A light pseudoscalar near the Υ(1S) mass, mixing with two Higgs doublets in the alignment limit, accounts for the anomalous ditau rate while evading existing constraints.
Simplified Models for Dark Matter Face their Consistent Completions
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abstract
Simplified dark matter models have been recently advocated as a powerful tool to exploit the complementarity between dark matter direct detection, indirect detection and LHC experimental probes. Focusing on pseudoscalar mediators between the dark and visible sectors, we show that the simplified dark matter model phenomenology departs significantly from that of consistent ${SU(2)_{\mathrm{L}} \times U(1)_{\mathrm{Y}}}$ gauge invariant completions. We discuss the key physics simplified models fail to capture, and its impact on LHC searches. Notably, we show that resonant mono-Z searches provide competitive sensitivities to standard mono-jet analyses at $13$ TeV LHC.
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2026 1verdicts
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Hiding in the Shadow of the Upsilon: Ditaus from a Light Pseudoscalar
A light pseudoscalar near the Υ(1S) mass, mixing with two Higgs doublets in the alignment limit, accounts for the anomalous ditau rate while evading existing constraints.