Chargino and neutralino production at $$e^+e^-$$ e + e - colliders in the complex MSSM: a full one-loop analysis

Heinemeyer, S.; Schappacher, C.

doi:10.1140/epjc/s10052-017-5195-9

“…The anticipated energies and integrated luminosities are listed in Table 8. The cross-section predictions are based on tree-level results, obtained as in [110,111], where it was shown that the full one-loop corrections can amount up to 10-20%. 6 We do not attempt any rigorous experimental analysis, but follow the idea that to a good approximation final states with the sum of the masses smaller than the center-of-mass energy can be detected [113][114][115].…”

Section: Hl-lhc Prospectsmentioning

confidence: 99%

“…Including full one-loop corrections here as in[110,111] would have required to determine the preferred choice of the renormalization scheme for each point individually (see[112] for details), which goes beyond the scope of this analysis.…”

mentioning

confidence: 99%

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

Chakraborti

¹

,

Heinemeyer

²

,

Saha

³

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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“…4. We thank C. Schappacher for evaluating the mass shift for our wino DM points (following Ref [117]…”

mentioning

confidence: 99%

Improved $${(g-2)_\mu }$$ measurements and wino/higgsino dark matter

Chakraborti

¹

,

Heinemeyer

²

,

Saha

³

2021

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The electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) can account for a variety of experimental data. In particular it can explain 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. The lightest supersymmetric particle (LSP), which we take as the lightest neutralino, $${\tilde{\chi }}_{1}^0$$ χ ~ 1 0 , can furthermore 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. Concerning the unsuccessful searches for EW particles at the LHC, owing to relatively small production cross-sections a comparably light EW sector of the MSSM is in full agreement with the experimental data. The DM relic density can fully be explained by a mixed bino/wino LSP. Here we take the relic density as an upper bound, which opens up the possibility of wino and higgsino DM. 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 roughly 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 . We interpret these upper bounds in view of future HL-LHC EW searches as well as future high-energy $$e^+e^-$$ e + e - colliders, such as the ILC or CLIC.

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“…Another important conclusion is that theW orH-dominatedχ ± 1 is always lighter than about 700 GeV. Taking into account its production cross-section at linear e + e − colliders [149], one can infer thatχ ± 1 is very likely to be discovered at the CLIC, whose collision energy can reach 3 TeV [150][151][152][153]. This point was recently emphasized by the authors of [46,47].…”

Section: Jhep09(2021)175mentioning

confidence: 99%

Improved (g − 2)μ measurement and singlino dark matter in μ-term extended ℤ3-NMSSM

Cao

¹

,

Lian

²

,

Pan

³

et al. 2021

J. High Energ. Phys.

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Very recently, a Fermilab report of muon g− 2 showed a 4.2σ discrepancy between it and the standard model (SM) prediction. Motivated by this inspiring result and the increasing tension in supersymmetric interpretation of the anomalous magnetic moment, it is argued that in the general next-to-minimal supersymmetric standard model (GNMSSM), a singlino-dominated neutralino can act as a feasible dark matter (DM) candidate in explaining the discrepancy naturally. In this case, the singlino-dominated DM and singlet-dominated Higgs bosons can form a secluded DM sector with $$ {\overset{\sim }{\chi}}_1^0{\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 χ ~ 1 0 → hsAs responsible for the measured DM relic abundance when $$ {m}_{{\overset{\sim }{\chi}}_1^0} $$ m χ ~ 1 0 ≳ 150 GeV and the Yukawa coupling κ is around 0.2. This sector communicates with the SM sector by weak singlet-doublet Higgs mixing, so the scatterings of the singlino-dominated DM with nucleons are suppressed. Furthermore, due to the singlet nature of the DM and the complex mass hierarchy, sparticle decay chains in the GNMSSM are lengthened in comparison with the prediction of the minimal supersymmetric standard model. These characteristics lead to sparticle detection at the Large Hadron Collider (LHC) being rather tricky. This study surveys a specific scenario of the GNMSSM, which extends the ℤ3-NMSSM by adding an explicit μ-term, to reveal the features. It indicates that the theory can readily explain the discrepancy of the muon anomalous magnetic moment without conflicting with the experimental results in DM and Higgs physics, and the LHC searches for sparticles.

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Chargino and neutralino production at $$e^+e^-$$ e + e - colliders in the complex MSSM: a full one-loop analysis

Cited by 10 publications

References 125 publications

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

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

Improved $${(g-2)_\mu }$$ measurements and wino/higgsino dark matter

Improved (g − 2)μ measurement and singlino dark matter in μ-term extended ℤ3-NMSSM

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