Full two-loop QCD corrections to the Higgs mass in the MSSM with heavy superpartners

Bagnaschi, Emanuele; Degrassi, Giuseppe; Paßehr, Sebastian; Slavich, Pietro

doi:10.1140/epjc/s10052-019-7417-9

Cited by 39 publications

(55 citation statements)

References 165 publications

(318 reference statements)

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“…5 In this scenario light charginos and neutralinos are present, suppressing the τ τ decay mode and thus yielding relatively weak limits in the M A -tan β plane (see Fig. 5 in [105]). The black lines correspond to mχ0 1 = M A /2, i.e.…”

Section: 1χ ± 1 -Coannihilation Regionmentioning

confidence: 99%

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Improved $$(g-2)_\mu $$ measurements and supersymmetry

2020

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The electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) can account for variety of experimental data. The lighest supersymmetric particle (LSP), which we take as the lightest neutralino, $${\tilde{\chi }}_{1}^0$$ χ ~ 1 0 , can account for the observed Dark Matter (DM) content of the universe via coannihilation with the next-to-LSP (NLSP), while being in agreement with negative results from Direct Detection (DD) experiments. Owing to relatively small production cross-sections a comparably light EW sector of the MSSM is also in agreement with the unsuccessful searches at the LHC. Most importantly, the EW sector of the MSSM can account for the persistent $$3-4\,\sigma $$ 3 - 4 σ discrepancy between the experimental result for the anomalous magnetic moment of the muon, $$(g-2)_\mu $$ ( g - 2 ) μ , and its Standard Model (SM) prediction. Under the assumption that the $${\tilde{\chi }}_{1}^0$$ χ ~ 1 0 provides the full DM relic abundance we first analyze which mass ranges of neutralinos, charginos and scalar leptons are in agreement with all experimental data, including relevant LHC searches. We find an upper limit of $$\sim 600 \,\, \mathrm {GeV}$$ ∼ 600 GeV for the LSP and NLSP masses. In a second step we assume that the new result of the Run 1 of the “MUON G-2” collaboration at Fermilab yields a precision comparable to the existing experimental result with the same central value. We analyze the potential impact of the combination of the Run 1 data with the existing $$(g-2)_\mu $$ ( g - 2 ) μ data on the allowed MSSM parameter space. We find that in this case the upper limits on the LSP and NLSP masses are substantially reduced by roughly $$100 \,\, \mathrm {GeV}$$ 100 GeV . This would yield improved upper limits on these masses of $$\sim 500 \,\, \mathrm {GeV}$$ ∼ 500 GeV . In this way, a clear target could be set for future LHC EW searches, as well as for future high-energy $$e^+e^-$$ e + e - colliders, such as the ILC or CLIC.

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Section: 1χ ± 1 -Coannihilation Regionmentioning

confidence: 99%

“…In Fig. 6 we also show as black lines the current bound from LHC searches for heavy neutral Higgs bosons [105] in the channel pp → H/A → τ τ in the M 125 h (χ) benchmark scenario (based on the search data published in Refs. [106,107] using 36 fb −1 .).…”

Section: 1χ ± 1 -Coannihilation Regionmentioning

confidence: 99%

Improved $$(g-2)_\mu $$ measurements and supersymmetry

2020

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“…This fixed-order approach, however, contains large logarithmic contributions, which can limit the accuracy of the perturbative expansion in case of a high SUSY scale. Effective field theory (EFT) techniques have been used to resum the large logarithms providing a precise prediction for large SUSY scales (for recent works see [20][21][22][23][24][25][26][27][28][29]). Since typically no higher-dimensional operators are included, 2 terms suppressed by the SUSY scale are missed.…”

Section: Introductionmentioning

confidence: 99%

Theoretical uncertainties in the MSSM Higgs boson mass calculation

et al. 2020

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The remaining theoretical uncertainties from unknown higher-order corrections in the prediction for the light Higgs-boson mass of the MSSM are estimated. The uncertainties associated with three different approaches that are implemented in the publicly available code FeynHiggs are compared: the fixed-order diagrammatic approach, suitable for low SUSY scales, the effective field theory (EFT) approach, suitable for high SUSY scales, and the hybrid approach which combines the fixed-order and the EFT approaches. It is demonstrated for a simple single-scale scenario that the result based on the hybrid approach yields a precise prediction for low, intermediate and high SUSY scales with a theoretical uncertainty of up to ∼ 1.5 GeV for large stop mixing and ∼ 0.5 GeV for small stop mixing. The uncertainty estimate of the hybrid calculation approaches the uncertainty estimate of the fixed-order result for low SUSY scales and the uncertainty estimate of the EFT approach for high SUSY scales, while for intermediate scales it is reduced compared to both of the individual results. The estimate of the theoretical uncertainty is also investigated in scenarios with more than one mass scale. A significantly enhanced uncertainty is found in scenarios where the gluino is substantially heavier than the scalar top quarks. The uncertainty estimate presented in this paper will be part of the public code FeynHiggs.

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“…In the approach discussed, e.g., in Ref. [4], all SM quantities are evolved to the supersymmetric scale, which is usually of the order of a few TeV, where the matching between the SM and the MSSM is performed.…”

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confidence: 99%