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Search for dark matter produced in association with bottom or top quarks in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector

The collaboration
No Journal Information, 2017

Abstract (data abstract)
A search for weakly-interacting-massive-particle (WIMP) dark matter produced in association with bottom or top quarks is presented. Final states containing third generation quarks and missing transverse momentum are considered. The analysis uses 36.1 fb-1 of proton-proton collisions data recorded by the ATLAS experiment at sqrt(s)=13 TeV in 2015 and 2016. No significant deviation from the background prediction is observed. The results are interpreted in the framework of simplified models of spin-0 dark matter mediators. For colour-neutral spin-0 mediators decaying into a pair of dark matter particles, signals with scalar mediator masses below 50 GeV in top quark final states are excluded, assuming a dark matter mass of 1 GeV and unitary coupling. For bottom quark final states 300 times the value of the production cross section for signals with scalar and pseudoscalar mediator masses between 10 and 50 GeV are excluded, assuming a dark matter mass of 1 GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding to a dark matter relic density consistent with measurements.

• Table 1

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- - - - - - - - Overview of HEPData Record - - - - - - - -...

• Table 2

Data from Table 6

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Summary of the main systematic uncertainties and their impact on the total SM background prediction in each of the signal...

• Table 3

Data from Table 7

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Fit results in SRb1 and SRb2 for an integrated luminosity of $36.1 fb^{-1}$. The background normalisation parameters are obtained from...

• Table 4

Data from Table 8

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Fit results in SRt1, SRt2 and SRt3 for an integrated luminosity of $36.1 fb^{-1}$. The background normalisation parameters are obtained...

• Table 5

Data from Table 9

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95% CL upper limits on the visible cross-section ($\langle\epsilon\mathcal{A}\sigma\rangle^{\rm obs}_{95}$) and on the number of BSM events ($S^{\rm obs}_{95}$ )....

• Table 6

Data from Figure 4a

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Comparison of the data with the post-fit SM prediction of the $E_{\mathrm T}^{\mathrm{miss}}$ distribution in SRb1. The last bins include...

• Table 7

Data from Figure 4b

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Comparison of the data with the post-fit SM prediction of the $\cos{\theta}^*_{bb}$ distribution in SRb2. The last bins include overflows,...

• Table 8

Data from Figure 4c

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Comparison of the data with the post-fit SM prediction of the $m_{\mathrm T}^{\mathrm{b,min}}$ distribution in SRt1. The last bins include...

• Table 9

Data from Figure 4d

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Comparison of the data with the post-fit SM prediction of the $E_{\mathrm T}^{\mathrm{miss,sig}}$ distribution in SRt2. The last bins include...

• Table 10

Data from Figure 4e

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Comparison of the data with the post-fit SM prediction of the $\xi^{+}_{\ell\ell}$ distribution in SRt3. The last bins include overflows,...

• Table 11

Data from Figure 5a

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Expected exclusion limits for colour-neutral scalar model in the SRb2 as a function of the mediator mass for a DM...

• Table 12

Data from Figure 5a

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Observed exclusion limits for colour-neutral scalar model in SRb2 as a function of the mediator mass for a DM mass...

• Table 13

Data from Figure 5a

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Expected exclusion limits for colour-neutral scalar model in the SRt1/SRt2 as a function of the mediator mass for a DM...

• Table 14

Data from Figure 5a

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Observed exclusion limits for colour-neutral scalar model in SRt1/SRt2 as a function of the mediator mass for a DM mass...

• Table 15

Data from Figure 5a

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Expected exclusion limits for colour-neutral scalar model in SRt3 as a function of the mediator mass for a DM mass...

• Table 16

Data from Figure 5a

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Observed exclusion limits for colour-neutral scalar model in SRt3 as a function of the mediator mass for a DM mass...

• Table 17

Data from Figure 5b

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Expected exclusion limits for colour-neutral pseudo-scalar model in SRb2 as a function of the mediator mass for a DM mass...

• Table 18

Data from Figure 5b

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Observed exclusion limits for colour-neutral pseudo-scalar model in SRb2 as a function of the mediator mass for a DM mass...

• Table 19

Data from Figure 5b

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Expected exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the mediator mass for a DM mass...

• Table 20

Data from Figure 5b

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Observed exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the mediator mass for a DM mass...

• Table 21

Data from Figure 5b

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Expected limits for colour-neutral pseudo-scalar model in SRt3 as a function of the mediator mass for a DM mass of...

• Table 22

Data from Figure 5b

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Observed exclusion limits for colour-neutral pseudo-scalar model in SRt3 as a function of the mediator mass for a DM mass...

