signal rate scales as BR(h -> aa)^2, so a branching fraction compatible with current limits would reduce the yields by one to two orders of magnitude. The detector-level characterisation of the topologies remains of methodological interest. For BP2 (m_a1 = 8.2 GeV), 82.4% of same-a1 tau pairs satisfy Delta R(tau,tau) < 0.4 owing to the boost gamma ~ 7.5, which motivates dedicated boosted-a1 tagging.
ER -