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| CMS-PAS-EXO-16-039 | ||
| Search for dark matter and graviton produced in association with a photon in pp collisions at $ \sqrt{s} = $ 13 TeV with an integrated luminosity of 12.9 fb$^{-1}$ | ||
| CMS Collaboration | ||
| August 2016 | ||
| Abstract: A search is conducted for dark matter pair-production and for graviton production predicted by the ADD large extra dimensions model in a final state with a photon and missing transverse energy in pp collisions at $\sqrt{s}=$ 13 TeV. Data taken by the CMS experiment in 2016 corresponding to an integrated luminosity of 12.9 fb$^{-1}$ is analyzed. A Poisson counting technique is used to assess a potential excess of events with respect to background, estimated through simulation and data-driven methods. No such excess is observed. The results of the searches are interpreted as exclusion limits in the model parameter spaces. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 10 (2017) 073. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Example diagrams of new-physics interactions that lead to a final state of $ {\gamma }$ and large missing transverse momentum. |
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Figure 1-a:
Example diagram of new-physics interactions that lead to a final state of $ {\gamma }$ and large missing transverse momentum. |
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Figure 1-b:
Example diagram of new-physics interactions that lead to a final state of $ {\gamma }$ and large missing transverse momentum. |
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Figure 1-c:
Example diagram of new-physics interactions that lead to a final state of $ {\gamma }$ and large missing transverse momentum. |
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Figure 2:
The ${p_{\mathrm {T}}^{ {\gamma }}}$ and ${E_{\mathrm {T}}}^{\text{miss}} $ distributions for the candidate sample, compared with estimated contributions from SM backgrounds. Systematic and statistical uncertainties on the background estimates are added in quadrature. |
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Figure 2-a:
The ${p_{\mathrm {T}}^{ {\gamma }}}$ distribution for the candidate sample, compared with estimated contributions from SM backgrounds. Systematic and statistical uncertainties on the background estimates are added in quadrature. |
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Figure 2-b:
The ${E_{\mathrm {T}}}^{\text{miss}} $ distributions for the candidate sample, compared with estimated contributions from SM backgrounds. Systematic and statistical uncertainties on the background estimates are added in quadrature. |
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Figure 3:
95% CL upper limits on $\mu = \sigma $/$\sigma _{\text {Theory}}$ in the ${M_{\text {med}}}- {m_{\text {DM}}}$ plane for vector and axial-vector mediator, assuming $g_{ {\mathrm {q}}}=$ 0.25 and $g_{\chi }=$ 1. Expected and observed exclusion contours are overlaid, where mass points to the lower left of the curves are excluded. |
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Figure 3-a:
95% CL upper limits on $\mu = \sigma $/$\sigma _{\text {Theory}}$ in the ${M_{\text {med}}}- {m_{\text {DM}}}$ plane for a vector mediator, assuming $g_{ {\mathrm {q}}}=$ 0.25 and $g_{\chi }=$ 1. Expected and observed exclusion contours are overlaid, where mass points to the lower left of the curves are excluded. |
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Figure 3-b:
95% CL upper limits on $\mu = \sigma $/$\sigma _{\text {Theory}}$ in the ${M_{\text {med}}}- {m_{\text {DM}}}$ plane for an axial-vector mediator, assuming $g_{ {\mathrm {q}}}=$ 0.25 and $g_{\chi }=$ 1. Expected and observed exclusion contours are overlaid, where mass points to the lower left of the curves are excluded. |
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Figure 4:
The 90% CL exclusion limits on the $\chi $-nucleon scattering cross section in a simplified model of dark matter production involving a vector and axial-vector operator as a function of the ${m_{\text {DM}}}$. The region to the upper left of the contour is excluded. Shown together are corresponding exclusion contours, where regions above the curves are excluded, from the recent results by CDMSLite [27], LUX [28], PandaX [29], CRESST-II [30], PICO-2L [31], PICO-60 [32], IceCube [33], and SuperKamiokande [34] collaborations. |
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Figure 4-a:
The 90% CL exclusion limits on the $\chi $-nucleon scattering cross section in a simplified model of dark matter production involving a vector operator as a function of the ${m_{\text {DM}}}$. The region to the upper left of the contour is excluded. Shown together are corresponding exclusion contours, where regions above the curves are excluded, from the recent results by CDMSLite [27], LUX [28], PandaX [29], CRESST-II [30], PICO-2L [31], PICO-60 [32], IceCube [33], and SuperKamiokande [34] collaborations. |
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Figure 4-b:
The 90% CL exclusion limits on the $\chi $-nucleon scattering cross section in a simplified model of dark matter production involving an axial-vector operator as a function of the ${m_{\text {DM}}}$. The region to the upper left of the contour is excluded. Shown together are corresponding exclusion contours, where regions above the curves are excluded, from the recent results by CDMSLite [27], LUX [28], PandaX [29], CRESST-II [30], PICO-2L [31], PICO-60 [32], IceCube [33], and SuperKamiokande [34] collaborations. |
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Figure 5:
The 95% CL expected and observed lower limits on $\Lambda $ for a dimension-7 operator EFT model with a contact interaction of type $\gamma \gamma \chi \overline {\chi }$ as a function of dark matter mass ${m_{\text {DM}}}$. |
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Figure 6:
The 95% CL upper limits on the ADD graviton production cross sections as a function of ${M_D}$ for $n=3$. |
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Figure 7:
Lower limit on ${M_D}$ as a function of $n$. |
| Tables | |
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Table 1:
Summary of estimated backgrounds and observed total number of candidates. Systematic and statistical uncertainties on the background estimates are added in quadrature. |
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Table 2:
Summary of relative systematic uncertainties (%) for different background estimates. |
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Table 3:
95% CL observed and expected lower limits on ${M_D}$ as a function of $n$. |
| Summary |
| Proton-proton collision events containing a photon and missing transverse momentum have been investigated to search for new phenomena. In the $ \sqrt{s} = $ 13 TeV data set corresponding to 12.9 fb$^{-1}$ of integrated luminosity, no deviations from the standard model predictions are observed. Upper limits are obtained on dark matter and ADD graviton production cross sections at 95% confidence level, which are then translated to limits on relevant parameters of the individual models. For the simplified dark matter production models considered, the search excludes mediator masses of up to 760 GeV for massless dark matter. For an effective dimension-7 photon-dark matter contact interaction, values of the suppression scale up to 620 GeV are excluded. For ADD extra dimensions, gravitational energy scale up to 2.44-2.60 TeV, depending on the number of extra dimensions, are excluded. |
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Compact Muon Solenoid LHC, CERN |
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