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Collider Interplay for Supersymmetry, Higgs and Dark Matter.

Buchmueller O, Citron M, Ellis J, Guha S, Marrouche J, Olive KA, de Vries K, Zheng J - Eur Phys J C Part Fields (2015)

Bottom Line: If supersymmetry is not discovered at the LHC, it is likely to lie somewhere along a focus-point, stop-coannihilation strip or direct-channel A / H resonance funnel.We discuss the prospects for discovering supersymmetry along these strips at a future circular proton-proton collider such as FCC-hh.Illustrative benchmark points on these strips indicate that also in this case FCC-ee could provide tests of the CMSSM at the loop level.

View Article: PubMed Central - PubMed

Affiliation: High Energy Physics Group, Blackett Lab., Imperial College, Prince Consort Road, London, SW7 2AZ UK.

ABSTRACT

We discuss the potential impacts on the CMSSM of future LHC runs and possible [Formula: see text] and higher-energy proton-proton colliders, considering searches for supersymmetry via  [Formula: see text] events, precision electroweak physics, Higgs measurements and dark matter searches. We validate and present estimates of the physics reach for exclusion or discovery of supersymmetry via [Formula: see text] searches at the LHC, which should cover the low-mass regions of the CMSSM parameter space favoured in a recent global analysis. As we illustrate with a low-mass benchmark point, a discovery would make possible accurate LHC measurements of sparticle masses using the MT2 variable, which could be combined with cross-section and other measurements to constrain the gluino, squark and stop masses and hence the soft supersymmetry-breaking parameters [Formula: see text] and [Formula: see text] of the CMSSM. Slepton measurements at CLIC would enable [Formula: see text] and [Formula: see text] to be determined with high precision. If supersymmetry is indeed discovered in the low-mass region, precision electroweak and Higgs measurements with a future circular [Formula: see text] collider (FCC-ee, also known as TLEP) combined with LHC measurements would provide tests of the CMSSM at the loop level. If supersymmetry is not discovered at the LHC, it is likely to lie somewhere along a focus-point, stop-coannihilation strip or direct-channel A / H resonance funnel. We discuss the prospects for discovering supersymmetry along these strips at a future circular proton-proton collider such as FCC-hh. Illustrative benchmark points on these strips indicate that also in this case FCC-ee could provide tests of the CMSSM at the loop level.

No MeSH data available.


The branching ratio for  along the stop-coannihilation strips for  and  (solid black line) and  (dashed blue line). In the latter case the branching ratio drops to a minimum  when , as seen in the lower right panel of Fig. 24
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Fig25: The branching ratio for along the stop-coannihilation strips for and (solid black line) and (dashed blue line). In the latter case the branching ratio drops to a minimum when , as seen in the lower right panel of Fig. 24

Mentions: Figure 24 displays the profiles of the focus-point strips in Fig. 23 (upper panels) and of the stop-coannihilation strips in Fig. 23 (lower panels), along their full lengths. Both pairs of profiles exhibit the values of calculated using SLHA files obtained using SSARD as inputs to FeynHiggs 2.10.0 (near-horizontal solid green lines), including uncertainty estimates of  GeV (near-horizontal dashed green lines). As already noted, only portions of the focus-point strips are compatible with the LHC measurement of (yellow bands) within these uncertainties, whereas in the cases of the stop-coannihilation strips there are significant additional uncertainties associated with the RGE running, and all portions of the strips are compatible with . In the cases of the stop-coannihilation strips in the lower panels of Fig. 24, we also display as blue lines the mass difference along the strips.15 In the examples shown, this mass difference is generally , so that the branching ratio for two-body decay usually dominates over that for four-body decay. However, this is not always the case, as illustrated by examples in [58] and by Fig. 25 for the stop-coannihilation strip with and . The branching ratio for decay may dominate when , as seen in the lower right panel of Fig. 24. Thus, a complete search for supersymmetry at FCC-hh should include searches for both the and the decay signatures.


