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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  functions for  (left panels) and  (right panels), as estimated from cross-section and MT2 measurements with 300/fb (upper panels) and 3000/fb (lower panels)
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Fig5: The functions for (left panels) and (right panels), as estimated from cross-section and MT2 measurements with 300/fb (upper panels) and 3000/fb (lower panels)

Mentions: In order to estimate the uncertainties in measurements of sparticle masses that could be possible at the LHC, we have performed fits to the simulated data for varying amounts of integrated luminosity. We use these to estimate the 68 % CL ranges of mass estimates obtainable with either 300 or 3000/fb of integrated luminosity. As seen in Fig. 4, the changes in the MT2 distributions for gluino and squark mass changes of  GeV are quite different, so we do not expect symmetric Gaussian uncertainties, and we note that the same is true for the projected cross-section measurements shown in Fig. 3. Combining these with the MT2 measurements, we find the distributions as functions of and shown in Fig. 5 in the left and right panels, respectively. The functions are evaluated as1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} \chi ^2 (m) \; = \; \frac{1}{n} \sum _{i = 1}^n \left( \frac{(N_i (m) - N_i (\hat{m}))^2}{\sigma _i^2} \right) , \end{aligned}$$\end{document}χ2(m)=1n∑i=1n(Ni(m)-Ni(m^))2σi2,where is the nominal mass, the are numbers of events in the simulation and is the statistical error in each bin for the assumed luminosity, and the sum over includes all the bins in the histograms added in quadrature. The upper row of panels is for 300/fb of integrated luminosity, and the lower row is for 3000/fb of integrated luminosity. On the basis of this analysis, we estimate the following fit uncertainties with 300/fb of data at 14 TeV:2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} 300/\mathrm{fb}: \; \; \Delta m_{\tilde{g}}= & {} (-270, + \cdots )~\mathrm{GeV} \, , \nonumber \\ \Delta m_{\tilde{q}_R}= & {} (-100, +110)~\mathrm{GeV}. \end{aligned}$$\end{document}300/fb:Δmg~=(-270,+⋯)GeV,Δmq~R=(-100,+110)GeV.where the indicate that these measurements provide no useful upper limit on , and with 3000/fb:3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} 3000/\mathrm{fb}: \; \; \Delta m_{\tilde{g}}= & {} (-110, +150)~\mathrm{GeV} \, , \nonumber \\ \Delta m_{\tilde{q}_R}= & {} (-30, +35)~\mathrm{GeV}. \end{aligned}$$\end{document}3000/fb:Δmg~=(-110,+150)GeV,Δmq~R=(-30,+35)GeV.These uncertainties do not include a potential systematic effect from jet energy scale uncertainties. However, as we expect these to be at the level of 10 % or below, their overall impact is expected to be subdominant.Fig. 6


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  functions for  (left panels) and  (right panels), as estimated from cross-section and MT2 measurements with 300/fb (upper panels) and 3000/fb (lower panels)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig5: The functions for (left panels) and (right panels), as estimated from cross-section and MT2 measurements with 300/fb (upper panels) and 3000/fb (lower panels)
Mentions: In order to estimate the uncertainties in measurements of sparticle masses that could be possible at the LHC, we have performed fits to the simulated data for varying amounts of integrated luminosity. We use these to estimate the 68 % CL ranges of mass estimates obtainable with either 300 or 3000/fb of integrated luminosity. As seen in Fig. 4, the changes in the MT2 distributions for gluino and squark mass changes of  GeV are quite different, so we do not expect symmetric Gaussian uncertainties, and we note that the same is true for the projected cross-section measurements shown in Fig. 3. Combining these with the MT2 measurements, we find the distributions as functions of and shown in Fig. 5 in the left and right panels, respectively. The functions are evaluated as1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} \chi ^2 (m) \; = \; \frac{1}{n} \sum _{i = 1}^n \left( \frac{(N_i (m) - N_i (\hat{m}))^2}{\sigma _i^2} \right) , \end{aligned}$$\end{document}χ2(m)=1n∑i=1n(Ni(m)-Ni(m^))2σi2,where is the nominal mass, the are numbers of events in the simulation and is the statistical error in each bin for the assumed luminosity, and the sum over includes all the bins in the histograms added in quadrature. The upper row of panels is for 300/fb of integrated luminosity, and the lower row is for 3000/fb of integrated luminosity. On the basis of this analysis, we estimate the following fit uncertainties with 300/fb of data at 14 TeV:2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} 300/\mathrm{fb}: \; \; \Delta m_{\tilde{g}}= & {} (-270, + \cdots )~\mathrm{GeV} \, , \nonumber \\ \Delta m_{\tilde{q}_R}= & {} (-100, +110)~\mathrm{GeV}. \end{aligned}$$\end{document}300/fb:Δmg~=(-270,+⋯)GeV,Δmq~R=(-100,+110)GeV.where the indicate that these measurements provide no useful upper limit on , and with 3000/fb:3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\begin{aligned} 3000/\mathrm{fb}: \; \; \Delta m_{\tilde{g}}= & {} (-110, +150)~\mathrm{GeV} \, , \nonumber \\ \Delta m_{\tilde{q}_R}= & {} (-30, +35)~\mathrm{GeV}. \end{aligned}$$\end{document}3000/fb:Δmg~=(-110,+150)GeV,Δmq~R=(-30,+35)GeV.These uncertainties do not include a potential systematic effect from jet energy scale uncertainties. However, as we expect these to be at the level of 10 % or below, their overall impact is expected to be subdominant.Fig. 6

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.