• Table 23

Data from Figure 6a

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Expected exclusion limits for colour-neutral scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

• Table 24

Data from Figure 6a

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Observed exclusion limits for colour-neutral scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

• Table 25

Data from Figure 6a

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Expected exclusion limits for colour-neutral scalar model in SRt3 as a function of the DM mass for a mediator mass...

• Table 26

Data from Figure 6a

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Observed exclusion limits for colour-neutral scalar model in SRt3 as a function of the DM mass for a mediator mass...

• Table 27

Data from Figure 6b

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Expected exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

• Table 28

Data from Figure 5a

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Observed exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

• Table 29

Data from Figure 6b

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Expected exclusion limits for colour-neutral pseudo-scalar model in SRt3 as a function of the DM mass for a mediator mass...

• Table 30

Data from Figure 6b

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Observed xclusion limits for colour-neutral pseudo-scalar model in SRt3 as a function of the DM mass for a mediator mass...

• Table 31

Data from Figure 7

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Comparison of the 90% CL limits on the spin-independent DM–nucleon cross-section versus mediator mass between these results and the direct-detection...

• Table 32

Data from Figure 8

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Expected exclusion limits for colour-charged scalar mediators ($b$-FDM) as a function of the mediator and DM masses for $36.1fb^{-1}$ of...

• Table 33

Data from Figure 8

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Exclusion observed limits for colour-charged scalar mediators ($b-$FDM) as a function of the mediator and DM masses for $36.1fb^{-1}$ of...

• Table 34

Data from Figure 11a

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Comparison of the data with the post-fit Monte Carlo prediction of sub leading jet $p_{T}$ in SRb1. The last bin...

• Table 35

Data from Figure 11b

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Comparison of the data with the post-fit Monte Carlo prediction of $H_{\mathrm T}^{ratio}$ distribution in SRb2. The last bin includes...

• Table 36

Data from Figure 11c

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Comparison of the data with the post-fit Monte Carlo prediction of $\Delta R_{bb}$ in SRt1. The last bin includes overflows....

• Table 37

Data from Figure 11d

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Comparison of the data with the post-fit Monte Carlo prediction of $M_{\mathrm T}^{b,min}$ in SRt2. The last bin includes overflows....

• Table 38

Data from Figure 11e

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Comparison of the data with the post-fit Monte Carlo prediction of $\Delta \phi_{boost}$ in SRt3. The last bin includes overflows....

• Table 39

Data from Table 19

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Acceptance of the SRb1 selection of the $b$-FDM model signal samples

• Table 40

Data from Table 19

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Efficiency of the SRb1 selection of the $b$-FDM model signal samples

• Table 41

Data from Table 20

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Acceptance of the SRb2 selection of the colour-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 42

Data from Table 21

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Efficiency of the SRb2 selection to the colour-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 43

Data from Table 22

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Efficiency of the SRb2 selection to the colour-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 44

Data from Table 23

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Acceptance of SRb2 selection to the colour-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced in...

• Table 45

Data from Table 24

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Acceptance of the SRt2 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 46

Data from Table 24

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Acceptance of the SRt1 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 47

Data from Table 24

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Efficiency of the SRt2 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 48

Data from Table 24

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Efficiency of the SRt1 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 49

Data from Table 25

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Acceptance of the SRt2 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 50

Data from Table 25

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Acceptance of the SRt1 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 51

Data from Table 25

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Efficiency of the SRt2 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 52

Data from Table 25

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Efficiency of the SRt1 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 53

Data from Table 26

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Acceptance of the SRt3 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 54

Data from Table 26

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Efficiency of the SRt3 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

• Table 55

Data from Table 27

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Acceptance of the SRt3 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 56

Data from Table 27

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Efficiency of the SRt3 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

• Table 57

Data from Table 28

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Number of signal events selected at different stages of the SRb1 selections for the $b$-FDM benchmark model $m(\phi_b,\chi)=(1000,35)$GeV

• Table 58

Data from Table 29

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Number of signal events selected at different stages of the SRb2 selections for the $b\bar{b} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV, $g=1$.

• Table 59

Data from Table 30

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Number of signal events selected at different stages of the SRt1 selections for the $t \bar{t} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

• Table 60

Data from Table 31

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Number of signal events selected at different stages of the SRt2 selections for the $t \bar{t} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

• Table 61

Data from Table 32

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Number of signal events selected at different stages of the SRt1 selections for the $t \bar{t} +a$ benchmark model $m(a,\chi)=(20,1)$GeV,...

• Table 62

Data from Table 33

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Number of signal events selected at different stages of the SRt2 selections for the $t \bar{t} +a$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

• Table 63

Data from Table 34

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Number of signal events selected at different stages of the SRt3 selections for the $t \bar{t} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...