Collider Interplay for Supersymmetry, Higgs and Dark Matter.

Buchmueller O, Citron M, Ellis J, Guha S, Marrouche J, Olive KA, de Vries K, Zheng J - Eur Phys J C Part Fields (2015)

The branching ratio for  along the stop-coannihilation strips for  and  (solid black line) and  (dashed blue line). In the latter case the branching ratio drops to a minimum  when , as seen in the lower right panel of Fig. 24
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4591918&req=5

Fig25: The branching ratio for along the stop-coannihilation strips for and (solid black line) and (dashed blue line). In the latter case the branching ratio drops to a minimum when , as seen in the lower right panel of Fig. 24
Mentions: Figure 24 displays the profiles of the focus-point strips in Fig. 23 (upper panels) and of the stop-coannihilation strips in Fig. 23 (lower panels), along their full lengths. Both pairs of profiles exhibit the values of calculated using SLHA files obtained using SSARD as inputs to FeynHiggs 2.10.0 (near-horizontal solid green lines), including uncertainty estimates of  GeV (near-horizontal dashed green lines). As already noted, only portions of the focus-point strips are compatible with the LHC measurement of (yellow bands) within these uncertainties, whereas in the cases of the stop-coannihilation strips there are significant additional uncertainties associated with the RGE running, and all portions of the strips are compatible with . In the cases of the stop-coannihilation strips in the lower panels of Fig. 24, we also display as blue lines the mass difference along the strips.15 In the examples shown, this mass difference is generally , so that the branching ratio for two-body decay usually dominates over that for four-body decay. However, this is not always the case, as illustrated by examples in [58] and by Fig. 25 for the stop-coannihilation strip with and . The branching ratio for decay may dominate when , as seen in the lower right panel of Fig. 24. Thus, a complete search for supersymmetry at FCC-hh should include searches for both the and the decay signatures.

Bottom Line: If supersymmetry is not discovered at the LHC, it is likely to lie somewhere along a focus-point, stop-coannihilation strip or direct-channel A / H resonance funnel.We discuss the prospects for discovering supersymmetry along these strips at a future circular proton-proton collider such as FCC-hh.Illustrative benchmark points on these strips indicate that also in this case FCC-ee could provide tests of the CMSSM at the loop level.

View Article: PubMed Central - PubMed

Affiliation: High Energy Physics Group, Blackett Lab., Imperial College, Prince Consort Road, London, SW7 2AZ UK.

ABSTRACT

We discuss the potential impacts on the CMSSM of future LHC runs and possible [Formula: see text] and higher-energy proton-proton colliders, considering searches for supersymmetry via  [Formula: see text] events, precision electroweak physics, Higgs measurements and dark matter searches. We validate and present estimates of the physics reach for exclusion or discovery of supersymmetry via [Formula: see text] searches at the LHC, which should cover the low-mass regions of the CMSSM parameter space favoured in a recent global analysis. As we illustrate with a low-mass benchmark point, a discovery would make possible accurate LHC measurements of sparticle masses using the MT2 variable, which could be combined with cross-section and other measurements to constrain the gluino, squark and stop masses and hence the soft supersymmetry-breaking parameters [Formula: see text] and [Formula: see text] of the CMSSM. Slepton measurements at CLIC would enable [Formula: see text] and [Formula: see text] to be determined with high precision. If supersymmetry is indeed discovered in the low-mass region, precision electroweak and Higgs measurements with a future circular [Formula: see text] collider (FCC-ee, also known as TLEP) combined with LHC measurements would provide tests of the CMSSM at the loop level. If supersymmetry is not discovered at the LHC, it is likely to lie somewhere along a focus-point, stop-coannihilation strip or direct-channel A / H resonance funnel. We discuss the prospects for discovering supersymmetry along these strips at a future circular proton-proton collider such as FCC-hh. Illustrative benchmark points on these strips indicate that also in this case FCC-ee could provide tests of the CMSSM at the loop level.

No MeSH data available.