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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 left panel compares current measurements of electroweak precision observables (EWPOs) taken from a Standard Model fit [118] (blue, with error bars), predictions at low- and high-mass best-fit points in the CMSSM [33] (red and purple symbols) and prospective FCC-ee (TLEP) experimental errors [65] (turquoise bars). The right panel compares prospective measurements of Higgs branching ratios at future colliders, low- and high-mass CMSSM predictions (red and purple symbols) and the current uncertainties within the Standard Model (turquoise bars)
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Fig14: The left panel compares current measurements of electroweak precision observables (EWPOs) taken from a Standard Model fit [118] (blue, with error bars), predictions at low- and high-mass best-fit points in the CMSSM [33] (red and purple symbols) and prospective FCC-ee (TLEP) experimental errors [65] (turquoise bars). The right panel compares prospective measurements of Higgs branching ratios at future colliders, low- and high-mass CMSSM predictions (red and purple symbols) and the current uncertainties within the Standard Model (turquoise bars)

Mentions: The left panel of Fig. 14 displays as blue points with error bars the central values and 1- uncertainties of several such observables, as calculated in a recent global fit [118], compared with their values and current individual experimental uncertainties in the Standard Model. Also shown (without theoretical uncertainties) are the values of these observables calculated at the representative low- and high-mass best-fit points in the CMSSM found in [33]. As is apparent from the left panel of Fig. 14 and the upper left panel of Fig. 15, the current experimental error in the measurement of is too large to provide much information about supersymmetric model parameters. The entire region of the CMSSM plane currently allowed at the 95 % CL according to the global fit [33] is compatible with the current measurement of at the 1- level [61]. However, also shown in the left panel of Fig. 14, as turquoise bars, are the prospective experimental errors in measurements at FCC-ee (TLEP) (neglecting theoretical uncertainties) [65], normalised relative to the current experimental errors. It is clear that, for and many other electroweak precision observables, the prospective FCC-ee (TLEP) uncertainties are sufficiently small to be very sensitive to deviations from their Standard Model values and capable of constraining supersymmetric scenarios.Fig. 15


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 left panel compares current measurements of electroweak precision observables (EWPOs) taken from a Standard Model fit [118] (blue, with error bars), predictions at low- and high-mass best-fit points in the CMSSM [33] (red and purple symbols) and prospective FCC-ee (TLEP) experimental errors [65] (turquoise bars). The right panel compares prospective measurements of Higgs branching ratios at future colliders, low- and high-mass CMSSM predictions (red and purple symbols) and the current uncertainties within the Standard Model (turquoise bars)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig14: The left panel compares current measurements of electroweak precision observables (EWPOs) taken from a Standard Model fit [118] (blue, with error bars), predictions at low- and high-mass best-fit points in the CMSSM [33] (red and purple symbols) and prospective FCC-ee (TLEP) experimental errors [65] (turquoise bars). The right panel compares prospective measurements of Higgs branching ratios at future colliders, low- and high-mass CMSSM predictions (red and purple symbols) and the current uncertainties within the Standard Model (turquoise bars)
Mentions: The left panel of Fig. 14 displays as blue points with error bars the central values and 1- uncertainties of several such observables, as calculated in a recent global fit [118], compared with their values and current individual experimental uncertainties in the Standard Model. Also shown (without theoretical uncertainties) are the values of these observables calculated at the representative low- and high-mass best-fit points in the CMSSM found in [33]. As is apparent from the left panel of Fig. 14 and the upper left panel of Fig. 15, the current experimental error in the measurement of is too large to provide much information about supersymmetric model parameters. The entire region of the CMSSM plane currently allowed at the 95 % CL according to the global fit [33] is compatible with the current measurement of at the 1- level [61]. However, also shown in the left panel of Fig. 14, as turquoise bars, are the prospective experimental errors in measurements at FCC-ee (TLEP) (neglecting theoretical uncertainties) [65], normalised relative to the current experimental errors. It is clear that, for and many other electroweak precision observables, the prospective FCC-ee (TLEP) uncertainties are sufficiently small to be very sensitive to deviations from their Standard Model values and capable of constraining supersymmetric scenarios.Fig. 15

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.