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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.


Simulations for 14-TeV collisions, using Pythia 8 [112, 113] and including Standard Model backgrounds, of the distributions in the MT2 variable for (upper panel) the nominal value of the gluino mass at the low-mass CMSSM best-fit point,  GeV (blue histogram), and gluino masses differing by  GeV (green and blue histograms), and similarly for (lower panel) the nominal value of the squark mass  GeV and values  GeV. In both cases, we fix the other sparticle masses to their nominal best-fit values, assuming in particular that the LSP mass  GeV. The inserts show the integrated luminosities at 14 TeV that would be required to distinguish at the 3- level between the best fit and other models with the indicated mass shifts
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Fig4: Simulations for 14-TeV collisions, using Pythia 8 [112, 113] and including Standard Model backgrounds, of the distributions in the MT2 variable for (upper panel) the nominal value of the gluino mass at the low-mass CMSSM best-fit point,  GeV (blue histogram), and gluino masses differing by  GeV (green and blue histograms), and similarly for (lower panel) the nominal value of the squark mass  GeV and values  GeV. In both cases, we fix the other sparticle masses to their nominal best-fit values, assuming in particular that the LSP mass  GeV. The inserts show the integrated luminosities at 14 TeV that would be required to distinguish at the 3- level between the best fit and other models with the indicated mass shifts

Mentions: Figure 4 displays prospective histograms of the MT2 distributions obtained from simulations using Pythia 8 [112, 113] and the MSTW2008NLO parton distribution functions [114] for different values of (upper panel), the right-handed squark mass (lower panel).7 In both cases, we compare the distribution for the nominal mass at the best-fit point with the corresponding distributions for values of the mass deviating from the nominal value by  GeV, keeping the other sparticle masses fixed. In the gluino case, we see that the MT2 histogram for the nominal value  GeV (in red) is very similar to that for the  GeV choice (in blue), whereas the histogram for the  GeV choice is less similar. The reverse is true for the squark case (middle panel): here the nominal histogram for  GeV (red) is more similar to that for the  GeV choice (green), and less similar to that for the  GeV case (blue).Fig. 5


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)

Simulations for 14-TeV collisions, using Pythia 8 [112, 113] and including Standard Model backgrounds, of the distributions in the MT2 variable for (upper panel) the nominal value of the gluino mass at the low-mass CMSSM best-fit point,  GeV (blue histogram), and gluino masses differing by  GeV (green and blue histograms), and similarly for (lower panel) the nominal value of the squark mass  GeV and values  GeV. In both cases, we fix the other sparticle masses to their nominal best-fit values, assuming in particular that the LSP mass  GeV. The inserts show the integrated luminosities at 14 TeV that would be required to distinguish at the 3- level between the best fit and other models with the indicated mass shifts
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig4: Simulations for 14-TeV collisions, using Pythia 8 [112, 113] and including Standard Model backgrounds, of the distributions in the MT2 variable for (upper panel) the nominal value of the gluino mass at the low-mass CMSSM best-fit point,  GeV (blue histogram), and gluino masses differing by  GeV (green and blue histograms), and similarly for (lower panel) the nominal value of the squark mass  GeV and values  GeV. In both cases, we fix the other sparticle masses to their nominal best-fit values, assuming in particular that the LSP mass  GeV. The inserts show the integrated luminosities at 14 TeV that would be required to distinguish at the 3- level between the best fit and other models with the indicated mass shifts
Mentions: Figure 4 displays prospective histograms of the MT2 distributions obtained from simulations using Pythia 8 [112, 113] and the MSTW2008NLO parton distribution functions [114] for different values of (upper panel), the right-handed squark mass (lower panel).7 In both cases, we compare the distribution for the nominal mass at the best-fit point with the corresponding distributions for values of the mass deviating from the nominal value by  GeV, keeping the other sparticle masses fixed. In the gluino case, we see that the MT2 histogram for the nominal value  GeV (in red) is very similar to that for the  GeV choice (in blue), whereas the histogram for the  GeV choice is less similar. The reverse is true for the squark case (middle panel): here the nominal histogram for  GeV (red) is more similar to that for the  GeV choice (green), and less similar to that for the  GeV case (blue).Fig. 5

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.